Date: Tue, 9 Oct 2012 17:10:18 +0800 From: Ganbold Tsagaankhuu <ganbold@gmail.com> To: Tim Kientzle <tim@kientzle.com> Cc: arm@freebsd.org, Oleksandr Tymoshenko <gonzo@freebsd.org> Subject: Re: Towards an ARM system-building script Message-ID: <CAGtf9xO%2Bz8JhCY-TirNwh-R_zW=hY%2BbPh-4x%2Bz3H0TQHu1aXAQ@mail.gmail.com> In-Reply-To: <8C1192B3-EC56-4D9E-824E-774700FB2EE9@kientzle.com> References: <DD05E72B9F474BFE96B6A4B050D2A18A@gmail.com> <0DCAC001-FF06-431A-A486-2B50BE913B0D@bsdimp.com> <FAA208C1-2872-4BB6-A7EC-04C757533CA4@kientzle.com> <7E18623F-3945-4EA0-B332-5A5C717B20F0@kientzle.com> <9896AA3E-D8A0-4CE8-8160-4672AA07388F@cheney.net> <6B74ADD7-3266-4919-BEB4-B10E0C1BAB58@kientzle.com> <5679C679-A434-4714-BE61-4DC093DA7F34@kientzle.com> <CAGtf9xPgFeDHMnKRacYfUg1BKJx0MjfmX=DWOc-X2NoJfPVB9Q@mail.gmail.com> <8C1192B3-EC56-4D9E-824E-774700FB2EE9@kientzle.com>
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On Tue, Oct 9, 2012 at 12:42 PM, Tim Kientzle <tim@kientzle.com> wrote: > > On Oct 8, 2012, at 9:07 PM, Ganbold Tsagaankhuu wrote: > >> On Mon, Sep 24, 2012 at 2:55 AM, Tim Kientzle <tim@kientzle.com> wrote: >>> On Sep 4, 2012, at 9:52 PM, Tim Kientzle wrote: >>>> On Sep 4, 2012, at 9:33 PM, Dave Cheney wrote: >>>> >>>>> Sorry to butt in on this discussion, but how feasible would it be to = adapt this build script to the pandaboard. I understand there may be a conf= ig in svn similar to the beaglebone which may be applicable. > >>> I've made significant progress and would >>> appreciate any feedback: >>> >>> github.com/kientzle/freebsd-beaglebone >>> >>> * PandaBoard: I have a completely untested >>> sketch. Someone with a PandaBoard will need >>> to work through the U-Boot configuration to make >>> this work. >> >> I tried your script on PandaBoard ES. >> Basically it works with some modifications/considerations: > > Wonderful! Thanks for trying it! > > Please send me any patches you used; I'll try > to incorporate them. > >> 1. PANDABOARD kernel config should be modified to use mmcsd card as root= . > > Would anyone object to adding this line to FreeBSD SVN? > > # Boot device is 2nd slice on MMC/SD card > options ROOTDEVNAME=3D\"ufs:mmcsd0s2\" > > >> 2. u-boot build complains about the board was configured to support THUM= B mode > > Hmmm=85 Not sure I understand this. > >> 3. Maybe there is need some more patches to have correct u-boot.bin, >> since it looks for uImage for instance > > There will certainly need to be some U-Boot patches. > > Perhaps Oleksandr can point us to the source he > used for that u-boot.bin? If so, I can help fill in > the options so it can correctly chain ubldr. > >> 4. I didn't dig into ubldr/u-boot much, instead modified uEnv.txt to >> load kernel.bin from first partition which is FAT. I tried 8MB of FAT. Progress, seems like ubldr is working after patching u-boot. Here are the patches, uEnv.txt etc: http://people.freebsd.org/~ganbold/pandaboard/ MLO is used from http://people.freebsd.org/~gonzo/pandaboard/ Ganbold >> 5. I used MLO, u-boot.bin from http://people.freebsd.org/~gonzo/pandaboa= rd/ >> >> So how does ubldr work? Can it load kernel.bin from second partition >> in case of PandaBoard? > > Yes, it can. At heart, ubldr is the same as the FreeBSD > loader(8) that's used for i386/amd64 booting. In particular, > it can load the kernel from UFS. > > The main difference between ubldr and loader(8) > is in how they access hardware: loader(8) uses > the PC BIOS and ubldr talks to U-Boot to do low-level > device access. > > I think ubldr makes a lot of sense for BeagleBone and > probably PandaBoard. I'm not sure it makes sense > for Raspberry Pi, though that's a different discussion. > > But ubldr requires that U-Boot be built with a few > non-standard options, so again we'll certainly have > to patch U-Boot to enable those options. > > > Tim >
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