On Thu, 2007-05-03 at 05:31, Alex Zeffertt wrote:

Hi all,

I'm trying to boot linux-2.6.21-rc5 on my mpc832xemds board which is running u-boot 1.2.0.

According to u-boot I need a device tree blob:

=> help bootm bootm [addr [arg ...]] - boot application image stored in memory passing arguments 'arg ...'; when booting a Linux kernel, 'arg' can be the address of an initrd image When booting a Linux kernel which requires a flat device-tree a third argument is required which is the address of the of the device-tree blob. To boot that kernel without an initrd image, use a '-' for the second argument. If you do not pass a third a bd_info struct will be passed instead

Can anybody tell me where I can find one for this board?

In short, you make the ".dtb" file from a .dts file. The DTS files are likely found in the Linux kernel sources in the directory arch/powerpc/boot/dts/ or else you make one up specifically for your (custom) board.

You use the Device Tree Compiler, which is found on www.jdl.com/git_repos

The command invocation you want will be something like:

.dtc -b 0 -f -I dts -O dtb mpcXXXX.dts > mpcXXXX.dtb

And you may want to add something like "-S 0x3000" too.

HTH, jdl