From nobody Wed Dec 20 22:12:46 2023 X-Original-To: freebsd-arm@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4SwSWF548qz55PY8 for ; Wed, 20 Dec 2023 22:13:29 +0000 (UTC) (envelope-from marietto2008@gmail.com) Received: from mail-ej1-x62e.google.com (mail-ej1-x62e.google.com [IPv6:2a00:1450:4864:20::62e]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4SwSWD4X4yz3XJg for ; Wed, 20 Dec 2023 22:13:28 +0000 (UTC) (envelope-from marietto2008@gmail.com) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20230601 header.b=QuorgpLj; spf=pass (mx1.freebsd.org: domain of marietto2008@gmail.com designates 2a00:1450:4864:20::62e as permitted sender) smtp.mailfrom=marietto2008@gmail.com; dmarc=pass (policy=none) header.from=gmail.com Received: by mail-ej1-x62e.google.com with SMTP id a640c23a62f3a-a2330a92ae6so17376566b.0 for ; Wed, 20 Dec 2023 14:13:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1703110404; x=1703715204; darn=freebsd.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=u1cmjSims7ukcf95xOKI4C2dpiBpFUlvQK1qY4BeDSI=; b=QuorgpLjfCfvaxPl7bRBBYT+krUdTeBciYLlcvFAdexuokUmGGiuK5hfn8AgDUSByT XOezfPoJaPXRPFl8q303ia/fURjtUevbPHcitA4gIhnhdckOhKhygdQS/RlOqiAMlMNy PK2uJvXh3FF/Fi3nOD1KcF6Ake76koKxBrYVvLBu8BefBbjlGa6RZK5hefvIa6XWxPcg VPMum7huNaVcM5Z52zQijjW7RNyssNx06vmnmzB8mRyWZk1FAhvoyYc4MZE3n186bOTP NPYFrTmYQ4LSsQfzqIn2PPqQ3pVxpvgSg3TL/5KoUXtqiuvI8J+Hff7BJIhYsX775Gk/ 36qg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703110404; x=1703715204; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=u1cmjSims7ukcf95xOKI4C2dpiBpFUlvQK1qY4BeDSI=; b=pFuLctSMgpVMHImZ4DRsSVLZSGR+1nw5mSev4IMiAHOgSbDiW9YzXm/kZLELqDnE0h AG0fc3FvNN0sFV5XYzmlVyaKj+Hg/DDAyfl6Lx6hiHfFDRG77p47lRRULqxfdte1y4z2 rEslihNZBQFvOlIppw2RQquEaFrS2A0z6+J9vMzn3iyJh2Jv7HyKfLj6ttO+0GEoMxo3 VvAyiyQxXR9tS0qS+kpRTkIgHBeH3yD2AMVinKrOklVwrAKiSUsv69a4o765S6eIUm3L +pBUxj1rSpEHuYKe08rFlCSSOhnawlWiLI3x76tV77pjfcYDloz28lI8z76mMbOvIKdx /3rw== X-Gm-Message-State: AOJu0YzQpgfAfsEFWEE93ue2+oDXGILAhkpXO1tJBoUWd9H4KxzSBgas a+mEulFM9O9WEyC9B3SKqM+15SOBfoiZdkH7sCo= X-Google-Smtp-Source: AGHT+IGQAkTjxT1xL9Th3aKUy/ADWmwI/SjYlx55sjKYD4xCvSGfQk3IqP+XiQjFXqp6bSPi4aYosey+ZNQ5P21ie64= X-Received: by 2002:a17:906:5502:b0:a23:3fa2:6a77 with SMTP id r2-20020a170906550200b00a233fa26a77mr2955216ejp.114.1703110404063; Wed, 20 Dec 2023 14:13:24 -0800 (PST) List-Id: Porting FreeBSD to ARM processors List-Archive: https://lists.freebsd.org/archives/freebsd-arm List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-arm@freebsd.org MIME-Version: 1.0 References: <97aa980b9b44.6eb7f9d5c54e7@mailgate.us> In-Reply-To: From: Mario Marietto Date: Wed, 20 Dec 2023 23:12:46 +0100 Message-ID: Subject: Re: How to boot FreeBSD for arm 32 bit as DomU with u-boot on my ARM Chromebook To: Stefano Stabellini Cc: Stanislav Silnicki , freebsd-arm@freebsd.org, Michal.Orzel@amd.com, xen-devel@lists.xenproject.org, Artem_Mygaiev@epam.com Content-Type: multipart/alternative; boundary="000000000000a5c902060cf84aa5" X-Spamd-Result: default: False [-4.00 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20230601]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::62e:from]; MLMMJ_DEST(0.00)[freebsd-arm@freebsd.org]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; MIME_TRACE(0.00)[0:+,1:+,2:~]; RCVD_COUNT_ONE(0.00)[1]; FROM_EQ_ENVFROM(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROMTLD(0.00)[]; RCVD_TLS_LAST(0.00)[]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; FREEMAIL_FROM(0.00)[gmail.com]; RCPT_COUNT_FIVE(0.00)[6]; PREVIOUSLY_DELIVERED(0.00)[freebsd-arm@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim] X-Rspamd-Queue-Id: 4SwSWD4X4yz3XJg X-Spamd-Bar: --- --000000000000a5c902060cf84aa5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello. maybe I'm using the wrong u-boot.bin file. Maybe I found the correct bootloader. It is not the u-boot.bin file,but maybe I can use it anyway,maybe I can convert it to u-boot.bin. Anyway,I'm reading the procedure used here : https://wiki.freebsd.org/arm/Chromebook this is the interesting part : Populating the U-Boot Partition # fetch http://commondatastorage.googleapis.com/chromeos-localmirror/distfi= les/nv_uboot-snow-simplefb.kpart.bz2# bunzip2 nv_uboot-snow-simplefb.kpart.bz2# dd if=3Dnv_uboot-snow-simplefb.kpart of=3D/dev/da0p1 bs=3D1m It seems that the file nv_uboot-snow-simplefb.kpart is able to boot FreeBSD. I tried to follow the tutorial,so I have dd'ed it on the first partition of my sd card : # dd if=3Dnv_uboot-snow-simplefb.kpart of=3D/dev/sdf1 bs=3D1m and then I tried to mount it because I hoped to find the u-boot.bin file inside the partition,but I haven't been able to mount it: $ sudo mount /dev/sdf1 /mnt/sdf1 mount: /mnt/sdf1: wrong fs type, bad option, bad superblock on /dev/sdf1, missing codepage or helper program, or other error. dmesg(1) may have more information after a failed mount system call. Is there a way to convert that kpart file into an u-boot.bin file ? I see that the source code to generate it is not there. Infact this website does not work : http://linux-exynos.org/dist/chromebook/nv_uboot/ On Tue, Dec 19, 2023 at 8:33=E2=80=AFPM Stefano Stabellini wrote: > +Michal > > Hi Mario, > > I am not sure about booting FreeBSD, but I am certain that u-boot works > fine as DomU kernel on ARMv8 (not sure about ARMv7). With this config > file: > > name=3D"test" > kernel=3D"u-boot.bin" > extra =3D "console=3Dhvc0" > memory=3D256 > vcpus=3D1 > disk =3D [ 'FreeBSD-13.2-RELEASE-armv7.img,raw,xvda' ] > > I don't know for sure if you can boot FreeBSD but you should definitely > be able to see the u-boot command line prompt. The fact that you are > getting this message: > > xc: error: panic: xg_dom_core.c:689: xc_dom_find_loader: no loader found: > Invalid kernel > > Means that something is not right in the u-boot configuration or u-boot > build. Michal and Artem (CCed) might know more. From what I recall, > there was nothing special required to get u-boot.bin to boot as domU > kernel, so now I wonder if it is an ARMv7 vs. ARMv8 issue. > > Cheers, > > Stefano > > > On Tue, 19 Dec 2023, Mario Marietto wrote: > > ....I see that some other interesting files have been produced by u-boo= t > when I have compiled it : > > > > u-boot > > u-boot.lds > > u-boot.bin > > u-boot.map > > u-boot-nodtb.bin > > u-boot.dtb > > u-boot.srec > > u-boot-dtb.bin > > u-boot.sym > > > > So,maybe I should use a different u-boot* file for booting FreeBSD ? > > > > > > On Tue, Dec 19, 2023 at 4:28=E2=80=AFPM