[U-Boot] environment expectations of config_distro_bootcmd.h

[Stephen Warren <swarren@wwwdotorg.org>]

On 09/28/2014 08:30 AM, Ian Campbell wrote:
> Is there any documentation as to what environment variables a platform
> must provide if it uses config_distro_bootcmd.h. ${scriptaddr} seems
> clear but what about e.g. kernel_addr_r and friends? I suppose the use
> of the pxe commands has some implicit dependencies (pxe_addr_r?)
>
> Along the same lines is there any documentation regarding which
> variables a boot.scr which expects to be called via this mechanism can
> rely on. e.g. devtype/devnum/bootpart/prefix etc. Also foo_addr_r again
> I suppose?
>
> There is some info in the README but it says things like "these
> variables don't have to be defined for all boards" and worse "some
> boards use these variables for other purposes." ;-)

Dennis did write the following when he first sent the patch to create 
include/config_distro_bootcmd.h:

http://patchwork.ozlabs.org/patch/332412/
[U-Boot,1/6] add README.distro file

However, I only cleaned up and resent patch 2 in that series:

http://patchwork.ozlabs.org/patch/332413/
[U-Boot,2/6] add header with a generic set of boot commands defined.

... so the README isn't in place at present.