[U-Boot] [PATCH 2/2] omap3_beagle: xM A/B validate new dtb exits in file system

[Robert Nelson]

On Fri, May 2, 2014 at 3:15 PM, robertcnelson <robertcnelson at gmail.com> wrote:
> From: Robert Nelson <robertcnelson at gmail.com>
>
> Fall back to previous dtb used when omap3-beagle-xm-ab.dtb doesn't exist in file system
>
> Signed-off-by: Robert Nelson <robertcnelson at gmail.com>
> CC: Tom Rini <trini at ti.com>
> CC: Nishanth Menon <nm at ti.com>
> ---
>  include/configs/omap3_beagle.h | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
> index a1d38ff..06b9006 100644
> --- a/include/configs/omap3_beagle.h
> +++ b/include/configs/omap3_beagle.h
> @@ -248,6 +248,12 @@
>                         "setenv fdtfile omap3-beagle-xm.dtb; fi; " \
>                 "if test $fdtfile = undefined; then " \
>                         "echo WARNING: Could not determine device tree to use; fi; \0" \
> +       "validatefdt=" \
> +               "if test $beaglerev = xMAB; then " \
> +                       "if test ! -e mmc ${bootpart} ${bootdir}/${fdtfile}; then " \
> +                               "setenv fdtfile omap3-beagle-xm.dtb; " \
> +                       "fi; " \
> +               "fi; \0" \
>         "bootenv=uEnv.txt\0" \
>         "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
>         "importbootenv=echo Importing environment from mmc ...; " \
> @@ -263,7 +269,7 @@
>                 "rootfstype=${ramrootfstype}\0" \
>         "loadramdisk=load mmc ${bootpart} ${rdaddr} ${bootdir}/${ramdisk}\0" \
>         "loadimage=load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootfile}\0" \
> -       "loadfdt=load mmc ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}\0" \
> +       "loadfdt=run validatefdt; load mmc ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}\0" \
>         "mmcboot=echo Booting from mmc ...; " \
>                 "run mmcargs; " \
>                 "bootm ${loadaddr}\0" \
> --
> 1.9.2

Little git send-email failure here, I was trying to send this second
as patch as [RFC].

This is my first thoughts of keeping backward compatibility with less
then v3.15-rc3 kernels.

Thoughts?

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/