Re: Bug#773890: flash-kernel: No entry for BeagleBone Black when running 3.18 kernel
On Sun, Dec 28, 2014 at 10:00 PM, Vagrant Cascadian <vagrant@debian.org> wrote:
> On 2014-12-28, Robert Nelson wrote:
>> On Sun, Dec 28, 2014 at 6:26 PM, Vagrant Cascadian <vagrant@debian.org> wrote:
>>> On 2014-12-28, Ian Campbell wrote:
>>>> OOI, do you know how broken the white is when booting with the black's
>>>> DTB? Completely unusable, missing some minor peripheral or somewhere in
>>>> the middle?
> ...
>> Oh you definitely don't want to run the wrong *.dtb on the black/white..
>>
>> In u-boot the findfdt function will correctly set the fdtfile variable.
>>
>> http://git.denx.de/?p=u-boot.git;a=blob;f=include/configs/am335x_evm.h;hb=HEAD#l176
>>
>> Notice:
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/arch/arm/boot/dts/am335x-boneblack.dts?id=2ba3549352277514a8e4790adff77a783ee1b9e2
>>
>> IMPORTANT: booting the existing am335x-bone.dts will blow up the HDMI
>> transceiver after a dozen boots with an uSD card inserted because LDO
>> will be at 3.3V instead of 1.8.
>>
>> Also the 'white' uses DDR2, while the 'black" uses DDR3
>
> Ok, so given that it might actually damage hardware to run with the
> wrong dtb, I've written up a few UNTESTED patches to support multiple
> DTB-Id entries:
>
> * copy a .dtb file to /boot in addition to the /boot/dtb-${version}
> file, named using the ${fdtfile} variable.
While reviewing I noticed one little gottcha.. This is more of a blame
squarely at u-boot..
imx targets use:
fdt_file
http://git.denx.de/?p=u-boot.git;a=blob;f=include/configs/wandboard.h;h=809017c5fe225278c87619e237fd0905b9c1dcf1;hb=HEAD#l140
omap targets use:
fdtfile
Isn't that awesome. ;)
Regards,
--
Robert Nelson
http://www.rcn-ee.com/
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