I am not sure if this is a bug in mkdiskimage in syslinux-2.06
[root at femto-server syslinux]# ls
copybs.com isolinux-debug.bin memdisk pxelinux.0 syslinux.com
isolinux.bin keytab-lilo.pl mkdiskimage sys2ansi.pl syslinux.exe
[root at femto-server syslinux]# ./mkdiskimage tmp.img 64 4 63
[root at femto-server syslinux]# fdisk -l tmp.img
bash: fdisk: command not found
[root at femto-server syslinux]# /sbin/fdisk -l tmp.img
You must set cylinders.
You can do this from the extra functions menu.
Disk tmp.img: 5 heads, 63 sectors, 0 cylinders
Units = cylinders of 315 * 512 bytes
Device Boot Start End Blocks Id System
tmp.img1 * 1 52 8032+ 4 FAT16 <32M
-----------error? must to be 1 to 64
Partition 1 has different physical/logical endings:
phys=(64, 4, 63) logical=(51, 0, 63)
[root at femto-server syslinux]# cat mkdiskimage
(begin)...........
#////////////////////mkdiskimage orginal code
here////////////////////////////////////////////////
$mbr .= "\0" x (446 - length($mbr));
print OUTPUT $mbr;
# Print partition table
$psize = $c*$h*$s-$s;
$bhead = ($h > 1) ? 1 : 0;
$bsect = 1;
$bcyl = ($h > 1) ? 0 : 1;
$ehead = $h; #--------------should be: $ehead=$h-1
$esect = $s + (($c & 0x300) >> 2);
$ecyl = $c & 0xff; #--------------should be: $ecyl =
($c-1) & 0xff;
if ( $psize > 65536 ) {
$fstype = 0x06;
} else {
$fstype = 0x04;
}
print OUTPUT pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype,
$ehead, $esect, $ecyl, $s, $psize);
print OUTPUT "\0" x 48;
print OUTPUT "\x55\xaa";
.......(end)
///////////////////////////////code
end////////////////////////////////////////////////////////
i think:
if your command line is "mkdiskimage tmp.img 64 4 63"
means that $c=64,$h=4,$s=63
means that there are 64 cylindars ,4 heads and 63 sectors per track.
so the cylindars number is from 0 to 63,and head from 0 to 3,but sector still
from 1 to 63.
so i modify as following:
////////////////////////////////mkdiskimage code
modified//////////////////////////////////////
(begin).......
# Print partition table
$psize = $c*$h*$s-$s;
$bhead = ($h > 1) ? 1 : 0;
$bsect = 1;
$bcyl = ($h > 1) ? 0 : 1;
$ehead = $h-1;
$esect = $s + (($c & 0x300) >> 2);
$ecyl = ($c-1)& 0xff;
if ( $psize > 65536 ) {
$fstype = 0x06;
} else {
$fstype = 0x04;
}
print OUTPUT pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype,
$ehead, $esect, $ecyl, $s, $psize);
print OUTPUT "\0" x 48;
print OUTPUT "\x55\xaa";
...............(end)
//////////////////////////////code
end////////////////////////////////////////////////////////////
[root at femto-server syslinux]# mkdiskimage tmp.img -t 64 -h 4 -s 63
[root at femto-server syslinux]# /sbin/fdisk -l tmp.img
You must set cylinders.
You can do this from the extra functions menu.
Disk tmp.img: 4 heads, 63 sectors, 0 cylinders
Units = cylinders of 252 * 512 bytes
Device Boot Start End Blocks Id System
tmp.img1 * 1 64 8032+ 4 FAT16 <32M