[Buildroot] BeagleBone defconfig broken?

[Stephan Hoffmann <sho@relinux.de>]

Am 19.08.2013 19:57, schrieb Ivan Sergeev:
> Also, are you building the kernel through buildroot, or using the
> latest patched one here? https://github.com/beagleboard/kernel/tree/3.8
> I would try that patched kernel a try, if you aren't using it already.
Hello Ivan,

I'll check this out when I've got some time. I used the buildroot
default config and only changed the option to copy kernel and dts to
/boot in the root filesystem.

So u-boot and kernel are both built by buildroot. Kernel comed from ti:
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git and u-boot is
version 2013.04, boardname am335x_evm.

> Maybe it'd be worth double checking that the bootargs in u-boot has
> the right rootfstype?
> The dts doesn't specify them so I'm assuming they're being passed
> entirely by u-boot.
>

I checked this, but the kernel does not come to the point where it sees
any filesystem.

Regards

Stephan
>
> Thanks,
> ~vsergeev
> Ivan Sergeev
>
>
> On Mon, Aug 19, 2013 at 10:54 AM, Ivan Sergeev <vsergeev@gmail.com
> <mailto:vsergeev@gmail.com>> wrote:
>
>     Hello Stephan,
>
>     Maybe it'd be worth double checking that the bootargs in u-boot
>     has the right rootfstype?
>     The dts doesn't specify them so I'm assuming they're being passed
>     entirely by u-boot.
>
>     Thanks,
>     ~vsergeev
>     Ivan Sergeev
>
>
>     On Mon, Aug 19, 2013 at 1:17 AM, Stephan Hoffmann <sho@relinux.de
>     <mailto:sho@relinux.de>> wrote:
>
>         Am 18.08.2013 19:48, schrieb Ivan Sergeev:
>>         Hi Stephan,
>         Hello Ivan,
>
>         thank you for your reply.
>>
>>         Does u-boot report that the device tree is loaded into memory
>>         just before booting?
>         Yes, that is obviously the case:
>>         2857712 bytes read in 435 ms (6.3 MiB/s)
>>         10537 bytes read in 55 ms (186.5 KiB/s)
>>         Booting from mmc ...
>>         ## Booting kernel from Legacy Image at 80200000 ...
>>            Image Name:   Linux-3.8.11
>>            Image Type:   ARM Linux Kernel Image (uncompressed)
>>            Data Size:    2857648 Bytes = 2.7 MiB
>>            Load Address: 80008000
>>            Entry Point:  80008000
>>            Verifying Checksum ... OK
>>         ## Flattened Device Tree blob at 80f80000
>>            Booting using the fdt blob at 0x80f80000
>>            Loading Kernel Image ... OK
>>         OK
>>            Using Device Tree in place at 80f80000, end 80f85928
>>
>>         Starting kernel ...
>
>>         It should be named /boot/am335x-bone.dtb or
>>         /boot/am335x-boneblack.dtb on your rootfs partition,
>>         depending on if your BeagleBone hardware platform is White or
>>         Black, for u-boot to autoload it without further assistance
>>         in a uEnv.txt... The defaults are
>>         in buildroot/output/build/uboot-2013.04/include/configs/am335x_evm.h.
>         I tried the white one. Obviously the right files are loaded,
>         at least the sizes match:
>>         ls -l output/target/boot/
>>         insgesamt 2804
>>         -rw-rw-r-- 1 stephan users   10537 2013-08-19 09:47
>>         am335x-bone.dtb
>>         -rw-r--r-- 1 stephan users 2857712 2013-08-19 09:47 uImage
>         I also verified the filenames in u-boot.
>
>         But the kernel still fails to mount root:
>>         [    1.509906] Waiting for root device /dev/mmcblk0p2...
>         is the last sign of life it gives.
>
>         BTW: I changed the config by adding
>         BR2_LINUX_KERNEL_INSTALL_TARGET=y, which is obviously missing
>         in beaglebone_defconfig.
>
>         Any further idea?
>
>         Kind regards
>
>         Stephan
>
>>
>>         Thanks,
>>         ~vsergeev
>>         Ivan Sergeev
>>
>>
>>         On Fri, Aug 16, 2013 at 1:23 AM, Stephan Hoffmann
>>         <sho at relinux.de <mailto:sho@relinux.de>> wrote:
>>
>>             Hello all,
>>
>>             I am currently trying to get the latest buildroot to run
>>             on my
>>             beaglebone with little success. The last version that
>>             seem to run out of
>>             the box is 2012.08, where I can simply copy MLO,
>>             u-boot.img and uImage
>>             to the boot partition, dd rootfs.ext2 to the second
>>             partition and the
>>             system works.
>>
>>             The current build fails to boot, because u-boot expects
>>             the image and
>>             dts in /boot within the root filesystem. After putting
>>             them there with a
>>             post build script, u-boot starts the kernel, but the
>>             kernel fails to
>>             mount root:
>>             > [    1.509962] Waiting for root device /dev/mmcblk0p2...
>>             The SD partitions seem o.k.:
>>             > Disk /dev/sdi: 3965 MB, 3965190144 bytes
>>             > 255 heads, 63 sectors/track, 482 cylinders
>>             > Units = cylinders of 16065 * 512 = 8225280 bytes
>>             > Sector size (logical/physical): 512 bytes / 512 bytes
>>             > I/O size (minimum/optimal): 512 bytes / 512 bytes
>>             > Disk identifier: 0x00000000
>>             >
>>             >    Device Boot      Start         End      Blocks   Id
>>              System
>>             > /dev/sdi1   *           1           9       72292    c
>>              W95 FAT32 (LBA)
>>             > /dev/sdi2              10         133      996030   83
>>              Linux
>>             and /dev/mmcblk0p2 sounds like the right partition.
>>
>>             Can anybody give a hint where to look further?
>>
>>             Kind regards
>>
>>             Stephan
>>
>>             --
>>             reLinux     -    Stephan Hoffmann
>>             Am Schmidtgrund 124    50765 K?ln
>>             Tel. +49.221.95595-19 <tel:%2B49.221.95595-19>    Fax: -64
>>             www.reLinux.de <http://www.reLinux.de>     sho at reLinux.de
>>             <mailto:sho@reLinux.de>
>>
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>>
>
>
>         -- 
>         reLinux     -    Stephan Hoffmann
>         Am Schmidtgrund 124    50765 K?ln
>         Tel. +49.221.95595-19 <tel:%2B49.221.95595-19>    Fax: -64
>         www.reLinux.de <http://www.reLinux.de>     sho at reLinux.de <mailto:sho@reLinux.de>
>
>
>

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