Compaq Presario 433 with AMD 5x86 CPU 133MHz Four dmesg for OpenBSD 5.2 follows: 1- GENERIC without disabling anything crash: kernel: protection fault trap, code=0 Stopped at cpu_switchto+0x63: popl %esi 2- GENERIC disabling schsio crash: kernel: protection fault trap, code=0 Stopped at cpu_switchto+0x63: popl %esi 3- GENERIC disabling it crash: kernel: protection fault trap, code=0 Stopped at Xprot: pushl $0x4 4- GENERIC disabling both it and schsio works OpenBSD 5.2 (GENERIC) #278: Wed Aug 1 10:04:16 MDT 2012 deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC cpu0: AMD Am5x86 W/T 133/160 ("AuthenticAMD" 486-class) cpu0: FPU real mem = 20508672 (19MB) avail mem = 9363456 (8MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 12/30/93 pcibios at bios0 function 0x1a not configured bios0: ROM list: 0xc0000/0x8000 cpu0 at mainbus0: (uniprocessor) isa0 at mainbus0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16450, no fifo com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo com1: probed fifo depth: 0 bytes pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard vga0 at isa0 port 0x3b0/48 iomem 0xa0000/131072 wsdisplay0 at vga0 mux 1: console (80x25, vt100 emulation), using wskbd0 wsdisplay0: screen 1-5 added (80x25, vt100 emulation) wdc0 at isa0 port 0x1f0/8 irq 14 wd0 at wdc0 channel 0 drive 0: wd0: 16-sector PIO, LBA48, 114473MB, 234441648 sectors wd0(wdc0:0:0): using BIOS timings ne2 at isa0 port 0x280/32 irq 9, NE2000 (RTL8019), address 00:60:67:25:b8:b8 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets kernel: protection fault trap, code=0 Stopped at cpu_switchto+0x63: popl %esi ddb> PID PPID PGRP UID S FLAGS WAIT COMMAND 6 0 0 0 2 0x100200 crypto 5 0 0 0 2 0x100200 pfpurge 4 0 0 0 2 0x100200 syswq 3 0 0 0 2 0x100200 idle0 2 0 0 0 2 0x100200 kmthread * 1 0 0 0 7 0 swapper 0 -1 0 0 3 0x200 wdccmd swapper ddb> cpu_switchto(d0d62000,0,d0365df0,d0d62000,d0ba9ee4,d0d62014,d0c489e0,d0d62364) at cpu_switchto+0x63 sr_attach(0,d0d62000,0,d09c1a60,0) at sr_attach+0x13c config_attach(0,d09c1a60,0,0,0) at config_attach+0x1bb config_rootfound(d08b88dd,0,1,0,0) at config_rootfound+0x46 main(d02004cd,d02004d5,0,0,0) at main+0x560 ddb> No such command ddb> rebooting... OpenBSD 5.2 (GENERIC) #278: Wed Aug 1 10:04:16 MDT 2012 deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC cpu0: AMD Am5x86 W/T 133/160 ("AuthenticAMD" 486-class) cpu0: FPU real mem = 20508672 (19MB) avail mem = 9363456 (8MB) User Kernel Config UKC> disable schsio 303 schsio* disabled 304 schsio* disabled 305 schsio* disabled 306 schsio* disabled UKC> quit Continuing... mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 12/30/93 pcibios at bios0 function 0x1a not configured bios0: ROM list: 0xc0000/0x8000 cpu0 at mainbus0: (uniprocessor) isa0 at mainbus0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16450, no fifo com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo com1: probed fifo depth: 0 bytes pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard vga0 at isa0 port 0x3b0/48 iomem 0xa0000/131072 wsdisplay0 at vga0 mux 1: console (80x25, vt100 emulation), using wskbd0 wsdisplay0: screen 1-5 added (80x25, vt100 emulation) wdc0 at isa0 port 0x1f0/8 irq 14 wd0 at wdc0 channel 0 drive 0: wd0: 16-sector PIO, LBA48, 114473MB, 234441648 sectors wd0(wdc0:0:0): using BIOS timings ne2 at isa0 port 0x280/32 irq 9, NE2000 (RTL8019), address 00:60:67:25:b8:b8 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets kernel: protection fault trap, code=0 Stopped at cpu_switchto+0x63: popl %esi ddb> PID PPID PGRP UID S FLAGS WAIT COMMAND 6 0 0 0 2 0x100200 crypto 5 0 0 0 2 0x100200 pfpurge 4 0 0 0 2 0x100200 syswq 3 0 0 0 2 