Date: Tue, 9 Oct 2012 18:48:10 +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: <CAGtf9xNr9_Bh1Krw8rB1VkqKMx0eQBOC7SFuGkwS6GD8dHQdLw@mail.gmail.com> In-Reply-To: <CAGtf9xO%2Bz8JhCY-TirNwh-R_zW=hY%2BbPh-4x%2Bz3H0TQHu1aXAQ@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> <8C1192B3-EC56-4D9E-824E-774700FB2EE9@kientzle.com> <CAGtf9xO%2Bz8JhCY-TirNwh-R_zW=hY%2BbPh-4x%2Bz3H0TQHu1aXAQ@mail.gmail.com>
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On Tue, Oct 9, 2012 at 5:10 PM, Ganbold Tsagaankhuu <ganbold@gmail.com> wro= te: > 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 con= fig 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 roo= t. >> >> 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 THU= MB 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/ Strange, with ubldr Ethernet is not found, although kernel config is the same as before. Ganbold > > Ganbold > > > >>> 5. I used MLO, u-boot.bin from http://people.freebsd.org/~gonzo/pandabo= ard/ >>> >>> 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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