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Subjectspurious 8259A interrupt?
Periodically, I get the following error with the 2.4.0test9 kernel:

spurious 8259A interrupt: IRQ7.

I did not receive this error with the 2.0.36 kernel that came stock on my
slack installation. However, 2 things have been changed; I configured the
PAS16 to use IRQ7 (I don't recall its exact configuration, so I *roughly*
guessed) and I configured the cdrom drive in the system, a CR-522.

I'll try and post all relevant information, since I don't know what is
important here (and it could just be a simple configuration error.)
Still, unless I'm mistaken, isn't an 8259A a UART, which should be related
to the serial port? Seems odd it would show up on IRQ 7...

DanL

dmesg output:
Linux version 2.4.0-test9 (lange92@aries) (gcc version 2.95.2 20000220
(Debian G
NU/Linux)) #2 Mon Oct 9 01:44:44 CDT 2000
BIOS-provided physical RAM map:
BIOS-88: 000000000009f000 @ 0000000000000000 (usable)
BIOS-88: 0000000000700000 @ 0000000000100000 (usable)
On node 0 totalpages: 2048
zone(0): 2048 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: BOOT_IMAGE=2.4 ro root=302 sbpcd=0x300,Lasermate
Initializing CPU#0
Console: colour VGA+ 80x25
Calibrating delay loop... 3.10 BogoMIPS
Memory: 5896k/8192k available (1377k kernel code, 1908k reserved, 80k
data, 56k
init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor
mode... No.
Dentry-cache hash table entries: 1024 (order: 1, 8192 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: 386
Checking 'hlt' instruction... OK.
Checking for popad bug... Buggy.
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 512 bind 512)
Starting kswapd v1.8
pty: 256 Unix98 ptys configured
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: enabling 8 loop devices
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 50MHz system bus speed for PIO modes; override with
idebus=xx
hda: Maxtor 7131 AT, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: 256512 sectors (131 MB) w/64KiB Cache, CHS=1002/8/32
Partition check:
hda: hda1 hda2
Floppy drive(s): fd0 is 1.2M, fd1 is 1.44M
FDC 0 is an 8272A
Init failed. No mcd device at 0x300 irq 11
mcdx Version 2.14(hs)
mcdx $Id: mcdx.c,v 1.21 1997/01/26 07:12:59 davem Exp $
mcdx mcdx=0x300,11: Init failed. Can't get version.
sbpcd-0 [01]: sbpcd.c v4.63 Andrew J. Kroll <ag784@freenet.buffalo.edu>
Wed Jul
26 04:24:10 EDT 2000
sbpcd-0 [02]: Scanning 0x300 (LaserMate)...
sbpcd-0 [03]: Drive 0 (ID=0): CR-52x (2.11) at 0x300 (type 0)
Uniform CD-ROM driver Revision: 3.11
ne.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)
NE*000 ethercard probe at 0x280: 00 00 e8 78 b7 31
eth0: NE2000 found at 0x280, using IRQ 11.
Serial driver version 5.02 (2000-08-09) with no serial options enabled
ttyS00 at 0x03f8 (irq = 4) is a 16450
ttyS01 at 0x02f8 (irq = 3) is a 16550A
ttyS03 at 0x02e8 (irq = 3) is a 16450
[drm] Initialized tdfx 1.0.0 20000928 on minor 63
Pro Audio Spectrum driver Copyright (C) by Hannu Savolainen 1993-1996
I/O, IRQ, DMA and type are mandatory
kmem_create: Forcing size word alignment - nfs_fh
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 56k freed
spurious 8259A interrupt: IRQ7.
/proc/cmdline
BOOT_IMAGE=2.4 ro root=302 sbpcd=0x300,Lasermate

/proc/cpuinfo
processor : 0
vendor_id : unknown
cpu family : 3
model : 0
model name : unknown
stepping : unknown
fdiv_bug : no
hlt_bug : no
sep_bug : no
f00f_bug : no
coma_bug : no
fpu : no
fpu_exception : no
cpuid level : -1
wp : no
flags :
bogomips : 3.10

/proc/interrupts
CPU0
0: 5320892 XT-PIC timer
1: 1113 XT-PIC keyboard
2: 0 XT-PIC cascade
11: 4312 XT-PIC NE2000
13: 0 XT-PIC fpu
14: 22070 XT-PIC ide0
NMI: 0
ERR: 1

/proc/devices
Character devices:
1 mem
2 pty
3 ttyp
4 ttyS
5 cua
7 vcs
10 misc
14 sound
128 ptm
136 pts
162 raw

Block devices:
1 ramdisk
2 fd
3 ide0
7 loop
25 sbpcd

/proc/ioports
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
01f0-01f7 : ide0
0280-029f : NE2000
02e8-02ef : serial(auto)
02f8-02ff : serial(auto)
0300-0303 : sbpcd
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(auto)
/proc/iomem
00000000-0009efff : System RAM
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-007fffff : System RAM
00100000-00258447 : Kernel code
00258448-0026c5a3 : Kernel data
/proc/dma
4: cascade

../linux/.config
(edited for brevity; all other options are not set)
CONFIG_X86=y
CONFIG_ISA=y
CONFIG_UID16=y
CONFIG_MODULES=y
CONFIG_M386=y
CONFIG_X86_L1_CACHE_BYTES=16
CONFIG_NOHIGHMEM=y
CONFIG_MATH_EMULATION=y
CONFIG_NET=y
CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_KCORE_ELF=y
CONFIG_BINFMT_AOUT=y
CONFIG_BINFMT_ELF=y
CONFIG_BINFMT_MISC=y
CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=4096
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IDE=y
CONFIG_BLK_DEV_IDE=y
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_BLK_DEV_IDECD=y
CONFIG_BLK_DEV_CMD640=y
CONFIG_BLK_DEV_IDE_MODES=y
CONFIG_NETDEVICES=y
CONFIG_DUMMY=m
CONFIG_NET_ETHERNET=y
CONFIG_NET_ISA=y
CONFIG_NE2000=y
CONFIG_CD_NO_IDESCSI=y
CONFIG_SBPCD=y
CONFIG_MCD=y
CONFIG_MCD_IRQ=11
CONFIG_MCD_BASE=300
CONFIG_MCDX=y
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=256
CONFIG_DRM=y
CONFIG_DRM_TDFX=y
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_ISO9660_FS=y
CONFIG_MINIX_FS=y
CONFIG_PROC_FS=y
CONFIG_DEVPTS_FS=y
CONFIG_EXT2_FS=y
CONFIG_NFS_FS=y
CONFIG_SUNRPC=y
CONFIG_LOCKD=y
CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_VGA_CONSOLE=y
CONFIG_VIDEO_SELECT=y
CONFIG_SOUND=y
CONFIG_SOUND_OSS=y
CONFIG_SOUND_PAS=y
CONFIG_MAGIC_SYSRQ=y


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