[U-Boot] [PATCH] pxe: implement fdtdir extlinux.conf tag

[Stephen Warren <swarren@wwwdotorg.org>]

On 01/24/2014 09:15 AM, Tom Rini wrote:
> On Thu, Jan 23, 2014 at 12:55:27PM -0700, Stephen Warren wrote:
>> From: Stephen Warren <swarren@nvidia.com>
>>
>> People who write (or scripts that auto-generate) extlinux.conf don't
>> want to know about HW-specific information such as FDT filenames. Create
>> a new extlinux.conf tag "fdtdir" that specifies only the directory where
>> FDT files are located, and defer all knowledge of the filename to U-Boot.
>> The algorithm implemented is:
...
>> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> 
> My only real concern is that
> http://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/ is as
> best I can see the spec for extlinux.conf and it doesn't talk about this
> tag.  So while it sounds like a good idea, if we implement it and it's
> not documented outside of U-Boot, will anyone use it?

Well, Dennis is actively working on making Fedora support extlinux.conf
for at least ARM, and said on IRC that he was going to patch the Fedora
generator to use it, so yes:-)

Dennis, should you or I simply edit that wiki, or is there some other
process for changing it?

Related, I notice that it documents a "devicetree" tag, whereas U-Boot
(prior to my patches) actually implements an "fdt" tag for the same
purpose...