Mario Marietto > wrote: > > Hello to everyone. > > > > I have compiled the needed u-boot.bin from scratch using this procedure= : > > > > # git clone https://github.com/u-boot/u-boot.git > > # cd u-boot > > # ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- make snow_defconfig := this > line generates the file .config > > # nano .config and I've added these parameters : > > > > CONFIG_ARMV7_NONSEC=3Dn > > CONFIG_EFI_GRUB_ARM32_WORKAROUND=3Dy > > > > the uboot-bin file is generated with this command : > > > > # ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- make > > > > At this point,I took a look inside the .config file and I saw that the > parameter "CONFIG_ARMV7_NONSEC=3Dn" has been removed. So,for > > some reason,it is not accepted and this could be a problem.... > > > > These are the xen config files that I've used : > > > > nano freebsd.cfg > > > > name=3D"test" > > kernel=3D"u-boot.bin" > > extra =3D "console=3Dhvc0" > > memory=3D256 > > vcpus=3D1 > > disk =3D [ 'FreeBSD-13.2-RELEASE-armv7.img,raw,xvda' ] > > > > nano start-freebsd > > > > xl create freebsd.cfg > > xl console freebsd > > > > This is what happens when I launch the vm : > > > > # ./start-freebsd > > > > Parsing config from freebsd.cfg > > xc: error: panic: xg_dom_core.c:689: xc_dom_find_loader: no loader > found: Invalid kernel > > libxl: error: libxl_dom.c:571:libxl__build_dom: xc_dom_parse_image fail= ed > > libxl: error: libxl_create.c:1640:domcreate_rebuild_done: Domain > 1:cannot (re-)build domain: -3 > > libxl: error: libxl_domain.c:1183:libxl__destroy_domid: Domain > 1:Non-existent domain > > libxl: error: libxl_domain.c:1137:domain_destroy_callback: Domain > 1:Unable to destroy guest > > libxl: error: libxl_domain.c:1064:domain_destroy_cb: Domain > 1:Destruction of domain failed > > freebsd is an invalid domain identifier (rc=3D-6) > > > > > > On Mon, Dec 18, 2023 at 12:39=E2=80=AFPM Mario Marietto > wrote: > > So,ok,I should have said "the second u-boot" ; since the first > u-boot binary is the "u-boot binary located in the RO > > memory" of the Chromebook". Sorry for the confusion. > > > > On Mon, Dec 18, 2023 at 12:35=E2=80=AFPM Mario Marietto > wrote: > > ---> There are no specific options in u-boot devoted to FreeBSD > > > > This is an important factor. So,what about if,instead of compiling a ne= w > version of u-boot on the partition 2,I will > > recompile the u-boot customized version created by the virtual open > system in 2014,that should be installed on the first > > partition ? It could work if there are no differences between the u-boo= t > that should boot Linux and the u-boot that > > should boot FreeBSD. > > > > Can you give a look at the u-boot source code created by virtual open > systems ? You can find it on my google drive : > > > > > https://drive.google.com/file/d/1eAaZMfd6CU0xiqQfH7sq5wGVzzO09BRm/view?us= p=3Dsharing > > > > I need to understand if I can recompile it without problem so that it > can satisfy my needs (the ability of the file > > u-boot.bin to boot FreeBSD as domU under Xen,as explained by Stefano > Stabellini,the xen developer that suggested to me > > what I could do to have FreeBSD virtualized under Xen on my Arm > Chromebook) ; otherwise the risk is to find later > > problems that will make me troubles and that I will not able to fix. > > > > I gave a look at the virtual open system u-boot and I didn't see any > arndale_defconfig inside. So,If I have understood > > correctly,I should put that file inside the root of the u-boot source > code,let's say here : > > > > marietto:/home/marietto/Desktop/Files/u-boot_FreeBSD/u-boot-vos # ls > > > > .checkpatch.conf README doc > net > > .git api drivers > onenand_ipl > > .gitignore arch dts > post > > COPYING board examples > rules.mk > > CREDITS boards.cfg fs > scripts > > MAINTAINERS common include > snapshot.commit > > MAKEALL config.mk lib > spl > > Makefile cros mkconfig > test > > PRESUBMIT.cfg disk nand_spl > tools > > > > and I should do : make and make install ? and the file I need,u-boot.bi= n > will be generated ? > > > > I didn't find any pre made configuration file inside : > > > > u-boot-vos # find . -type f -name "exynos*" > > > > ./include/exynos-fb.h > > ./include/configs/exynos5-common.h > > ./doc/device-tree-bindings/spi/exynos-spi.txt > > ./doc/device-tree-bindings/usb/exynos-usb.txt > > ./drivers/power/exynos-tmu.c > > ./drivers/power/exynos-cpufreq.c > > ./drivers/video/exynos-fb.c > > ./drivers/spi/exynos_spi.c > > ./board/samsung/dts/exynos5250-spring.dts > > ./board/samsung/dts/exynos5250-smdk5250.dts > > ./board/samsung/dts/exynos5250-snow.dts > > ./board/samsung/dts/exynos5250-daisy.dts > > ./arch/arm/include/asm/arch-exynos5/exynos-cpufreq.h > > ./arch/arm/include/asm/arch-exynos5/exynos-tmu.h > > ./arch/arm/dts/exynos5250.dtsi > > ./arch/arm/dts/exynos-periph-id.dtsi > > ./arch/arm/cpu/armv7/exynos5/exynos_cache.c > > > > u-boot-vos # find . -type f -name "arndale*" > > > > For sure I can't use a newer version of u-boot because otherwise the > patches needed to bypass the bootloader protections > > of the Arm Chromebook (such as a lot of different patches needed to boo= t > correctly Linux) will be broken ; anyway,since > > it works,I don't need to use an updated version of u-boot. > > > > ----> As per my experience, you have to respect these two options, > compiling u-boot for > > FreeBSD: > https://github.com/freebsd/freebsd-ports/blob/main/sysutils/u-boot-master= /files/FreeBSD_Fragment > > > > It says that I should use these parameters : > > > > CONFIG_ARMV7_NONSEC=3Dn > > CONFIG_EFI_GRUB_ARM32_WORKAROUND=3Dy > > > > These are the parameters used to configure a Linux kernel. I don't > understand what's the relation between the compilation > > of a linux kernel and u-boot. In the past I tried to recompile > u-boot,but I didn't have the need to set up those > > parameters,so I don't know how to do it (but I know how to recompile a > Linux kernel). > > > > ---> I'm not sure that I'm getting you right, as I don't understand wha= t > you mean under "the first u-boot". > > > > > > I'm talking about first u-boot because the whole procedure to boot Linu= x > on the ARM Chromebook,that's explained here : > > > > http://www.virtualopensystems.com/en/solutions/guides/kvm-on-chromebook= / > > > > > > at some point they say : > > > > > > To be able to run KVM on ARM platforms, the kernel has to be booted in > hypervisor mode. Because of this relatively recent > > requirement (due