From a5dacef7380e4414e7fe5831298e31122d24b18d Mon Sep 17 00:00:00 2001
From: Patrick Delaunay <patrick.delaunay@foss.st.com>
Date: Fri, 28 Oct 2022 11:01:19 +0200
Subject: cmd: pxe: support INITRD and FDT selection with FIT

Since the commit d5ba6188dfbf ("cmd: pxe_utils: Check fdtcontroladdr
in label_boot") the FDT or the FDTDIR label is required in extlinux.conf
and the fallback done by bootm command when only the device tree present
in this command parameters is no more performed when FIT is used for
kernel.

When the label FDT or FDTDIR are absent or if the device tree file is
absent, the PXE command in U-Boot uses the default U-Boot device tree
selected by fdtcontroladdr = gd->fdt_blob, it is the "Scenario 3".

With this scenario the bootm FIP fallback is no more possible with
the extlinux.conf when only "kernel" label is present and is a FIP:

  kernel <path>#<conf>[#<extra-conf[#...]]

As the U-Boot FDT is always provided in the third bootm argument,
the device tree found in FIP is not used as fallback, it was done
previously in boot_get_fdt().

This patch adds a new field kernel_label to save the full kernel label.
The FDT bootm parameters use the kernel address (to avoid to load a
second time the same FIP) and the config when this full label is reused
for "fdt" or "initrd" label.

This FIP support in extlinux.conf is restored when the "FDT" label
can be found and select the same FIP (identical file and configuration):

  kernel <path>#<conf>[#<extra-conf[#...]]
  fdt <path>#<conf>[#<extra-conf[#...]]

The patch add also this possibility for initrd.

  initrd <path>#<conf>[#<extra-conf[#...]]

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 include/pxe_utils.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'include/pxe_utils.h')

diff --git a/include/pxe_utils.h b/include/pxe_utils.h
index 4a73b2aace3..1e5e8424f53 100644
--- a/include/pxe_utils.h
+++ b/include/pxe_utils.h
@@ -28,6 +28,7 @@
  * Create these with the 'label_create' function given below.
  *
  * name - the name of the menu as given on the 'menu label' line.
+ * kernel_label - the kernel label, including FIT config if present.
  * kernel - the path to the kernel file to use for this label.
  * append - kernel command line to use when booting this label
  * initrd - path to the initrd to use for this label.
@@ -40,6 +41,7 @@ struct pxe_label {
 	char num[4];
 	char *name;
 	char *menu;
+	char *kernel_label;
 	char *kernel;
 	char *config;
 	char *append;
-- 
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