Module Name:	src
Committed By:	bouyer
Date:		Wed Mar 10 13:11:44 UTC 1999

Modified Files:
	src/sys/dev/ata: ata.c atavar.h
	src/sys/dev/ic: wdc.c
Log Message:
Add a new disk flag: DRIVE_OLD for pre-ATA disks. probe routine will now set
DRIVE_OLD, DRIVE_ATA or DRIVE_ATAPI based on register signatures.
The attach routine will issue a IDENTIFY command for ATA/ATAPI disk,
to detect flase matches by the probe routine.
probe/attach should now be fully compliant with ata-4/ata-5. As a side
effect, ATAPI drives which improperly use ATA register signatures should now
be attached as ATAPI.