en though the 
underlying disk layout of extended partitions is hierarchical in nature.
For example, if the boot loader boots from the second extended partition
on a disk partitioned in conventional DOS style, then 'part1' will be 5,
and 'part2' and 'part3' will both be 0xFF.<P>

If bit 2 of the flags longword is set, the 'cmdline' field is valid, and 
contains the physical address of the the command line to be passed to the
kernel.  The command line is a normal C-style null-terminated string.<P>

If bit 3 