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Subjectwhat is pci=biosirq
I have an ALi chipset motherboard that seems to function normally.  K6-2
450, 256mb ram, 20gb ide fujitsu hard disk. Every time I boot up I get
this unsettling message about PCI: No IRQ known for interrupt pin A of
device 00:0f.0. Please try using pci=biosirq.

It turns out that 00:0f.0 is my ALi ide controller: 00:0f.0 IDE
interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev c1)

Is this normal, or what should I do to "fix" it? Changing plug and play
OS in the bios has no effect.

dmesg and lspci follow:

Linux version 2.4.3 (root@coffee) (gcc version 2.95.3 20010315 (release))
#2 Sat Mar 31 17:50:50 PST 2001
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000000fffc000 (usable)
BIOS-e820: 000000000fffc000 - 000000000ffff000 (ACPI data)
BIOS-e820: 000000000ffff000 - 0000000010000000 (ACPI NVS)
BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
On node 0 totalpages: 65532
zone(0): 4096 pages.
zone(1): 61436 pages.
zone(2): 0 pages.
Kernel command line:
Initializing CPU#0
Detected 451.019 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 901.12 BogoMIPS
Memory: 255860k/262128k available (826k kernel code, 5880k reserved, 271k
data, 176k init, 0k highmem)
Dentry-cache hash table entries: 32768 (order: 6, 262144 bytes)
Buffer-cache hash table entries: 16384 (order: 4, 65536 bytes)
Page-cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 16384 (order: 5, 131072 bytes)
CPU: Before vendor init, caps: 008021bf 808029bf 00000000, vendor = 2
CPU: L1 I Cache: 32K (32 bytes/line), D cache 32K (32 bytes/line)
CPU: After vendor init, caps: 008021bf 808029bf 00000000 00000002
CPU: After generic, caps: 008021bf 808029bf 00000000 00000002
CPU: Common caps: 008021bf 808029bf 00000000 00000002
CPU: AMD-K6(tm) 3D processor stepping 0c
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.37 (20001109) Richard Gooch (
mtrr: detected mtrr type: AMD K6
PCI: PCI BIOS revision 2.10 entry at 0xf0720, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Using IRQ router ALI [10b9/1533] at 00:07.0
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd v1.8
pty: 512 Unix98 ptys configured
block: queued sectors max/low 170010kB/56670kB, 512 slots per queue
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with
ALI15X3: IDE controller on PCI bus 00 dev 78
PCI: No IRQ known for interrupt pin A of device 00:0f.0. Please try using
ALI15X3: chipset revision 193
ALI15X3: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xb000-0xb007, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xb008-0xb00f, BIOS settings: hdc:pio, hdd:pio
hda: FUJITSU MPF3204AT, ATA DISK drive
ide: Assuming 33MHz system bus speed for PIO modes; override with
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 40031712 sectors (20496 MB) w/512KiB Cache, CHS=2491/255/63, UDMA(33)
Partition check:
hda: hda1 hda2 < hda5 hda6 > hda3 hda4
Serial driver version 5.05 (2000-12-13) with MANY_PORTS SHARE_IRQ
SERIAL_PCI enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
PPP generic driver version 2.4.1
PPP Deflate Compression module registered
PPP BSD Compression module registered
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 2048 buckets, 16Kbytes
TCP: Hash tables configured (established 16384 bind 16384)
ip_tables: (c)2000 Netfilter core team
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
cryptoapi: Registered sha1 (0)
cryptoapi: Registered rijndael-ecb (0)
cryptoapi: Registered rijndael-cbc (65536)
cryptoapi: Registered aes-ecb (0)
cryptoapi: Registered aes-cbc (65536)
cryptoapi: Registered blowfish-ecb (0)
cryptoapi: Registered blowfish-cbc (65536)
cryptoapi: Registered des-ecb (0)
cryptoapi: Registered des-cbc (65536)
cryptoapi: Registered des_ede3-ecb (0)
cryptoapi: Registered des_ede3-cbc (65536)
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 176k freed
Adding Swap: 128516k swap-space (priority -1)
PCI: Found IRQ 3 for device 00:09.0
3c59x.c:LK1.1.13 27 Jan 2001 Donald Becker and others.
See Documentation/networking/vortex.txt
eth0: 3Com PCI 3c900 Boomerang 10baseT at 0xb800, 00:60:97:c7:a6:82, IRQ
product code 4843 rev 00.0 date 09-07-00
8K word-wide RAM 3:5 Rx:Tx split, autoselect/10baseT interface.
Enabling bus-master transmits and whole-frame receives.
eth0: scatter/gather enabled. h/w checksums disabled
Real Time Clock Driver v1.10d
inserting floppy driver for 2.4.3
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
loop: loaded (max 8 devices)
hdc: set_drive_speed_status: status=0x40 { DriveReady }
hdc: ATAPI 20X CD-ROM CD-R/RW drive, 2048kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12
usb.c: registered new driver hub
PCI: Found IRQ 7 for device 00:02.0
PCI: Setting latency timer of device 00:02.0 to 64
usb-ohci.c: USB OHCI at membase 0xd084f000, IRQ 7
usb-ohci.c: usb-00:02.0, Acer Laboratories Inc. [ALi] M5237 USB
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
hub.c: 2 ports detected
es1370: version v0.34 time 17:48:44 Mar 31 2001
PCI: Found IRQ 10 for device 00:0a.0
es1370: found adapter at io 0xb400 irq 10
es1370: features: joystick on, line in, mic impedance 0
gameport0: NS558 ISA at 0x200 size 8 speed 1125 kHz
js0: Joystick device for input0
event0: Event device for input0
input0: Gravis Xterminator Digital on gameport0.0
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 203M
agpgart: Detected Ali M1541 chipset
agpgart: AGP aperture is 64M @ 0xe0000000
[drm] AGP 0.99 on ALi M1541 @ 0xe0000000 64MB
[drm] Initialized tdfx 1.0.0 20000928 on minor 63
eth0: first available media type: 10baseT

00:00.0 Host bridge: Acer Laboratories Inc. [ALi] M1541 (rev 04)
00:01.0 PCI bridge: Acer Laboratories Inc. [ALi] M5243 (rev 04)
00:02.0 USB Controller: Acer Laboratories Inc. [ALi] M5237 USB (rev 03)
00:03.0 Bridge: Acer Laboratories Inc. [ALi] M7101 PMU
00:07.0 ISA bridge: Acer Laboratories Inc. [ALi] M1533 PCI to ISA Bridge
[Aladdin IV] (rev c3)
00:09.0 Ethernet controller: 3Com Corporation 3c900 10BaseT [Boomerang]
00:0a.0 Multimedia audio controller: Ensoniq ES1370 [AudioPCI]
00:0f.0 IDE interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev c1)
01:00.0 VGA compatible controller: 3Dfx Interactive, Inc. Voodoo 3 (rev

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