diff options
Diffstat (limited to 'pc-bios/optionrom')
| -rwxr-xr-x | pc-bios/optionrom/signrom.sh | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/pc-bios/optionrom/signrom.sh b/pc-bios/optionrom/signrom.sh index 975b27d..9dc5c63 100755 --- a/pc-bios/optionrom/signrom.sh +++ b/pc-bios/optionrom/signrom.sh @@ -31,14 +31,13 @@ x=`dd if="$1" bs=1 count=1 skip=2 2>/dev/null | od -t u1 -A n` size=$(( $x * 512 - 1 )) # now get the checksum -nums=`od -A n -t u1 -v "$1"` +nums=`od -A n -t u1 -v -N $size "$1"` for i in ${nums}; do # add each byte's value to sum - sum=`expr $sum + $i` + sum=`expr \( $sum + $i \) % 256` done -sum=$(( $sum % 256 )) -sum=$(( 256 - $sum )) +sum=$(( (256 - $sum) % 256 )) sum_octal=$( printf "%o" $sum ) # and write the output file |