[U-Boot] Uboot - verified boot - CONFIG_OF_SEPARATE

[Simon Glass]

Hi,

On 11 March 2014 05:39, Thilo Cestonaro <thilo at cestona.ro> wrote:
> Hey!
>
> When I build my Uboot with the CONFIG_OF_SEPARATE set to gain access to the
> compiled dtb, Uboot can't find my concatenated dtb during the boot.
> After injecting the pulbic keys for the verified boot, I cat the u-boot.dtb
> behind the u-boot.bin. After that I mkimage the u-boot.img as usuall.
>
> I found, that if I change the offset where the fdt_blob is searched for by
> +300, it finds the dtb correctly.
> Like this:
> -------------------
>  #elif defined CONFIG_OF_SEPARATE
>         /* FDT is at end of image */
> -       gd->fdt_blob = (void *)(_end_ofs + _TEXT_BASE);
> +       gd->fdt_blob = (void *)(_end_ofs + _TEXT_BASE + 300);
>  #endif
> -------------------
>
> But I can't explain why this might be. The 300 isn't a random value! I
> calculated it via some debug output and it works reliably.
> But like it is with these workarounds, I don't like them!
> So I'm searching for an answer.
>
> Any ideas, why the offset is not _end_ofs + _TEXT_BASE, like it should be?

I just saw this now. You probably already know the outcome, but for
the record, commit 8974292 added a check for this problem, and it was
fixed for TI boards. Specifically for the Beaglebone, see
doc/uImage.FIT/beaglebone_vboot.txt for a walk-through.

Regards,
Simon