Subject: Optimization parameters when compiling kernel
To: None <current-users@NetBSD.ORG>
From: Martin Husemann <>
List: current-users
Date: 08/28/1999 16:05:05
Since we had that discussion about optimization on kernel builds, I just
found an obscure bug: when I compile a kernel with "-O3 -m686" the pciide
driver finds a second drive on controller 0 (which is not there) and the
kernel never finishes boot since this phantom drive doesn't react as

With -O2 it works fine (dmesg attached below).


(This is current from about a week ago...)

NetBSD 1.4K (RUMOLT) #2: Sat Aug 28 15:39:09 MEST 1999
cpu0: family 6 model 5 step 3
cpu0: Intel Pentium II (Deschutes) (686-class)
total memory = 255 MB
avail memory = 235 MB
using 2822 buffers containing 13184 KB of memory
mainbus0 (root)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o enabled, memory enabled
pchb0 at pci0 dev 0 function 0
pchb0: vendor 0x8086 product 0x7190 (rev. 0x03)
ppb0 at pci0 dev 1 function 0: vendor 0x8086 product 0x7191 (rev. 0x03)
pci1 at ppb0 bus 1
pci1: i/o enabled, memory enabled
vga0 at pci1 dev 0 function 0: vendor 0x10de product 0x0028 (rev. 0x11)
wsdisplay0 at vga0: console (80x25, vt100 emulation)
pcib0 at pci0 dev 7 function 0
pcib0: vendor 0x8086 product 0x7110 (rev. 0x02)
pciide0 at pci0 dev 7 function 1: Intel 82371AB IDE controller (PIIX4)
pciide0: bus-master DMA support present
pciide0: primary channel wired to compatibility mode
wd0 at pciide0 channel 0 drive 0: <IBM-DTTA-371440>
wd0: drive supports 16-sector pio transfers, lba addressing
wd0: 13783MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 28229040 sectors
wd0: 32-bits data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2
pciide0: primary channel interrupting at irq 14
pciide0: secondary channel wired to compatibility mode
pciide0: disabling secondary channel (no drives)
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (using DMA data transfers)
uhci0 at pci0 dev 7 function 2: vendor 0x8086 product 0x7112 (rev. 0x01)
uhci0: interrupting at irq 11
uhci0: USB version 1.0
usb0 at uhci0
uhub0 at usb0
uhub0: vendor 0x8086 UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
vendor 0x8086 product 0x7113 (miscellaneous bridge, revision 0x02) at pci0 dev 7 function 3 not configured
vr0 at pci0 dev 11 function 0: VIA VT3043 (Rhine) 10/100 Ethernet
vr0: interrupting at irq 11
vr0: Ethernet address: 00:80:c8:f9:e4:37
ukphy0 at vr0 phy 8: Generic IEEE 802.3u media interface
ukphy0: OUI 0x006040, model 0x0000, rev. 0
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
isa0 at pcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
lpt0 at isa0 port 0x378-0x37b irq 7
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff: using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
isapnp0: read port 0x203
isic0 at isapnp0 port 0x160/8 irq 5: Elsa QuickStep 1000 (ISA)
isic0: ISAC 2085 Version A1/A2 or 2086/2186 Version 1.1 (IOM-2)
isic0: HSCX 82525 or 21525 Version 2.1
sb0 at isapnp0 port 0x220/16,0x330/2,0x388/4 irq 5 drq 1,3
sb0: Creative ViBRA16X PnP Audio: dsp v4.16
audio0 at sb0: half duplex
mpu0 at sb0
midi0 at mpu0: <SB MPU-401 MIDI UART>
opl0 at sb0: model OPL3
midi1 at opl0: <SB Yamaha OPL3>
joy0 at isapnp0 port 0x201/1
joy0: Creative ViBRA16X PnP Game
joy0: joystick not connected
apm0 at mainbus0: Power Management spec V1.2 (slowidle)
apm0: A/C state: on
apm0: battery charge state: no battery
biomask 4840 netmask 4860 ttymask 48e2
i4b: ISDN call control device attached
i4btrc: 2 ISDN trace device(s) attached
i4bctl: ISDN system control port attached
i4brbch: 4 raw B channel access device(s) attached
i4btel: 2 ISDN telephony interface device(s) attached
i4bipr: 2 IP over raw HDLC ISDN device(s) attached (VJ header compression)
i4bisppp: 2 ISDN SyncPPP device(s) attached
boot device: wd0
root on wd0a dumps on wd0b
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)