0x100200 idle0 2 0 0 0 2 0x100200 kmthread * 1 0 0 0 7 0 swapper 0 -1 0 0 3 0x200 wdccmd swapper ddb> cpu_switchto(d0d62000,0,d0365df0,d0d62000,d0ba9ee4,d0d62014,d0c489f0,d0d62364) at cpu_switchto+0x63 sr_attach(0,d0d62000,0,d09c1a60,0) at sr_attach+0x13c config_attach(0,d09c1a60,0,0,0) at config_attach+0x1bb config_rootfound(d08b88dd,0,1,0,0) at config_rootfound+0x46 main(d02004cd,d02004d5,0,0,0) at main+0x560 ddb> rebooting... OpenBSD 5.2 (GENERIC) #278: Wed Aug 1 10:04:16 MDT 2012 deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC cpu0: AMD Am5x86 W/T 133/160 ("AuthenticAMD" 486-class) cpu0: FPU real mem = 20508672 (19MB) avail mem = 9363456 (8MB) User Kernel Config UKC> disable it 315 it* disabled 316 it* disabled UKC> quit Continuing... mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 12/30/93 pcibios at bios0 function 0x1a not configured bios0: ROM list: 0xc0000/0x8000 cpu0 at mainbus0: (uniprocessor) isa0 at mainbus0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16450, no fifo com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo com1: probed fifo depth: 0 bytes pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard vga0 at isa0 port 0x3b0/48 iomem 0xa0000/131072 wsdisplay0 at vga0 mux 1: console (80x25, vt100 emulation), using wskbd0 wsdisplay0: screen 1-5 added (80x25, vt100 emulation) wdc0 at isa0 port 0x1f0/8 irq 14 wd0 at wdc0 channel 0 drive 0: wd0: 16-sector PIO, LBA48, 114473MB, 234441648 sectors wd0(wdc0:0:0): using BIOS timings ne2 at isa0 port 0x280/32 irq 9, NE2000 (RTL8019), address 00:60:67:25:b8:b8 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets kernel: protection fault trap, code=0 Stopped at Xprot: pushl $0x4 ddb> PID PPID PGRP UID S FLAGS WAIT COMMAND 6 0 0 0 2 0x100200 crypto 5 0 0 0 2 0x100200 pfpurge 4 0 0 0 2 0x100200 syswq 3 0 0 0 2 0x100200 idle0 2 0 0 0 2 0x100200 kmthread * 1 0 0 0 7 0 swapper 0 -1 0 0 3 0x200 wdccmd swapper ddb> Xprot(d02008af,d1410008,10282,d03cff50,d1412000,d02004d8,0,d02004d5) at Xprot start(d0d62000,0,d0365df0,d0d62000,d0ba9ee4,d0d62014,d0c489f0,d0d62364) at start+0xe3 sr_attach(0,d0d62000,0,d09c1a60,0) at sr_attach+0x13c config_attach(0,d09c1a60,0,0,0) at config_attach+0x1bb config_rootfound(d08b88dd,0,1,0,0) at config_rootfound+0x46 main(d02004cd,d02004d5,0,0,0) at main+0x560 ddb> rebooting... OpenBSD 5.2 (GENERIC) #278: Wed Aug 1 10:04:16 MDT 2012 deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC cpu0: AMD Am5x86 W/T 133/160 ("AuthenticAMD" 486-class) cpu0: FPU real mem = 20508672 (19MB) avail mem = 9363456 (8MB) User Kernel Config UKC> disable it 315 it* disabled 316 it* disabled UKC> disable schsio 303 schsio* disabled 304 schsio* disabled 305 schsio* disabled 306 schsio* disabled UKC> quit Continuing... mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 12/30/93 pcibios at bios0 function 0x1a not configured bios0: ROM list: 0xc0000/0x8000 cpu0 at mainbus0: (uniprocessor) isa0 at mainbus0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16450, no fifo com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo com1: probed fifo depth: 0 bytes pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard vga0 at isa0 port 0x3b0/48 iomem 0xa0000/131072 wsdisplay0 at vga0 mux 1: console (80x25, vt100 emulation), using wskbd0 wsdisplay0: screen 1-5 added (80x25, vt100 emulation) wdc0 at isa0 port 0x1f0/8 irq 14 wd0 at wdc0 channel 0 drive 0: wd0: 16-sector PIO, LBA48, 114473MB, 234441648 sectors wd0(wdc0:0:0): using BIOS timings ne2 at isa0 port 0x280/32 irq 9, NE2000 (RTL8019), address 00:60:67:25:b8:b8 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets root on wd0a (05478d6b06c9277c.a) swap on wd0b dump on wd0b