[PATCH v3] cmd: pxe: add support for FDT overlays

[Tom Rini]

On Wed, Jan 20, 2021 at 09:54:53AM +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
>     fdt /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>
> Tested-by: Jernej Škrabec <jernej.skrabec at siol.net>
> Reviewed-by: Jernej Škrabec <jernej.skrabec at siol.net>
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>

Applied to u-boot/master, thanks!

-- 
Tom
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