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| author | H. Peter Anvin <hpa@zytor.com> | 2010-12-23 12:02:52 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-12-23 12:02:52 -0800 |
| commit | d0f275981c9289dc4b8df64e72cd9902bf85aebe (patch) | |
| tree | bc74101d6bcc73ae88c6183f46cefae585a9e52e /mbr | |
| parent | 8255c94785532b1c6fc4937d710379d4c9f679c4 (diff) | |
| download | syslinux-d0f275981c9289dc4b8df64e72cd9902bf85aebe.tar.gz | |
mbr: Make sure the MBR code starts with the byte 0x33
Apparently some BIOSes (including some Acer Travelmate machines)
require an MBR to start with 0x33; apparently Micro$oft MBRs start
with 33 C0, an alternate coding of the "xorw %ax,%ax" instruction. As
such, follow suit to work on these braindead BIOSes.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'mbr')
| -rw-r--r-- | mbr/altmbr.S | 2 | ||||
| -rw-r--r-- | mbr/gptmbr.S | 2 | ||||
| -rw-r--r-- | mbr/isohdpfx.S | 3 | ||||
| -rw-r--r-- | mbr/mbr.S | 2 |
4 files changed, 4 insertions, 5 deletions
diff --git a/mbr/altmbr.S b/mbr/altmbr.S index 794ab623..1b609051 100644 --- a/mbr/altmbr.S +++ b/mbr/altmbr.S @@ -49,8 +49,8 @@ bootsec: .text .globl _start _start: + .byte 0x33, 0xc0 /* xorw %ax, %ax */ cli - xorw %ax, %ax movw %ax, %ds movw %ax, %ss movw $stack, %sp diff --git a/mbr/gptmbr.S b/mbr/gptmbr.S index 8ed4cf48..ae0549f0 100644 --- a/mbr/gptmbr.S +++ b/mbr/gptmbr.S @@ -55,8 +55,8 @@ bootsec: .text .globl _start _start: + .byte 0x33, 0xc0 /* xorw %ax, %ax */ cli - xorw %ax, %ax movw %ax, %ds movw %ax, %ss movw $stack, %sp diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 0bf807e9..2784fb80 100644 --- a/mbr/isohdpfx.S +++ b/mbr/isohdpfx.S @@ -65,9 +65,8 @@ bootsec: .text .globl _start _start: - + .byte 0x33, 0xed /* xorw %bp, %bp */ cli - xorw %bp, %bp movw %bp, %ss movw $stack, %sp sti @@ -49,8 +49,8 @@ bootsec: .text .globl _start _start: + .byte 0x33, 0xc0 /* xorw %ax, %ax */ cli - xorw %ax, %ax movw %ax, %ds movw %ax, %ss movw $stack, %sp |