From: Andrey Borzenkov Some BIOSes do not always set CF on error before return from int13. The patch adds additional check for status being zero (AH == 0). Signed-off-by: Andrey Borzenkov Cc: Matt Domsch Signed-off-by: Andrew Morton --- arch/i386/boot/edd.S | 2 ++ 1 files changed, 2 insertions(+) diff -puN arch/i386/boot/edd.S~fix-edd-to-properly-ignore-signature-of-non-existing-drives arch/i386/boot/edd.S --- devel/arch/i386/boot/edd.S~fix-edd-to-properly-ignore-signature-of-non-existing-drives 2006-02-25 15:56:34.000000000 -0800 +++ devel-akpm/arch/i386/boot/edd.S 2006-02-25 15:56:34.000000000 -0800 @@ -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 _