Date: Mon, 8 Oct 2012 21:42:21 -0700 From: Tim Kientzle <tim@kientzle.com> To: Ganbold Tsagaankhuu <ganbold@gmail.com> Cc: arm@freebsd.org, Oleksandr Tymoshenko <gonzo@freebsd.org> Subject: Re: Towards an ARM system-building script Message-ID: <8C1192B3-EC56-4D9E-824E-774700FB2EE9@kientzle.com> In-Reply-To: <CAGtf9xPgFeDHMnKRacYfUg1BKJx0MjfmX=DWOc-X2NoJfPVB9Q@mail.gmail.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>
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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: >>>=20 >>>> 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 config in svn similar to the beaglebone which may be applicable. >> I've made significant progress and would >> appreciate any feedback: >>=20 >> github.com/kientzle/freebsd-beaglebone >>=20 >> * PandaBoard: I have a completely untested >> sketch. Someone with a PandaBoard will need >> to work through the U-Boot configuration to make >> this work. >=20 > 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 = THUMB 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. > 5. I used MLO, u-boot.bin from = http://people.freebsd.org/~gonzo/pandaboard/ >=20 > 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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