K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2011-06-27T10:42:06.554099Z
K 7
svn:log
V 366
MS Windows NT+ uses 4 bytes at offset 0x1b8 in the MBR to identify
disk drive. The boot0cfg(8) utility preserves these 4 bytes when is
writing bootcode to keep a multiboot ability.
Change gpart's bootcode method to keep DSN if it is not zero. Also
do not allow writing bootcode with size not equal to MBRSIZE.

PR:		kern/157819
Tested by:	Eir Nym
MFC after:	1 month

END