Hi,
I have proposed a more generic patch to handle devicetree stanaza
before see https://lists.gnu.org/archive/html/grub-devel/2019-05/msg00121.html
Fedora separately ships a similarish patch as well
I have no idea why many distributions ship integration to generate
devicetree commands in grub.cfg and yet such patch is not yet in
upstream grub.
I recommend you to look at Ubuntu or Fedora patches to handle
devicetree command generation.
On Mon, Dec 7, 2020 at 11:37 PM Matteo Croce <mcr...@linux.microsoft.com> wrote:
>
> From: Matteo Croce <mcr...@microsoft.com>
>
> Some machines rely on Device Tree for hardware discovery, so a
> .dtb file must be passed to the kernel.
>
> GRUB can do this via the `devicetree` command, but it's not possible
> to do this from the user configuration.
>
> Add a GRUB_DEVICETREE_FILE variable which holds the path of the .dtb
> file relative to the boot partition and, if present, adds the
> devicetree command to the menuentry.
>
> Signed-off-by: Matteo Croce <mcr...@microsoft.com>
> ---
> util/grub-mkconfig.in | 1 +
> util/grub.d/10_linux.in | 5 +++++
> 2 files changed, 6 insertions(+)
>
> diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
> index d3e879b8e..3e15e6f20 100644
> --- a/util/grub-mkconfig.in
> +++ b/util/grub-mkconfig.in
> @@ -228,6 +228,7 @@ export GRUB_DEFAULT \
> GRUB_CMDLINE_NETBSD \
> GRUB_CMDLINE_NETBSD_DEFAULT \
> GRUB_CMDLINE_GNUMACH \
> + GRUB_DEVICETREE_FILE \
> GRUB_EARLY_INITRD_LINUX_CUSTOM \
> GRUB_EARLY_INITRD_LINUX_STOCK \
> GRUB_TERMINAL_INPUT \
> diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
> index e8b01c0d0..fb1bd30f5 100644
> --- a/util/grub.d/10_linux.in
> +++ b/util/grub.d/10_linux.in
> @@ -143,6 +143,11 @@ linux_entry ()
> echo '$(echo "$message" | grub_quote)'
> linux ${rel_dirname}/${basename}
> root=${linux_root_device_thisversion} ro ${args}
> EOF
> + if [ -n "${GRUB_DEVICETREE_FILE}" ] && test -e
> "${dirname}/${GRUB_DEVICETREE_FILE}"; then
> + sed "s/^/$submenu_indentation/" << EOF
> + devicetree ${rel_dirname}/${GRUB_DEVICETREE_FILE}
> +EOF
> + fi
> if test -n "${initrd}" ; then
> # TRANSLATORS: ramdisk isn't identifier. Should be translated.
> message="$(gettext_printf "Loading initial ramdisk ...")"
> --
> 2.28.0
>
>
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> https://lists.gnu.org/mailman/listinfo/grub-devel
--
Regards,
Dimitri.
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