From: "Jernej Škrabec" <jernej.skrabec@siol.net>
To: u-boot@lists.denx.de
Subject: [PATCH v2] cmd: pxe: add support for FDT overlays
Date: Mon, 04 Jan 2021 17:21:45 +0100 [thread overview]
Message-ID: <6338426.mjuQUSspIG@jernej-laptop> (raw)
In-Reply-To: <20210104144117.GB2292@bill-the-cat>
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 <trini@konsulko.com>
> > Cc: Andre Heider <a.heider@gmail.com>
> > Cc: Jernej ?krabec <jernej.skrabec@siol.net>
> > Cc: Jonas Karlman <jonas@kwiboo.se>
> > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Jernej Skrabec <jernej.skrabec@siol.net>
With above fix:
Reviewed-by: Jernej Skrabec <jernej.skrabec@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
next prev parent reply other threads:[~2021-01-04 16:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-04 14:33 [PATCH v2] cmd: pxe: add support for FDT overlays Neil Armstrong
2021-01-04 14:41 ` Tom Rini
2021-01-04 16:21 ` Jernej Škrabec [this message]
2021-01-05 8:12 ` Neil Armstrong
2021-01-05 8:14 ` Neil Armstrong
2021-01-08 13:43 ` Tom Rini
2021-01-14 23:30 ` Tom Rini
2021-01-20 8:47 ` Neil Armstrong
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