to the introduction of the virtualization extensions), > up until now all booting methods would boot the > > kernel in the standard Supervisor mode. > > > > For the ARM Chromebook the default boot procedure doesn't allow us to > boot in hypervisor mode. Although the laptop's boot > > mechanism is based on the frequently used u-boot, the binary is located > in RO memory. Fortunately, a chained u-boot > > mechanism can be used (i.e. starting another u-boot after the original)= . > We can then enter hypervisor mode from our > > custom iteration of u-boot and subsequently load our kernel and > userspace. > > > > So,the first u-boot is the u-boot provided by virtual open > systems,that's able to chainload the "u-boot binary located in > > RO memory" , that does not boot Chrome OS in hypervisor mode. We don't > need it if we want to boot Linux with kvm or xen > > enabled. > > > > > > On Sun, Dec 17, 2023 at 1:28=E2=80=AFAM Stanislav Silnicki < > stanislav.silnicki@mailgate.us> wrote: > > I'm not an expert in the topic, I only know, that ARM has divided > hardware into two worlds - Secure and > > Not-So, strictly limiting any software, running in non-secure > world with access to functions and > > resources. > https://developer.arm.com/documentation/den0013/d/Security/TrustZone-hard= ware-architecture?lang=3Den > > > > I'm not sure, that I'm getting you right, as I don't understand what yo= u > mean under "the first u-boot". > > > > As I understand, virtualization (HYP) is running in non-secure world( > https://developer.arm.com/documentation/ddi0406/c/System-Level-Architectu= re/The-System-Level-Programmers--Model/The-Virtualization-Extens > > ions), so my guess (only guess!!!), virtualization software has to > prepare (configure) HW platform in the way, > > that FreeBSD kernel will not lack any resources, required to configure > MPU, VA, etc. > > So, if you lucky to boot virtualizer, which is aware of target OS, that > maybe you can boot the kernel. Although, I > > doubt, that you need to boot 'second' u-boot to boot the kernel - there > is simply ubldr, which you can hook somehow > > from virtualizer.... > > > > Stan > > > > > > > > Mario Marietto wrote: > > > > > > ---> As I understand, it makes sure that u-boot keeps in secure > mode during boot and passes control to > > ubldr, which boots FreeBSD kernel, in that mode. > > > > Can you elaborate your sentence more ? I know that the bootloader secur= e > mode is bypassed by the virtual open > > systems u-boot. Are you saying that when the control passes to the > second u-boot,it will happen in secure > > mode,so that the bypass that happened loading the first u-boot,is > annulled ? If this is true,maybe can I boot > > FreeBSD using the virtual-open-system custom u-boot ? Is this compatibl= e > with FreeBSD ? Where can I find the > > u-boot.bin that the xen developer talked about ? thanks bro'. > > > > > > > > On Sun, Dec 17, 2023 at 12:35=E2=80=AFAM Stanislav Silnicki < > stanislav.silnicki@mailgate.us> wrote: > > Hi Mario, > > > > U-Boot beast is hiding in this den: > https://source.denx.de/u-boot/u-boot.git > > I took a brief look at your post and it seems to me, that > option CONFIG_CMO_BY_VA_ONLY is irrelevant to > > your target armv7 32 bit > > platform: > https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/cpu/armv8/Kco= nfig?ref_type=3Dheads#L3 > > > > As for compiling the u-boot, it is a doable task, given that you > understand what you are doing. There > > are no specific options in u-boot devoted to FreeBSD. It is a boot > loader, whose mission to make basic > > hardware initialization, read you kernel file from some media into RAM > and then pass it control. > > > > Basically, you can grab some defconfig, prepared for any other > Exynos5250 based board (say, this one: > > > https://source.denx.de/u-boot/u-boot/-/blob/master/configs/arndale_defcon= fig?ref_type=3Dheads) > and adopt > > it somehow. > > > > As per my experience, you have to respect these two options, compiling > u-boot for > > FreeBSD: > https://github.com/freebsd/freebsd-ports/blob/main/sysutils/u-boot-master= /files/FreeBSD_Fragment > > > > As I understand, it makes sure, that u-boot keeps in secure mode during > boot and passes control to > > ubldr, which boots FreBSD kernel, in that mode. Otherwise, there a lot > of surprises you may realize. > > > > Hope, this will help to progress you tasks > > Stan > > > > Mario Marietto wrote: > > > > > > Hello. > > > > I'm trying to boot FreeBSD for arm32 bit as DomU on my ARM > Chromebook. Basically there are > > two ways to accomplish this task : > > > > 1) to write a patch that allows the FreeBSD kernel to boot as a > zImage file. This could be > > accomplished applying this patch to a specific file that's on the > source code of FreeBSD : > > > > > > > https://xenbits.xen.org/gitweb/?p=3Dp...8;hb=3D0782e25d98cc1391472717035f= 986c979edef0c9 > > > > > > This patch was written by Julien Grall a lot of time ago and now > it does not work anymore. > > This is the reason : > > > > > > It appears FreeBSD-CURRENT removed the last step converting > the kernel file to > > kernel.bin. The patch can be readily rebased, but without > kernel.bin that > > doesn't do too much. > > > > > > > > So,without a rebase of that patch the first option is not applicable. > And I'm not able to fix it. > > > > 2) booting FreeBSD using U-Boot,as explained to me by a xen developer : > > > > > > I was trying to explain why and how Julien's patch works so that > you could be the one > > to re-do something similar or fix the patch on the FreeBSD kernel > that you are > > working with. I am happy to help review and write patches but I > don't work with the > > FreeBSD kernel so I wouldn't be able to help you quickly. However= , > I might have a > > suggestion. Do you know if FreeBSD can be booted by U-Boot ? > Because U-Boot > > definitely boots as Xen on ARM guest firmware/bootloader. You > should be able to build > > U-Boot and use the U-Boot binary as Xen guest kernel, then U-Boot > could load FreeBSD > > from disk or network and start it. For instance as domU config > file: > > > > kernel=3D"/home/petalinux/u-boot.bin" > > disk =3D [ '/home/petalinux/test.img,raw,xvda' ] > > > > I know it is important to build u-boot with the following config > to make it work on > > Xen. > > > > CONFIG_CMO_BY_VA_ONLY=3Dy > > > > > > > > This option seems more doable to me according to my knowledge. But I > need to understand how to do > > it. > > > > Well,let's say that on the ARM Chromebook I'm forced to use and install > a customized version of > > u-boot,created by virtual open systems,because it is the only one that > allows bypassing its > > bootloader protection. You can find more information here : > > > > > http://www.virtualopensystems.com/en/solutions/guides/kvm-on-chromebook/?