Machine: 1.1 GHz Thunderbird, 0.5G RAM, relevant dmesg:


NetBSD 1.5 (S) #1: Wed Mar 21 16:27:39 PST 2001
cpu0: AMD K7 (Athlon) (686-class)
total memory = 511 MB
avail memory = 468 MB

pchb0 at pci0 dev 0 function 0
pchb0: VIA Technologies product 0x0305 (rev. 0x03)
ppb0 at pci0 dev 1 function 0: VIA Technologies product 0x8305 (rev. 0x00)

pciide0 at pci0 dev 10 function 0: Promise Ultra100/ATA Bus Master IDE Accelerator (rev. 0x02)
pciide0: bus-master DMA support present
pciide0: primary channel configured to native-PCI mode
pciide0: using irq 15 for native-PCI interrupt

wd0 at pciide0 channel 0 drive 0: <IBM-DTLA-307030>
wd0: drive supports 16-sector pio transfers, lba addressing
wd0: 29314 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 60036480 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 4 (using DMA data transfers)

pciide0: secondary channel configured to native-PCI mode
pciide0: disabling secondary channel (no drives)

-------

The Promise Ultra/100 can do UDMA 100, and the IBM drive also supports
Ultra-DMA mode 5, yet, for some reason, only Ultra-DMA mode 4 is used.

Why is this?  Do I need to set some flags somewhere?

Thanks!  -Mike


p.s. The motherboard is supposed to do native UDMA-100, but, as you can
see from the snippet below, only Ultra-DMA Mode 2 was used(!).  That's
why I bought the Promise board, because it was definitely UDMA 100 capable.


pciide0 at pci0 dev 7 function 1: VIA Tech VT82C586A IDE Controller (rev. 0x06)
pciide0: bus-master DMA support present
pciide0: primary channel configured to compatibility mode

wd0 at pciide0 channel 0 drive 0: <IBM-DTLA-307030>
wd0: drive supports 16-sector pio transfers, lba addressing
wd0: 29314 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 60036480 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5
pciide0: primary channel interrupting at irq 14
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data transfers)