[PATCH v2] cmd: pxe: add support for FDT overlays

[Tom Rini]

On Mon, Jan 04, 2021 at 03:33:43PM +0100, Neil Armstrong wrote:
> This adds support for specifying FDT overlays in an extlinux/pxelinux
> configuration file.
> 
> Without this, there is no simple way to apply overlays when the kernel
> and fdt is loaded by the pxe command.
> 
> This change adds the 'fdtoverlays' keyword for a label, supporting multiple
> overlay files to be applied on top of the fdt specified in the 'fdt' or
> 'devicetree' keyword.
> 
> Example:
>   label linux
>     kernel /Image
>     devicetree /soc-board.dtb
>     fdtoverlays /soc-board-function.dtbo
>     append console=ttyS0,115200 root=/dev/mmcblk0p2 rootwait
> 
> This code makes usage of a new variable called fdtoverlay_addr_r used to load
> the overlay files without overwritting anything important.
> 
> Cc: Tom Rini <trini at konsulko.com>
> Cc: Andre Heider <a.heider at gmail.com>
> Cc: Jernej Škrabec <jernej.skrabec at siol.net>
> Cc: Jonas Karlman <jonas at kwiboo.se>
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> ---
> Hi Tom,
> 
> This is repost of my last year's attempt.
> It fills a hole to allow loading FDT overlays using PXE/Extlinux without
> using FIT.
> 
> V2 adds documentation.

Thanks for following up.  I assume this follows what the spec says for
this file?

-- 
Tom
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