= vos=3Dtech > > > > This is the relevant section to read : > > > > > > Bootloader : > > > > If you wish to skip this chapter you can download a pre-compiled > binary of the > > bootloader: > > > > > > $ wget > > > http://www.virtualopensystems.com/downloads/guides/kvm_on_chromebook/nv_u= -boot-snow.kpart > > > > > > To be able to run KVM on ARM platforms, the kernel has to be > booted in hypervisor > > mode. Because of this relatively recent requirement (due to the > introduction of the > > virtualization extensions), up until now all booting methods woul= d > boot the kernel in > > the standard Supervisor mode. For the ARM Chromebook the default > boot procedure > > doesn't allow us to boot in hypervisor mode. Although the laptop'= s > boot mechanism is > > based on the frequently used u-boot, the binary is located in RO > memory. Fortunately, > > a chained u-boot mechanism can be used (i.e. starting another > u-boot after the > > original). We can then enter hypervisor mode from our custom > iteration of u-boot and > > subsequently load our kernel and userspace. > > > > Checkout the needed u-boot code : > > > > > > $ git clone git://github.com/virtualopensystems/u-boot.git$ cd > u-boot$ > > ./scripts/build.sh > > > > > > If successful, a message about how to copy the bootloader on the > USB flash disk or SD > > card will appear. We will use it later when preparing the boot > medium to start our > > system. If you have followed the Setting up the boot medium > chapter and you have a > > prepared boot device, then you can update u-boot by running : > > > > > > $ sudo dd if=3Dnv_uboot-snow.kpart of=3D/dev/sdX1 > > > > > > > > so,the needed u-boot that we must use should be installed on the first > partition of the sd card. > > > > There is another relevant section to read : > > > > > > Setting up the boot medium > > > > Now it is time to copy all the relevant files that we created in > the previous > > chapters,and use them to boot Chromebook with a different kernel > and OS. In all these > > examples the device /dev/sdX is used. Take extra care to change > the examples to the > > device that you have attached. Insert the boot medium on your > workstation and > > carefully execute the following step. First we need to properly > format the boot > > medium. > > > > In the uboot source directory : > > > > > > $ sudo ./scripts/sdcard.sh /dev/sdX > > > > > > This will erase all data and create 4 partitions in the medium, > along with copying > > the u-boot binary to the first partition: > > > > > > Partition 1 =3D ChromeOS signed binary (V.O.S chained u-boot) > > Partition 2 =3D not used > > Partition 3 =3D EXT2 partition for u-boot files (uImage and > exynos5250-snow.dtb) > > Partition 4 =3D EXT4 partition for userspace files > > > > > > With u-boot being copied, next is the kernel image and DTB file. > From the kernel > > source execute : > > > > > > $ mkdir ../mnt/ > > $ sudo mount /dev/sdX3 ../mnt/ > > $ sudo cp arch/arm/boot/uImage ../mnt/ > > $ sudo cp arch/arm/boot/dts/exynos5250-snow.dtb ../mnt/ > > $ sudo umount /dev/sdX3 > > > > > > Finally, we have to copy the Ubuntu userspace filesystem that we > created earlier: > > > > > > $ sudo mount /dev/sdX4 mnt/$ sudo cp -a ./precise/* mnt/$ sudo > umount /dev/sdX4 > > > > > > > > Now,my idea is to chainload the already chain loaded u-boot created by > V.O.S to the new u-boot > > that we need for booting FreeBSD and that can be installed in the > partition n.2,as shown in this > > scheme,because it is not used : > > > > > > Partition 1 =3D ChromeOS signed binary (V.O.S chained u-boot) > > Partition 2 =3D not used (maybe we can install the u-boot for arm 32 > bit,compatible with FreeBSD on > > this partition) > > Partition 3 =3D EXT2 partition for u-boot files (uImage and > exynos5250-snow.dtb) > > Partition 4 =3D EXT4 partition for userspace files > > > > > > Take in consideration that default boot string is hardcoded here,in the > snow.h file of the custom > > u-boot created by VOS : > > > > > > > https://github.com/virtualopensyste...18a39b6c177dff58a/include/configs/s= now.h#L101 > > > > > > and it needs to be recompiled because it should point to the partition > n.2,where I will install > > the u-boot files as explained here : > > > > > > https://wiki.freebsd.org/arm/Chromebook > > > > > > I have some questions to ask before I start working on this. > > > > 1) The xen developer said : > > > > > > You should be able to build U-Boot and use the U-Boot binary as > Xen guest kernel... > > > > > > > > where is the u-boot binary,according to this document ? > > > > https://wiki.freebsd.org/arm/Chromebook > > > > I don't see it. > > > > > > 2) where is the source code of the file that I can get here : > > > > > http://commondatastorage.googleapis.com/chromeos-localmirror/distfiles/nv= _uboot-snow-simplefb.kpart.bz2 > > > > I need the source code if I want to recompile u-boot so that it can > point to the partition 4. > > > > Maybe it can be found on this link : > > > > http://linux-exynos.org/dist/chromebook/nv_uboot/ > > > > but it can't be opened.... > > > > > > 3) in this specific scenario the source code of u-boot should run on ar= m > 32 bit,not on arm > > 64,because I have the Samsung Chromebook "SNOW" model XE303C12,that's > powered by a Samsung Exynos > > 5250 (ARMv7 32 bit Cortex A15) Soc. > > > > > > 4) I'm not sure if I can chainload the customized u-boot created by > V.O.S that should be > > installed on the first partition with the u-boot tailored for booting > FreeBSD that should be > > installed on the partition 2.... > > > > > > 5) the xen developer said that u-boot should be compiled enabling this > option : > > > > > > Code: > > > > CONFIG_CMO_BY_VA_ONLY=3Dy > > > > > > Well,can you provide some good source that can help me to understand ho= w > I can recompile u-boot > > for FreeBSD ? thanks. > > > > -- > > Mario. > > > > > > > > -- > > Mario. > > > > > > > > -- > > Mario. > > > > > > > > -- > > Mario. > > > > > > > > -- > > Mario. > > > > > > > > -- > > Mario. > > > > --=20 Mario. --000000000000a5c902060cf84aa5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello.

