> What is the recommended solution or workaround for this? If I turn off
> UDMA via the bios, everything seems to work (but of course it's unnecessary
> slow). Is it possible to downgrade wd0 to an UDMA mode less than 5 via
> config(8)?
yes. man pciide, man wd (look for flags description).
 
> TIA
>     Ingolf
> 
> This is the initial part of the dmesg output. Note that I have turned off UDMA
> at the moment (see the "wd0(pciide0:0:0):" line).
> 
> NetBSD 1.5.1_BETA (HELIOS) #0: Wed May  2 17:30:29 CEST 2001
>     ingolf@helios:/usr/obj/sys/arch/i386/compile/HELIOS
> cpu0: AMD Duron (686-class), 797.34 MHz
> total memory = 255 MB
> avail memory = 233 MB
> using 3296 buffers containing 13184 KB of memory
> BIOS32 rev. 0 found at 0xfb350
> mainbus0 (root)
> pci0 at mainbus0 bus 0: configuration mode 1
> pci0: i/o space, memory space enabled
> 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)
> pci1 at ppb0 bus 1
> pci1: i/o space, memory space enabled
> vga0 at pci1 dev 0 function 0: ATI Technologies product 0x5046 (rev. 0x00)
> wsdisplay0 at vga0: console (80x25, vt100 emulation)
> pcib0 at pci0 dev 7 function 0
> pcib0: VIA Technologies VT82C686A (Apollo KX133) PCI-ISA Bridge (rev. 0x40) 
> 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: <ST320413A>
> wd0: drive supports 16-sector pio transfers, lba addressing
> wd0: 19092 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 39102336 
> sectorswd0: 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, DMA mode 2 (using DMA data transfers)
> pciide0: secondary channel configured to compatibility mode
> atapibus0 at pciide0 channel 1
> cd0 at atapibus0 drive 0: <LG      CD-ROM CRD-8521B, , 1.02> type 5 cdrom 
> removable
> cd0: 32-bit data port
> cd0: drive supports PIO mode 4, DMA mode 2
> cd1 at atapibus0 drive 1: <LG CD-RW CED-8080B, 2000/07/27, 1.06> type 5 cdrom 
> removable
> cd1: 32-bit data port
> cd1: drive supports PIO mode 4, DMA mode 2
> pciide0: secondary channel interrupting at irq 15
> cd0(pciide0:1:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
> cd1(pciide0:1:1): using PIO mode 4, DMA mode 2 (using DMA data transfers)
> 

-----------------------------------------------
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It is just a bit selective about his friends.