[Buildroot] [git commit branch/2023.02.x] boot/uboot: document that the zynqmp pmufw can be in ELF format

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=6b293cf0aba93174bd3a9ec8c714a2be8475b610
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2023.02.x

This feature was added in commit d07e6b7071cf ("boot/uboot/uboot.mk: add
pmufw.elf support"), document it in kconfig.

Signed-off-by: Luca Ceresoli <luca.ceresoli at bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
(cherry picked from commit e1e30504164700e9dc7d0bce9d1b4f546923c9c2)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 boot/uboot/Config.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/boot/uboot/Config.in b/boot/uboot/Config.in
index f5c20f5168..085397d03d 100644
--- a/boot/uboot/Config.in
+++ b/boot/uboot/Config.in
@@ -492,6 +492,8 @@ config BR2_TARGET_UBOOT_ZYNQMP_PMUFW
 	  (e.g. http://...), and it will be downloaded and used from
 	  the download directory.
 
+	  The PMU firmware binary can be either in ELF or BIN format.
+
 	  If empty, the generated boot.bin will not contain a PMU
 	  firmware.