maybe I'm using t= he wrong u-boot.bin file. Maybe I found the correct bootloader. It is not t= he u-boot.bin file,but maybe I can use it anyway,maybe I can convert it to = u-boot.bin. Anyway,I'm reading the procedure used here :
=

this is the in= teresting part :

Populating the U-Boot Partition

# fetch http://commondatastorage.googleapis.com/= chromeos-localmirror/distfiles/nv_uboot-snow-simplefb.kpart.bz2 # bunzip2 nv_uboo= t-snow-simplefb.kpart.bz2 # dd if=3Dnv_uboo= t-snow-simplefb.kpart of=3D/dev/da0p1 bs=3D1m


It seem=
s that the file nv_uboot-snow-simplefb.kpart is able to boot FreeBSD. I tri=
ed to follow the tutorial,so I have dd'ed it 
on the first partition=
 of my sd card :

=
# dd if=3Dnv_uboot-snow-simplefb.kpart of=3D/dev/sdf1 bs=3D1m
and then I tried to mount it because I hoped to find the u-boot=
.bin file inside the partition,but I haven't been able to mount it:
=

$ sudo mount /dev/sdf1 /mnt/sdf1

mount: /mnt/sdf1: wrong fs type, bad option, bad superblock on /=
dev/sdf1, missing codepage or helper program, or other error.
dmesg(1) may have more information after a failed mount system call.

Is there a way to convert that kpart file into an u-b=
oot.bin file ? I see that the source code to generate it is not there. 
=

Infact this website does not work : http://linux-exynos.org/dist/chromebook/nv_uboot=
/

=
On Tue, Dec 19, 2023 at 8:33=E2=80=AF= PM Stefano Stabellini <sstabel= lini@kernel.org> wrote:
+Michal

Hi Mario,

I am not sure about booting FreeBSD, but I am certain that u-boot works
fine as DomU kernel on ARMv8 (not sure about ARMv7). With this config
file:

name=3D"test"
kernel=3D"u-boot.bin"
extra =3D "console=3Dhvc0"
memory=3D256
vcpus=3D1
disk =3D [ 'FreeBSD-13.2-RELEASE-armv7.img,raw,xvda' ]

I don't know for sure if you can boot FreeBSD but you should definitely=
be able to see the u-boot command line prompt. The fact that you are
getting this message:

xc: error: panic: xg_dom_core.c:689: xc_dom_find_loader: no loader found: I= nvalid kernel

Means that something is not right in the u-boot configuration or u-boot
build. Michal and Artem (CCed) might know more. From what I recall,
there was nothing special required to get u-boot.bin to boot as domU
kernel, so now I wonder if it is an ARMv7 vs. ARMv8 issue.

