UDMA100 drives fall back to UDMA33

[Juha Saarinen]

ata0-master: DMA limited to UDMA33, non-ATA66 cable or device
ata0-slave: DMA limited to UDMA33, non-ATA66 cable or device
ad0: 58644MB <IC35L060AVV207-0/V22OA66A> [119150/16/63] at ata0-master UDMA33
ad1: 29311MB <Maxtor 5T030H3/TAH71DP0> [59554/16/63] at ata0-slave UDMA33
acd0: DVDROM <TOSHIBA DVD-ROM SD-M1202/1020> at ata1-master PIO4

This despite both the drives and 80-pin cables are supposedly ATA100
capable. Tried several cables which make Leenucks and Windows XP
pronounce the drives as operating in UDMA5/ATA100 mode and the BIOS of
the Intel D850GB board says the cable is 80 conductor and the Ultra
DMA mode is 5.

Atacontrol refuses to set the drives beyond UDMA33.

5.4-RELEASE, GENERIC kernel.

-- 

Juha