On 04/01/2021 17:21, Jernej Škrabec wrote: > Dne ponedeljek, 04. januar 2021 ob 15:41:17 CET je Tom Rini napisal(a): >> 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 > > This should be "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 <tr...@konsulko.com> >>> Cc: Andre Heider <a.hei...@gmail.com> >>> Cc: Jernej Škrabec <jernej.skra...@siol.net> >>> Cc: Jonas Karlman <jo...@kwiboo.se> >>> Signed-off-by: Neil Armstrong <narmstr...@baylibre.com> > > Tested-by: Jernej Skrabec <jernej.skra...@siol.net> > > With above fix: > Reviewed-by: Jernej Skrabec <jernej.skra...@siol.net> > >>> --- >>> 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? > > Which specs? Official extlinux configuration specs [1] don't say anything > about > device tree files, so anything related to that is an extension (I hope I > found > correct specs). I think this one is extremely useful, users can easily > specify > which overlay file(s) they want to be applied in a text file. > > Best regards, > Jernej > > [1] https://repo.or.cz/syslinux.git/blob/HEAD:/doc/syslinux.txt > >
