[OE-core][PATCH] grub: update search parameter

[Xiangyu Chen <xiangyu.chen@eng.windriver.com>]

From: Xiangyu Chen <xiangyu.chen@windriver.com>

Grub would report an error message in boot stage as below:

   "error: no such device: ((hd0,gpt1)/EFI/BOOT)/EFI/BOOT/grub.cfg"

Consequently, the root variable is not set, and the intended protection
against cross-device configuration loading (the purpose of the original 2014 commit)
is lost.

The most robust fix is to use the --hint parameter.
This separates the search target from the device hint, avoiding
fragile string concatenation and supporting both prefixed and
non-prefixed $cmdpath formats.

Fixes: 5ce73b6055ac ("grub: add cmdpath to grub configuration file")
Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
---
 meta/recipes-bsp/grub/files/cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/recipes-bsp/grub/files/cfg b/meta/recipes-bsp/grub/files/cfg
index 8ca53d24d7..8fe1a8d0c7 100644
--- a/meta/recipes-bsp/grub/files/cfg
+++ b/meta/recipes-bsp/grub/files/cfg
@@ -1,2 +1,2 @@
-search.file ($cmdpath)/EFI/BOOT/grub.cfg root
+search --file --set=root --hint-efi=$cmdpath /EFI/BOOT/grub.cfg
 set prefix=($root)/EFI/BOOT
-- 
2.39.4