Cheers,

Stefano


On Tue, 19 Dec 2023, Mario Marietto wrote:
> ....I see that some other interesting files have been produced by u-bo= ot when I have compiled it :
>
> u-boot
> u-boot.lds
> u-boot.bin
> u-boot.map
> u-boot-nodtb.bin
> u-boot.dtb
> u-boot.srec
> u-boot-dtb.bin
> u-boot.sym
>
> So,maybe I should use a different u-boot* file for booting FreeBSD ? >
>
> On Tue, Dec 19, 2023 at 4:28=E2=80=AFPM Mario Marietto <marietto2008@gmail.com= > wrote:
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Hello to everyone.
>
> I have compiled the needed u-boot.bin from scratch using this procedur= e :
>
> # git clone https://github.com/u-boot/u-boot.git
> # cd u-boot
> # ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- make snow_defconfig = : this line generates the file .config
> # nano .config and I've added these parameters :
>
> CONFIG_ARMV7_NONSEC=3Dn
> CONFIG_EFI_GRUB_ARM32_WORKAROUND=3Dy
>
> the uboot-bin file is generated with this command :
>
> # ARCH=3Darm CROSS_COMPILE=3Darm-linux-gnueabihf- make
>
> At this point,I took a look inside the .config file and I saw that the= parameter "CONFIG_ARMV7_NONSEC=3Dn" has been removed. So,for
> some reason,it is not accepted and this could be a problem....
>
> These are the xen config files that I've used :
>
> nano freebsd.cfg
>
> name=3D"test"
> kernel=3D"u-boot.bin"
> extra =3D "console=3Dhvc0"
> memory=3D256
> vcpus=3D1
> disk =3D [ 'FreeBSD-13.2-RELEASE-armv7.img,raw,xvda' ]
>
> nano start-freebsd
>
> xl create freebsd.cfg
> xl console freebsd
>
> This is what happens when I launch the vm :
>
> # ./start-freebsd
> =C2=A0
> Parsing config from freebsd.cfg
> xc: error: panic: xg_dom_core.c:689: xc_dom_find_loader: no loader fou= nd: Invalid kernel
> libxl: error: libxl_dom.c:571:libxl__build_dom: xc_dom_parse_image fai= led
> libxl: error: libxl_create.c:1640:domcreate_rebuild_done: Domain 1:can= not (re-)build domain: -3
> libxl: error: libxl_domain.c:1183:libxl__destroy_domid: Domain 1:Non-e= xistent domain
> libxl: error: libxl_domain.c:1137:domain_destroy_callback: Domain 1:Un= able to destroy guest
> libxl: error: libxl_domain.c:1064:domain_destroy_cb: Domain 1:Destruct= ion of domain failed
> freebsd is an invalid domain identifier (rc=3D-6)
>
>
> On Mon, Dec 18, 2023 at 12:39=E2=80=AFPM Mario Marietto <marietto2008@gmail.com> wrote:
>=C2=A0 =C2=A0 =C2=A0 =C2=A0So,ok,I should have said "the second u-= boot" ; since the first u-boot binary is the "u-boot binary locat= ed in the RO
>=C2=A0 =C2=A0 =C2=A0 =C2=A0memory" of the Chromebook". Sorry = for the confusion.
>
> On Mon, Dec 18, 2023 at 12:35=E2=80=AFPM Mario Marietto <marietto2008@gmail.com> wrote:
>=C2=A0 =C2=A0 =C2=A0 =C2=A0---> There are no specific options in u-b= oot devoted to FreeBSD
>
> This is an important factor. So,what about if,instead of compiling a n= ew version of u-boot on the partition 2,I will
> recompile the u-boot customized version created by the virtual open sy= stem in 2014,that should be installed on the first
> partition ? It could work if there are no differences between the u-bo= ot that should boot Linux and the u-boot that
> should boot FreeBSD.
>
> Can you give a look at the u-boot source code created by virtual open = systems ? You can find it on my google drive :
>
> https://dri= ve.google.com/file/d/1eAaZMfd6CU0xiqQfH7sq5wGVzzO09BRm/view?usp=3Dsharing
>
> I need to understand if I can recompile it without problem so that it = can satisfy my needs (the ability of the file
> u-boot.bin to boot FreeBSD as domU under Xen,as explained by Stefano S= tabellini,the xen developer that suggested to me
> what I could do to have FreeBSD virtualized under Xen on my Arm Chrome= book) ; otherwise the risk is to find later
> problems that will make me troubles and that I will not able to fix. >
> I gave a look at the virtual open system u-boot and I didn't see a= ny arndale_defconfig inside. So,If I have understood
> correctly,I should put that file inside the root of the u-boot source = code,let's say here :
>
> marietto:/home/marietto/Desktop/Files/u-boot_FreeBSD/u-boot-vos # ls > =C2=A0
> .checkpatch.conf =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0README =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0doc =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= net
> .git =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0api =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0drivers =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0onenand_ipl
> .gitignore =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0arch =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0dts =C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0post
> COPYING =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0board =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= examples =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0rules.mk
> CREDITS =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0boards.cfg =C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0fs =C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0scripts
> MAINTAINERS =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0common =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0include =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0snapshot.commit
> MAKEALL =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0config.mk =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0lib =C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0spl
> Makefile =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0cros =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= mkconfig =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0test
> PRESUBMIT.cfg =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0disk =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0nand_spl =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= tools
>
> and I should do : make and make install ? and the file I need,u-boot.b= in will be generated ?=C2=A0
>
> I didn't find any pre made configuration file inside :
>
> u-boot-vos # find . -type f -name "exynos*"=C2=A0
>
> ./include/exynos-fb.h
> ./include/configs/exynos5-common.h
> ./doc/device-tree-bindings/spi/exynos-spi.txt
> ./doc/device-tree-bindings/usb/exynos-usb.txt
> ./drivers/power/exynos-tmu.c
> ./drivers/power/exynos-cpufreq.c
> ./drivers/video/exynos-fb.c
> ./drivers/spi/exynos_spi.c
> ./board/samsung/dts/exynos5250-spring.dts
> ./board/samsung/dts/exynos5250-smdk5250.dts
> ./board/samsung/dts/exynos5250-snow.dts
> ./board/samsung/dts/exynos5250-daisy.dts
> ./arch/arm/include/asm/arch-exynos5/exynos-cpufreq.h
> ./arch/arm/include/asm/arch-exynos5/exynos-tmu.h
> ./arch/arm/dts/exynos5250.dtsi
> ./arch/arm/dts/exynos-periph-id.dtsi
> ./arch/arm/cpu/armv7/exynos5/exynos_cache.c=C2=A0
>
> u-boot-vos # find . -type f -name "arndale*"
>
> For sure I can't use a newer version of u-boot because otherwise t= he patches needed to bypass the bootloader protections
> of the Arm Chromebook (such as a lot of different patches needed to bo= ot correctly Linux) will be broken ; anyway,since
> it works,I don't need to use an updated version of u-boot.
>
> ----> As per my experience, you have to respect these two options, = compiling u-boot for
> FreeBSD:=C2=A0https://github.com/freebsd/freebsd-ports/blob/main/sysutils/= u-boot-master/files/FreeBSD_Fragment
>
> It says that I should use these parameters :
>
> CONFIG_ARMV7_NONSEC=3Dn
> CONFIG_EFI_GRUB_ARM32_WORKAROUND=3Dy
>
> These are the parameters used to configure a Linux kernel. I don't= understand what's the relation between the compilation
> of a linux kernel and u-boot. In the past I tried to recompile u-boot,= but I didn't have the need to set up those
> parameters,so I don't know how to do it (but I know how to recompi= le a Linux kernel).
>
> ---> I'm not sure that I'm getting you right, as I don'= t understand what you mean under "the first u-boot".
>
>
