doc: document the fdtdir PXE command
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
diff --git a/doc/README.pxe b/doc/README.pxe
index 8363383..bd175eb 100644
--- a/doc/README.pxe
+++ b/doc/README.pxe
@@ -155,6 +155,13 @@
the fdt_addr_r environment variable, and that address will
be passed to bootm.
+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
+ filename is generated from the soc and board environment
+ variables, i.e. <path>/<soc>-<board>.dtb is retrieved.
+ If the fdt command is specified, fdtdir is ignored.
+
localboot <flag> - Run the command defined by "localcmd" in the environment.
<flag> is ignored and is only here to match the syntax of
PXELINUX config files.