Date: Tue, 17 Mar 2015 12:34:19 -0600 From: Ian Lepore <ian@freebsd.org> To: Paul Mather <paul@gromit.dlib.vt.edu> Cc: Tim Kientzle <tim@kientzle.com>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: How to use u-boot-beaglebone port? Message-ID: <1426617259.62241.3.camel@freebsd.org> In-Reply-To: <F7EAB879-E70D-4ED5-8C5B-3B21FBED123A@gromit.dlib.vt.edu> References: <17B779D7-2962-4455-9062-51411F316648@gromit.dlib.vt.edu> <986F5E5D-C784-4BEF-81E3-49A9F27C0E8F@kientzle.com> <1426534773.95554.15.camel@freebsd.org> <F016BFCC-8CAA-4AE6-8142-40A9B69BD707@gromit.dlib.vt.edu> <1426607993.25614.9.camel@freebsd.org> <F7EAB879-E70D-4ED5-8C5B-3B21FBED123A@gromit.dlib.vt.edu>
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On Tue, 2015-03-17 at 14:21 -0400, Paul Mather wrote: > On Mar 17, 2015, at 11:59 AM, Ian Lepore <ian@freebsd.org> wrote: > > > On Tue, 2015-03-17 at 09:55 -0400, Paul Mather wrote: > >> On Mar 16, 2015, at 3:39 PM, Ian Lepore <ian@FreeBSD.org> wrote: > >> > >>> On Sun, 2015-03-15 at 19:57 -0700, Tim Kientzle wrote: > >>>>> On Mar 12, 2015, at 5:59 PM, Paul Mather <paul@gromit.dlib.vt.edu> wrote: > >>>>> > >>>>> Has anyone successfully used the sysutils/u-boot-beaglebone port? > >>>>> > >>>>> I managed to build [1] and install it today. I tried to install it to the SD card FAT partition, as per the README, and the result was an unbootable system. > >>>>> > >>>>> When I copied the u-boot.img file as u-boot.img (rather than the bb-uboot.img as suggested in the README), I got it to start up to the "U-Boot#" prompt. > >>>> > >>>> > >>>> Apparently, no one ever patched the port to use bb-uboot.img and bb-ubldr > >>>> as the name. > >>>> > >>>> I did this in Crochet when I was experimenting with having multiple > >>>> U-Boots on a single SD card image. That experiment was to try > >>>> to see what would be required to build single images that booted on > >>>> multiple different devices. > >>>> > >>> > >>> When I created the u-boot-beaglebone port I specifically removed that > >>> bb- prefix stuff, because there will never be a unified image that runs > >>> on both rpi and beaglebone [*]. I had hoped someone would update > >>> crochet to use the new ports and this is one of the minor changes that > >>> would be needed on the crochet side. > >>> > >>> -- Ian > >>> > >>> [*] Because armv6 != armv7 in this case. While armv6 is synonymous with > >>> armv7 for most purposes in freebsd, the rpi is the exception to that in > >>> that it really IS armv6, and that leads to the kernel being built with > >>> different cache maintenance routines that don't work on armv7. > >> > >> > >> Does the sysutils/u-boot-beaglebone boot the BeagleBone Black for you? As I reported earlier in the start to this thread, I can't get it to boot the system for me. > >> > >> I've copied MLO, u-boot.img, and /boot/ubldr to the FAT partition, but I just get to where U-Boot loads ubldr and then pauses before starting over again in a loop. > >> > >> Are there some other files that need to be copied to the FAT partition, or are those three files, plus the defaults compiled into u-boot.img sufficient to boot the BeagleBone Black from SD card? > >> > >> Cheers, > >> > >> Paul. > > > > Yep, it works for me on BBW and BBB. The only time I've seen a totally > > silent lockup like that is when the loadaddr variable in the uboot env > > didn't match the UBLDR_LOADADDR value when ubldr was compiled. For BB, > > those values are usually 0x88000000, iirc. If you do a "readelf -a > > ubldr" on your build system you should see a line like > > > > Entry point address: 0x88000074 > > > > and whatever it is should be your uboot loadaddr + 0x74. > > My current /boot/ubldr entry point address appears to be 0x1000074, which seems to be derived from the default set in /usr/src/sys/boot/arm/uboot/Makefile. > > What would I need to put in uEnv.txt to get such a ubldr to boot via the sysutils/u-boot-beaglebone port files? Would I just need to have the single line "loadaddr=1000000" in uEnv.txt, or would I have to reproduce the whole environment embedded into u-boot.img? (Do the settings in uEnv.txt replace entirely those in u-boot.img?) > > > You should only need MLO, u-boot.img, and ubldr on the fat partition. > > (There is an optional uEnv.txt that can be there, but it's not required > > to boot.) > > It looks like your supposition above is correct and a mis-matching loadaddr variable is likely to blame. > > Is a loadaddr of 0x1000000 correct for a BBB? > > Cheers, > > Paul. The address is a physical ram address, so you can't just make up any number -- there has to be actual ram at that address on the board, and the address must not conflict with where u-boot itself is loaded and where the kernel will be loaded. I think the BB ram starts at 0x80000000, so 0x10000000 won't work. The right fix would be to recompile ubldr with UBLDR_LOADADDR set to 0x88000000. -- Ian
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