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-rw-r--r--arch/i386/boot/edd.S2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/i386/boot/edd.S b/arch/i386/boot/edd.S
index d8d69f2b911d..4b84ea216f2b 100644
--- a/arch/i386/boot/edd.S
+++ b/arch/i386/boot/edd.S
@@ -76,6 +76,8 @@ edd_mbr_sig_read:
popw %es
popw %bx
jc edd_mbr_sig_done # on failure, we're done.
+ cmpb $0, %ah # some BIOSes do not set CF
+ jne edd_mbr_sig_done # on failure, we're done.
movl (EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
movl %eax, (%bx) # store success
incb (EDD_MBR_SIG_NR_BUF) # note that we stored something