cmd: pxe: add alias devicetree-overlay for fdtoverlays
This adds keyword devicetree-overlay as an alias for fdtoverlays in
extlinux (sysboot) and pxe to better follow the Boot Loader Specification
[1], improves documentation around them by adding an example for both
fdtoverlays and devicetree-overlay and the environment variable required
for this feature. The link for the spec is updated to the current one.
[1] https://systemd.io/BOOT_LOADER_SPECIFICATION/
Signed-off-by: Edoardo Tomelleri <e.tomell@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/doc/README.pxe b/doc/README.pxe
index 75caa01..d14d2bd 100644
--- a/doc/README.pxe
+++ b/doc/README.pxe
@@ -163,6 +163,13 @@
and then applied in the load order to the fdt blob stored at the
address indicated in the fdt_addr_r environment variable.
+devicetree-overlay <path> [...] - if this label is chosen, use tftp to retrieve the DT
+ overlay(s) at <path>. it will be temporarily stored at the
+ address indicated in the fdtoverlay_addr_r environment variable,
+ and then applied in the load order to the fdt blob stored at the
+ address indicated in the fdt_addr_r environment variable.
+ Alias for fdtoverlays.
+
kaslrseed - set this label to request random number from hwrng as kaslr seed.
append <string> - use <string> as the kernel command line when booting this
@@ -178,6 +185,11 @@
the fdt_addr_r environment variable, and that address will
be passed to bootm.
+devicetree <path> - if this label is chosen, use tftp to retrieve the fdt blob
+ at <path>. it will be stored at the address indicated in
+ the fdt_addr_r environment variable, and that address will
+ be passed to bootm. Alias for fdt.
+
fdtdir <path> - if this label is chosen, use tftp to retrieve a fdt blob
relative to <path>. If the fdtfile environment variable
is set, <path>/<fdtfile> is retrieved. Otherwise, the