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@konsulko.com Cc: Andre Heider a.heider@gmail.com Cc: Jernej Škrabec jernej.skrabec@siol.net Cc: Jonas Karlman jonas@kwiboo.se Signed-off-by: Neil Armstrong narmstrong@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?