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-rw-r--r--pc-bios/optionrom/multiboot.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/pc-bios/optionrom/multiboot.S b/pc-bios/optionrom/multiboot.S
index 93beb51b63..e6cbefdc92 100644
--- a/pc-bios/optionrom/multiboot.S
+++ b/pc-bios/optionrom/multiboot.S
@@ -113,7 +113,10 @@ mmap_loop:
/* entry size (mmap struct) & max buffer size (int15) */
movl $20, %ecx
/* store entry size */
+ /* old as(1) doesn't like this insn so emit the bytes instead:
movl %ecx, %es:-4(%edi)
+ */
+ .dc.b 0x26,0x67,0x66,0x89,0x4f,0xfc
/* e820 */
movl $0x0000e820, %eax
/* 'SMAP' magic */