[U-Boot] [PATCH] cmd: pxe: Use internal FDT if external one cannot be retrieved

Stephen Warren swarren at wwwdotorg.org
Mon Aug 26 15:59:35 UTC 2019

On 8/23/19 8:40 AM, Anton Leontiev wrote:
> From: Anton Leontiev <aleontiev at elvees.com>
> Original commit c61d94d86035 ("pxe: implement fdtdir extlinux.conf tag")
> states, that if FDT file cannot be retrieved then FDT packaged in
> firmware should be used.

It's not meant to say that. I believe the part of the description you're 
referring to is:

     if no FDT file was loaded, and $fdtaddr is set:
       # This indicates an FDT packaged with firmware
       use the FDT at $fdtaddr

That wasn't meant to say anything about "if there was an error loading 
the FDT file", but rather is meant to mean "if no FDT file was loaded 
because extlinux.conf contained no fdt or fdtdir statement". Nothing 
there is intended to refer to errors loading a specified FDT file.

> If FDT file cannot be retrieved and it is specified explicitly using
> FDT keyword then the label is skipped. If it cannot be found in
> FDTDIR then internal FDT is tried first.

This makes the fdt/fdtdir keywords work differently. I don't think we 
want that.

What specific problem are you trying to solve?

And note that if we do change anything here, we should update the 
comment at around line 730, which describes the algorithm that's 

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