From owner-freebsd-arm@freebsd.org Wed Sep 30 07:39:31 2015 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 7FEE9A0BDBE for ; Wed, 30 Sep 2015 07:39:31 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) Received: from kabab.cs.huji.ac.il (kabab.cs.huji.ac.il [132.65.116.210]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 0C5441439; Wed, 30 Sep 2015 07:39:30 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) Received: from chamsa.cs.huji.ac.il ([132.65.80.19]) by kabab.cs.huji.ac.il with esmtp id 1ZhBz1-000Cx1-NG; Wed, 30 Sep 2015 10:39:23 +0300 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Subject: Re: netboot configuration [was: Re: NFS Root with Raspberry Pi (nfs_diskless: no interface)] From: Daniel Braniss In-Reply-To: <1443542714.1224.445.camel@freebsd.org> Date: Wed, 30 Sep 2015 10:39:23 +0300 Cc: freebsd-arm@freebsd.org Message-Id: <7DBAE39E-55B2-4685-9C5E-2933B1DDFEF4@cs.huji.ac.il> References: <20150922052522.GA62140@gmail.com> <00C49FEB-E8EF-4469-85E2-0F901215CD11@cs.huji.ac.il> <20150923050414.GB43653@gmail.com> <91AAC64E-4C38-47AA-8910-48F7654A7524@cs.huji.ac.il> <20150923174445.GE43653@gmail.com> <1443105426.1224.272.camel@freebsd.org> <20150924163658.GC32257@gmail.com> <560438C5.3090404@selasky.org> <1443142468.1224.322.camel@freebsd.org> <1443209159.1224.361.camel@freebsd.org> <12C96F79-2D70-408D-AD4C-F06F6B909AD3@cs.huji.ac.il> <1443276119.1224.382.camel@freebsd.org> <33EFE756-B428-4A72-B3C5-0E764FA8ACC6@cs.huji.ac.il> <1443370490.1224.392.camel@freebsd.org> <1443371712.1224.398.camel@freebsd.org> <1443542714.1224.445.camel@freebsd.org> To: Ian Lepore X-Mailer: Apple Mail (2.2104) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.20 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2015 07:39:31 -0000 > On 29 Sep 2015, at 19:05, Ian Lepore wrote: >=20 > On Tue, 2015-09-29 at 12:24 +0300, Daniel Braniss wrote: >>> On 27 Sep 2015, at 19:35, Ian Lepore wrote: >>>=20 >>> On Sun, 2015-09-27 at 19:25 +0300, Daniel Braniss wrote: >>>>> On Sep 27, 2015, at 7:14 PM, Ian Lepore wrote: >>>>>=20 >>>>> On Sun, 2015-09-27 at 14:15 +0300, Daniel Braniss wrote: >>> [...] >>>>>> I compiled the u-boot-rpi from ports, >>>>>> the good news: >>>>>> it understands UserPreboot >>>>>> the bad news: >>>>>> the nfs boot gets stuck after a while. >>>>>>=20 >>>>>> after much trial and error, this is what I do: >>>>>> hit a key to enter U-Boot >>>>>> then type: >>>>>> setenv loaderdev net >>>>>> boot >>>>>>=20 >>>>>> attaching the console: >>>>>=20 >>>>> I was also experiencing intermittant lockups while loader loads = the >>>>> kernel. I just wrote it off to failing hardware (I powered my rpi = on >>>>> for the first time in 6-8 months to work on this), since I've = never had >>>>> a problem with netbooting before (it's the only way I've ever = booted the >>>>> rpi). If it's not just my board going bad, then that's a bit of a >>>>> mystery. The only other difference here from what I've always = done is >>>>> setting rootpath and other net config in u-boot instead of letting = ubldr >>>>> get it from dhcp. >>>>=20 >>>> with the stuff from crochet it works, same setup! I am sniffing the = net via >>>> wireshark, and it stops at different positions in the kernel file, >>>> so the settings of rootpath and other configs are irrelevant. >>>> the transfer is being done via udp/nfs/v3 (hence added ric :-) = maybe >>>> he can see something we don=C2=B4t. >>>=20 >>> Hmmm. What stuff from crochet? The two components that are in play >>> here are u-boot itself (it contains the low-level network drivers = that >>> ubldr uses -- it's effectively acting as a bios for ubldr), and = ubldr >>> which contains the higher-level network code. >>>=20 >>> In theory ubldr should be the same in both cases; nothing much has >>> changed in the loader code for months. But there are different = paths >>> through the code depending on how it gets the network parms, and I = could >>> easily have glitched something when I added the feature that lets = you >>> set the config with u-boot env vars. >>>=20 >>> The u-boot might be different between a crochet and ports build. = They >>> both start with gonzo's u-boot 2013.10 sources, but crochet probably = has >>> a slightly different set of patches it applies. >>>=20 >>> -- Ian >>>=20 >>=20 >> with the old uboot it boots ok, with the newer/modified it stops at = random >> places reading via udp/nfs/v3 the kernel. it loads correctly all the = *.4th files, >> then starts reading the kernel, and hangs after a random time. >>=20 >=20 > I have found that if I let u-boot get an ip address via dhcp then the > load of the kernel in ubldr never fails (I've had it reboot-looping = for > 24 hours now without a hang). But without letting u-boot do the dhcp > thing it hangs pretty much every time. Substituting a ping > for the dhcp isn't enough to make it reliable. >=20 > I've stopped debugging that whole mess for now to have a quick check > whether the very latest mainline u-boot (2015.10-rc4) is able to > netboot. It sure would be nice to use something modern that has = already > been debugged by others. :) there is definitely an issue with the net driver in the newer/ports = u-boot. - tftpboot sometimes works :-) - same with nfs =09 via dhcp: it should not try tftp load filename if none is supplied, i.e. = defaulting to .img is wrong! i got ubldr loaded via tftp and then bootelf got it running. the loaded kernel complained: No valid device tree blob found! I guess some of the environmet variables got lost my network is quiet busy, may be thats a factor? =09 >=20 >> on another issue, if I type dhcp instead of boot, it loads via TFTP = filename, >> which I set to ubldr/ubldr.bin, it loads and now prompts again, >> what should the command be? I tried go 0, go 20000, in which case = execs >> the old ubldr :-( >>=20 >=20 > The old ubldr had to be launched using 'bootelf', the new ubldr.bin = has > to be launched using "go ${loadaddr}". While we transition from old = to > new I've been using "dhcp && bootelf || go ${loadaddr}" = -- > if it's ubldr the bootelf command works; if bootelf fails it fails = back > to using go. >=20 > -- Ian