[U-Boot-Users] u-boot r1 machine type value to AT91RM9200 2.6.12 kernel

[Steven Scholz <steven.scholz@imc-berlin.de>]

Sascha,

> I tried to use the linux 2.6.12  release for AT91RM9200, but when I started
> with u-boot 1.1.2 the Kernel stopped.

It is a custom board? Did you register a MACH_NUMBER?

> I can configure a working kernel with the option 'config NAKED_Boot= y ',
> but
> with this option it's not possible to pass any bootarguments to the kernel.
> How can I pass the corret R1 value for the machine type ('0xfb') from u-boot
> 1.1.2  to the kernel?

In you board_init() do something like:

         /* arch number of AT91RM9200 */
         /*gd->bd->bi_arch_number = 251;*/
         gd->bd->bi_arch_number = MACH_TYPE_MULTIIO;
         /* adress of boot parameters */
         gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;

> The last working kernel in combination with u-boot was 2.6.12rc4. What
> changes in the u-boot source do I have to maintain relating to these boot
> options? Or is it possible to pass the r1 value in between the 'bootargs' of
> the u-boot enviroment?
No.

Just make sure your board_init() sets the correct (TM) arch_number.

See kernel sources

linux-2.6.12/arch/arm/boot/compressed/head-at91rm9200.S

--
Steven