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[PATCH] kern/efi/mm: Double the default heap size

From: Hector Martin
Subject: [PATCH] kern/efi/mm: Double the default heap size
Date: Sun, 21 Aug 2022 00:24:13 +0900

GRUB is already running out of memory on Apple M1 systems, causing
graphics init to fail, as of the latest Git changes. Since dynamic
growing of the heap isn't done yet, double the default heap size for

Signed-off-by: Hector Martin <>
 grub-core/kern/efi/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
index d290c9a76270..377d8d3a1c1b 100644
--- a/grub-core/kern/efi/mm.c
+++ b/grub-core/kern/efi/mm.c
@@ -39,7 +39,7 @@
 #define MEMORY_MAP_SIZE        0x3000
 /* The default heap size for GRUB itself in bytes.  */
-#define DEFAULT_HEAP_SIZE      0x100000
+#define DEFAULT_HEAP_SIZE      0x200000
 static void *finish_mmap_buf = 0;
 static grub_efi_uintn_t finish_mmap_size = 0;

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