> I'm talking about first u-boot because the whole procedure to boot= Linux on the ARM Chromebook,that's explained here :
>
> http://www.virtualopens= ystems.com/en/solutions/guides/kvm-on-chromebook/
>
>
> at some point they say :
>
>
> To be able to run KVM on ARM platforms, the kernel has to be booted in= hypervisor mode. Because of this relatively recent
> requirement (due to the introduction of the virtualization extensions)= , up until now all booting methods would boot the
> kernel in the standard Supervisor mode.
>
> For the ARM Chromebook the default boot procedure doesn't allow us= to boot in hypervisor mode. Although the laptop's boot
> mechanism is based on the frequently used u-boot, the binary is locate= d in RO memory. Fortunately, a chained u-boot
> mechanism can be used (i.e. starting another u-boot after the original= ). We can then enter hypervisor mode from our
> custom iteration of u-boot and subsequently load our kernel and usersp= ace.
>
> So,the first u-boot is the u-boot provided by virtual open systems,tha= t's able to chainload the "u-boot binary located in
> RO memory" , that does not boot Chrome OS in hypervisor mode. We = don't need it if we want to boot Linux with kvm or xen
> enabled.
>
>
> On Sun, Dec 17, 2023 at 1:28=E2=80=AFAM Stanislav Silnicki <stanislav.siln= icki@mailgate.us> wrote:
>=C2=A0 =C2=A0 =C2=A0 =C2=A0I'm not an expert in the topic, I only k= now, that ARM has divided hardware into two worlds - Secure and
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Not-So, strictly limiting any software, runn= ing in non-secure world with access to functions and
>=C2=A0 =C2=A0 =C2=A0 =C2=A0resources.=C2=A0https://developer.arm.com/do= cumentation/den0013/d/Security/TrustZone-hardware-architecture?lang=3Den
>
> I'm not sure, that I'm getting you right, as I don't under= stand what you mean under "the first u-boot".
>
> As I understand, virtualization (HYP) is running in non-secure world(<= a href=3D"https://developer.arm.com/documentation/ddi0406/c/System-Level-Ar= chitecture/The-System-Level-Programmers--Model/The-Virtualization-Extens" r= el=3D"noreferrer" target=3D"_blank">https://developer.arm.com/documentation= /ddi0406/c/System-Level-Architecture/The-System-Level-Programmers--Model/Th= e-Virtualization-Extens
> ions), so my guess (only guess!!!), virtualization software has to pre= pare (configure) HW platform in the way,
> that FreeBSD kernel will not lack any resources, required to configure= MPU, VA, etc.
> So, if you lucky to boot virtualizer, which is aware of target OS, tha= t maybe you can boot the kernel. Although, I
> doubt, that you need to boot 'second' u-boot to boot the kerne= l - there is simply ubldr, which you can hook somehow
> from virtualizer....
>
> Stan
>
>
>
> Mario Marietto wrote:
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0---> As I understand, it makes sure that = u-boot keeps in secure mode during boot and passes control to
>=C2=A0 =C2=A0 =C2=A0 =C2=A0ubldr, which boots FreeBSD kernel, in that m= ode.
>
> Can you elaborate your sentence more ? I know that the bootloader secu= re mode is bypassed by the virtual open
> systems u-boot. Are you saying that when the control passes to the sec= ond u-boot,it will happen in secure
> mode,so that the bypass that happened loading the first u-boot,is annu= lled ? If this is true,maybe can I boot
> FreeBSD using the virtual-open-system custom u-boot ? Is this compatib= le with FreeBSD ? Where can I find the
> u-boot.bin that the xen developer talked about ? thanks bro'.
>
>
>
> On Sun, Dec 17, 2023 at 12:35=E2=80=AFAM Stanislav Silnicki <stanislav.sil= nicki@mailgate.us> wrote:
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Mario,
>
> U-Boot=C2=A0 beast is hiding in this den: https://sourc= e.denx.de/u-boot/u-boot.git
> I took a brief look at your post and it seems to me, that option=C2=A0= CONFIG_CMO_BY_VA_ONLY=C2=A0is irrelevant to
> your target armv7 32 bit
> platform:=C2=A0https://source.denx.de/u-boot/u-boot/-/blob/master/arch/ar= m/cpu/armv8/Kconfig?ref_type=3Dheads#L3
>
> As for compiling the u-boot, it is a doable task, given that you under= stand what you are doing. There
> are no specific options in u-boot devoted to FreeBSD. It is a boot loa= der, whose mission to make basic
> hardware initialization, read you kernel file from some media into RAM= and then pass it control.
>
> Basically, you can grab some defconfig, prepared for any other Exynos5= 250 based board=C2=A0 (say, this one:
> ht= tps://source.denx.de/u-boot/u-boot/-/blob/master/configs/arndale_defconfig?= ref_type=3Dheads) and adopt
> it somehow.
>
> As per my experience, you have to respect these two options, compiling= u-boot for
> FreeBSD:=C2=A0https://github.com/freebsd/freebsd-ports/blob/main/sysutils/= u-boot-master/files/FreeBSD_Fragment
>
> As I understand, it makes sure, that u-boot keeps in secure mode durin= g boot and passes control to
> ubldr, which boots FreBSD kernel, in that mode. Otherwise, there a lot= of surprises you may realize.
>
> Hope, this will help to progress you tasks
> Stan
>
> Mario Marietto wrote:
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Hello.
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0I'm trying to boot FreeBSD for arm32 bit= as DomU on my ARM Chromebook. Basically there are
>=C2=A0 =C2=A0 =C2=A0 =C2=A0two ways to accomplish this task :
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A01) to write a patch that allows the FreeBSD = kernel to boot as a zImage file. This could be
>=C2=A0 =C2=A0 =C2=A0 =C2=A0accomplished applying this patch to a specif= ic file that's on the source code of FreeBSD :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0https://xenbits.xen.org/gitweb/?p=3Dp...8;hb=3D0782e25d98= cc1391472717035f986c979edef0c9
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0This patch was written by Julien Grall a lot= of time ago and now it does not work anymore.
>=C2=A0 =C2=A0 =C2=A0 =C2=A0This is the reason :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0It appears FreeBSD-CURR= ENT removed the last step converting the kernel file to
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0kernel.bin. The patch c= an be readily rebased, but without kernel.bin that
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0doesn't do too much= .
>
>
>
> So,without a rebase of that patch the first option is not applicable. = And I'm not able to fix it.
>
> 2) booting FreeBSD using U-Boot,as explained to me by a xen developer = :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0I was trying to explain why and how Julien&#= 39;s patch works so that you could be the one
>=C2=A0 =C2=A0 =C2=A0 =C2=A0to re-do something similar or fix the patch = on the FreeBSD kernel that you are
>=C2=A0 =C2=A0 =C2=A0 =C2=A0working with. I am happy to help review and = write patches but I don't work with the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0FreeBSD kernel so I wouldn't be able to = help you quickly. However, I might have a
>=C2=A0 =C2=A0 =C2=A0 =C2=A0suggestion. Do you know if FreeBSD can be bo= oted by U-Boot ? Because U-Boot
>=C2=A0 =C2=A0 =C2=A0 =C2=A0definitely boots as Xen on ARM guest firmwar= e/bootloader. You should be able to build
>=C2=A0 =C2=A0 =C2=A0 =C2=A0U-Boot and use the U-Boot binary as Xen gues= t kernel, then U-Boot could load FreeBSD
>=C2=A0 =C2=A0 =C2=A0 =C2=A0from disk or network and start it. For insta= nce as domU config file:
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0kernel=3D"/home/petalinux/u-boot.bin&qu= ot;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0disk =3D [ '/home/petalinux/test.img,raw= ,xvda' ]
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0I know it is important to build u-boot with = the following config to make it work on
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Xen.
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0CONFIG_CMO_BY_VA_ONLY=3Dy
>
>
>
> This option seems more doable to me according to my knowledge. But I n= eed to understand how to do
