I've installed the amd64 -current (13 August) on my ASUS K8S-MX system. 
It solved the "bus-master DMA error" problem as well as the problem with 
the drives (CD & hard disk) on the secondary IDE not being recognized. I 
compiled the kernel and the rest of the system from source just to 
exercise the computer. Using the BIOS settings to overclock the CPU by 
about 10% from 1.8Ghz to 2.0GHz also seems to work ok.

I'm still not able to use the built-in ethernet. The dmesg shows:

vendor "SIS", unknown product 0x0190 (class network subclass ethernet, 
rev 0x00) at pci0 dev 4 function 0 not configured

>From the motherboard user guide this is:

SIS 191/190 MAC+ Realtek RTL8201CL 10/100 LAN PHY

The dmesg shows these "unknown" items:

ppb1 at pci0 dev 6 function 0 vendor "SIS", unknown product 0x000a rev 
0x00
ppb2 at pci0 dev 7 function 0 vendor "SIS", unknown product 0x000a rev 
0x00
lm0 at isa0 port 0x290/8: unknown winbond chip ID 0x88

I decided to try another ethernet board I had:

dc0 at pci0 dev 9 function 0 "Lite-On PNIC" rev 0x20: irq 10, address 
00:a0:cc:24:be:91

During the boot process I get this message:

dc0: failed to force tx and rx to idle state

repeated twice, after the "starting network" line. The network seems to 
work just fine. What does this indicate? Since it only appears during 
boot is it something I can just ignore?

Does this:

"SIS 182 SATA" rev 0x01 at pci0 dev 5 function 0 not configured

just mean there were no SATA drives connected? Will SATA drives work when 
connected to this motherboard?

The complete dmesg output follows this message.

Joe
-----
OpenBSD 3.8-beta (GENERIC) #0: Sat Aug 13 07:51:35 CDT 2005
    [EMAIL PROTECTED]:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 502722560 (490940K)
avail mem = 419856384 (410016K)
using 12324 buffers containing 50479104 bytes (49296K) of memory
mainbus0 (root)
cpu0 at mainbus0: (uniprocessor)
cpu0: AMD Athlon(tm) 64 Processor 2800+, 2029.82 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFL
USH,MMX,FXSR,SSE,SSE2,NXE,MMXX,LONG,3DNOW2,3DNOW
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB 
64b/line 16-way L2 cache
cpu0: ITLB 32 4KB entries fully associative, 8 4MB entries fully 
associative
cpu0: DTLB 32 4KB entries fully associative, 8 4MB entries fully 
associative
pci0 at mainbus0 bus 0: configuration mode 1
pchb0 at pci0 dev 0 function 0 "SIS 760 PCI" rev 0x03
ppb0 at pci0 dev 1 function 0 "SIS 86C202 VGA" rev 0x00
pci1 at ppb0 bus 1
vga1 at pci1 dev 0 function 0 "SIS 6330 VGA" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
"SIS 965 PCI" rev 0x47 at pci0 dev 2 function 0 not configured
pciide0 at pci0 dev 2 function 5 "SIS 5513 EIDE" rev 0x01: 760: DMA, 
channel 0 wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <QUANTUM FIREBALLlct15 10>
wd0: 16-sector PIO, LBA, 9736MB, 19941264 sectors
wd1 at pciide0 channel 0 drive 1: <QUANTUM FIREBALL EX3.2A>
wd1: 16-sector PIO, LBA, 3079MB, 6306048 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 4
wd1(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 2
wd2 at pciide0 channel 1 drive 0: <HDS722512VLAT20>
wd2: 16-sector PIO, LBA48, 117800MB, 241254720 sectors
atapiscsi0 at pciide0 channel 1 drive 1
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <E-IDE, CD-ROM 52X/AKH, A63> SCSI0 5/cdrom 
removable
wd2(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 5
cd0(pciide0:1:1): using PIO mode 4, Ultra-DMA mode 2
auich0 at pci0 dev 2 function 7 "SIS 7012 AC97" rev 0xa0: irq 10, SiS7012 
AC97
ac97: codec id 0x41445368 (Analog Devices AD1888)
ac97: codec features headphone, 20 bit DAC, No 3D Stereo
audio0 at auich0
ohci0 at pci0 dev 3 function 0 "SIS 5597/5598 USB" rev 0x0f: irq 5, 
version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: SIS OHCI root hub, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1 at pci0 dev 3 function 1 "SIS 5597/5598 USB" rev 0x0f: irq 5, 
version 1.0, legacy support
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: SIS OHCI root hub, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
ohci2 at pci0 dev 3 function 2 "SIS 5597/5598 USB" rev 0x0f: irq 3, 
version 1.0, legacy support
usb2 at ohci2: USB revision 1.0
uhub2 at usb2
uhub2: SIS OHCI root hub, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0 at pci0 dev 3 function 3 "SIS 7002 USB" rev 0x00: irq 5
usb3 at ehci0: USB revision 2.0
uhub3 at usb3
uhub3: SIS EHCI root hub, rev 2.00/1.00, addr 1
uhub3: 8 ports with 8 removable, self powered
vendor "SIS", unknown product 0x0190 (class network subclass ethernet, 
rev 0x00) at pci0 dev 4 function 0 not configured
"SIS 182 SATA" rev 0x01 at pci0 dev 5 function 0 not configured
ppb1 at pci0 dev 6 function 0 vendor "SIS", unknown product 0x000a rev 
0x00
pci2 at ppb1 bus 2
ppb2 at pci0 dev 7 function 0 vendor "SIS", unknown product 0x000a rev 
0x00
pci3 at ppb2 bus 3
dc0 at pci0 dev 9 function 0 "Lite-On PNIC" rev 0x20: irq 10, address 
00:a0:cc:24:be:91
mtdphy0 at dc0 phy 1: MTD972 10/100 PHY, rev. 8
pchb1 at pci0 dev 24 function 0 "AMD AMD64 HyperTransport" rev 0x00
pchb2 at pci0 dev 24 function 1 "AMD AMD64 Address Map" rev 0x00
pchb3 at pci0 dev 24 function 2 "AMD AMD64 DRAM Cfg" rev 0x00
pchb4 at pci0 dev 24 function 3 "AMD AMD64 Misc Cfg" rev 0x00
isa0 at mainbus0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
lm0 at isa0 port 0x290/8: unknown winbond chip ID 0x88
dkcsum: wd0 matches BIOS drive 0x80
dkcsum: wd1 matches BIOS drive 0x81
dkcsum: wd2 matches BIOS drive 0x82
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
dc0: failed to force tx and rx to idle state
dc0: failed to force tx and rx to idle state

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