Use GRUB2 legacy loader for Macbook Air A1370 (#3593)

Fix loading issues on this Intel-based platform as well. As described in the
patch commit message, there will be likely bigger collateral effect by
referring just to the CPU ID but it shouldn't have major detrimental effects.

[1] #3305 (comment)

Author: sairon

buildroot-external/patches/grub2/0002-loader-efi-linux-use-legacy-loader-for-broken-Intel-.patch

@@ -1,4 +1,4 @@
-From 545edfcbb505dfa0fc007416dc8b69a8e65f9557 Mon Sep 17 00:00:00 2001
+From 6c0a2197bad3c339a638ea59b1eb36b5e449f7b8 Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Jan=20=C4=8Cerm=C3=A1k?= <[email protected]>
 Date: Tue, 30 Jul 2024 18:27:24 +0200
 Subject: [PATCH] loader/efi/linux: use legacy loader for broken Intel NM10
@@ -29,13 +29,22 @@ Also AMD GX-212JC in HP t520 seems to be affected as reported in [3].
 
 [3] https://github.com/home-assistant/operating-system/issues/3557
 
+----
+
+Added CPU ID for Macbook Air's Intel i5 CPU reported in [4]. This will
+likely target also other i5-based systems that are not affected by the
+EFI bug but it should cause no harm, as the legacy loader was used in
+pre-2.12 GRUB anyway.
+
+[4] https://github.com/home-assistant/operating-system/issues/3305#issuecomment-2360633688
+
 Signed-off-by: Jan Čermák <[email protected]>
 ---
- grub-core/loader/efi/linux.c | 66 +++++++++++++++++++++++++++++++++++-
- 1 file changed, 65 insertions(+), 1 deletion(-)
+ grub-core/loader/efi/linux.c | 67 +++++++++++++++++++++++++++++++++++-
+ 1 file changed, 66 insertions(+), 1 deletion(-)
 
 diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
-index bfbd95aee..efeb692f8 100644
+index bfbd95a..98ac99c 100644
 --- a/grub-core/loader/efi/linux.c
 +++ b/grub-core/loader/efi/linux.c
 @@ -24,6 +24,7 @@
@@ -46,7 +55,7 @@ index bfbd95aee..efeb692f8 100644
  #include <grub/types.h>
  #include <grub/efi/efi.h>
  #include <grub/efi/fdtload.h>
-@@ -452,6 +453,68 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+@@ -452,6 +453,69 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
    return grub_errno;
  }
 
@@ -97,7 +106,8 @@ index bfbd95aee..efeb692f8 100644
 +           */
 +          return (processor_id == 0xbfebfbff00030661      // D2xxx/N2xxx
 +                  || processor_id == 0xbfebfbff000106ca   // D525
-+                  || processor_id == 0x00730f01178bfbff); // AMD GX-212JC (HP t520)
++                  || processor_id == 0x00730f01178bfbff   // AMD GX-212JC (HP t520)
++                  || processor_id == 0xbfebfbff000206a7); // Intel i5-2xxx (Macbook Air A1370)
 +        }
 +      else
 +        {
@@ -115,7 +125,7 @@ index bfbd95aee..efeb692f8 100644
  static grub_err_t
  grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
  		int argc, char *argv[])
-@@ -490,7 +553,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+@@ -490,7 +554,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
 
    kernel_size = grub_file_size (file);