> it.
>
> Well,let's say that on the ARM Chromebook I'm forced to use an= d install a customized version of
> u-boot,created by virtual open systems,because it is the only one that= allows bypassing its
> bootloader protection. You can find more information here :
>
> http://www.v= irtualopensystems.com/en/solutions/guides/kvm-on-chromebook/?vos=3Dtech=
>
> This is the relevant section to read :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Bootloader :
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0If you wish to skip this chapter you can dow= nload a pre-compiled binary of the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0bootloader:
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ wget
>=C2=A0 =C2=A0 =C2=A0 =C2=A0http://www.virtualopensystems.com/downloads/guides/kvm_= on_chromebook/nv_u-boot-snow.kpart
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0To be able to run KVM on ARM platforms, the = kernel has to be booted in hypervisor
>=C2=A0 =C2=A0 =C2=A0 =C2=A0mode. Because of this relatively recent requ= irement (due to the introduction of the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0virtualization extensions), up until now all= booting methods would boot the kernel in
>=C2=A0 =C2=A0 =C2=A0 =C2=A0the standard Supervisor mode. For the ARM Ch= romebook the default boot procedure
>=C2=A0 =C2=A0 =C2=A0 =C2=A0doesn't allow us to boot in hypervisor m= ode. Although the laptop's boot mechanism is
>=C2=A0 =C2=A0 =C2=A0 =C2=A0based on the frequently used u-boot, the bin= ary is located in RO memory. Fortunately,
>=C2=A0 =C2=A0 =C2=A0 =C2=A0a chained u-boot mechanism can be used (i.e.= starting another u-boot after the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0original). We can then enter hypervisor mode= from our custom iteration of u-boot and
>=C2=A0 =C2=A0 =C2=A0 =C2=A0subsequently load our kernel and userspace.<= br> >
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Checkout the needed u-boot code :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ git clone git://git= hub.com/virtualopensystems/u-boot.git$ cd u-boot$
>=C2=A0 =C2=A0 =C2=A0 =C2=A0./scripts/build.sh
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0If successful, a message about how to copy t= he bootloader on the USB flash disk or SD
>=C2=A0 =C2=A0 =C2=A0 =C2=A0card will appear. We will use it later when = preparing the boot medium to start our
>=C2=A0 =C2=A0 =C2=A0 =C2=A0system. If you have followed the Setting up = the boot medium chapter and you have a
>=C2=A0 =C2=A0 =C2=A0 =C2=A0prepared boot device, then you can update u-= boot by running :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo dd if=3Dnv_uboot-snow.kpart of=3D/dev= /sdX1
>
>
>
> so,the needed u-boot that we must use should be installed on the first= partition of the sd card.
>
> There is another relevant section to read :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Setting up the boot medium
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Now it is time to copy all the relevant file= s that we created in the previous
>=C2=A0 =C2=A0 =C2=A0 =C2=A0chapters,and use them to boot Chromebook wit= h a different kernel and OS. In all these
>=C2=A0 =C2=A0 =C2=A0 =C2=A0examples the device /dev/sdX is used. Take e= xtra care to change the examples to the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0device that you have attached. Insert the bo= ot medium on your workstation and
>=C2=A0 =C2=A0 =C2=A0 =C2=A0carefully execute the following step. First = we need to properly format the boot
>=C2=A0 =C2=A0 =C2=A0 =C2=A0medium.
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0In the uboot source directory :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo ./scripts/sdcard.sh /dev/sdX
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0This will erase all data and create 4 partit= ions in the medium, along with copying
>=C2=A0 =C2=A0 =C2=A0 =C2=A0the u-boot binary to the first partition: >
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Partition 1 =3D ChromeOS signed binary (V.O.= S chained u-boot)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Partition 2 =3D not used
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Partition 3 =3D EXT2 partition for u-boot fi= les (uImage and exynos5250-snow.dtb)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Partition 4 =3D EXT4 partition for userspace= files
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0With u-boot being copied, next is the kernel= image and DTB file. From the kernel
>=C2=A0 =C2=A0 =C2=A0 =C2=A0source execute :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ mkdir ../mnt/
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo mount /dev/sdX3 ../mnt/
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo cp arch/arm/boot/uImage ../mnt/
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo cp arch/arm/boot/dts/exynos5250-snow.= dtb ../mnt/
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo umount /dev/sdX3
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Finally, we have to copy the Ubuntu userspac= e filesystem that we created earlier:
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0$ sudo mount /dev/sdX4 mnt/$ sudo cp -a ./pr= ecise/* mnt/$ sudo umount /dev/sdX4
>
>
>
> Now,my idea is to chainload the already chain loaded u-boot created by= V.O.S to the new u-boot
> that we need for booting FreeBSD and that can be installed in the part= ition n.2,as shown in this
> scheme,because it is not used :
>
>
> Partition 1 =3D ChromeOS signed binary (V.O.S chained u-boot)
> Partition 2 =3D not used (maybe we can install the u-boot for arm 32 b= it,compatible with FreeBSD on
> this partition)
> Partition 3 =3D EXT2 partition for u-boot files (uImage and exynos5250= -snow.dtb)
> Partition 4 =3D EXT4 partition for userspace files
>
>
> Take in consideration that default boot string is hardcoded here,in th= e snow.h file of the custom
> u-boot created by VOS :
>
>
> https://gith= ub.com/virtualopensyste...18a39b6c177dff58a/include/configs/snow.h#L101=
>
>
> and it needs to be recompiled because it should point to the partition= n.2,where I will install
> the u-boot files as explained here :
>
>
> https://wiki.freebsd.org/arm/Chromebook
>
>
> I have some questions to ask before I start working on this.
>
> 1) The xen developer said :
>
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0You should be able to build U-Boot and use t= he U-Boot binary as Xen guest kernel...
>
>
>
> where is the u-boot binary,according to this document ?
>
> https://wiki.freebsd.org/arm/Chromebook
>
> I don't see it.
>
>
> 2) where is the source code of the file that I can get here :
>
> http://commondatastorage.googleapis.com/chromeos-localmirror/distfi= les/nv_uboot-snow-simplefb.kpart.bz2
>
> I need the source code if I want to recompile u-boot so that it can po= int to the partition 4.
>
> Maybe it can be found on this link :
>
> http://linux-exynos.org/dist/chromebook/nv_ubo= ot/
>
> but it can't be opened....
>
>
> 3) in this specific scenario the source code of u-boot should run on a= rm 32 bit,not on arm
> 64,because I have the Samsung Chromebook "SNOW" model XE303C= 12,that's powered by a Samsung Exynos
> 5250 (ARMv7 32 bit Cortex A15) Soc.
>
>
> 4) I'm not sure if I can chainload the customized u-boot created b= y V.O.S that should be
> installed on the first partition with the u-boot tailored for booting = FreeBSD that should be
> installed on the partition 2....
>
>
> 5) the xen developer said that u-boot should be compiled enabling this= option :
>
>
> Code:
>
> CONFIG_CMO_BY_VA_ONLY=3Dy
>
>
> Well,can you provide some good source that can help me to understand h= ow I can recompile u-boot
> for FreeBSD ? thanks.
>
> --
> Mario.
>
>
>
> --
> Mario.
>
>
>
> --
> Mario.
>
>
>
> --
> Mario.
>
>
>
> --
> Mario.
>
>
>
> --
> Mario.
>
>


--
Mario.
--000000000000a5c902060cf84aa5--