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SubjectISAPNP using an invalid IRQ, 2.4.0-test7
With default BIOS settings, IRQ 5 is unavailable for ISA yet
it is being assigned by the ne.c driver and NFS root system
doesn't finish booting.

Is this a driver problem or a ISAPNP problem?

I changed drivers/pnp/isapnp.c to switch IRQ 5 & 9 to temporarily
work around this problem, is there a better solution?
Maybe, mask out the interrupts that aren't provided by the BIOS when
reading this table?

static int isapnp_valid_irq(struct isapnp_cfgtmp *cfg, int idx)
{
/* IRQ priority: this table is good for i386 */
static unsigned short xtab[16] = {
- 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
+ 9, 10, 11, 12, 5, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
};


Here is a diff -u of dmesg's with and without "Assign IRQ for VGA" set
in the BIOS. Don't know if it will be useful.

System is an ABIT BP6 dual 466's w/QQ bios, ~OC.

Martin

--- dmesg.vgairq Mon Aug 28 23:32:50 2000
+++ dmesg.novgairq Sat Aug 26 22:27:31 2000
@@ -42,6 +42,7 @@
Int: type 0, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 02
Int: type 0, pol 0, trig 0, bus 2, IRQ 03, APIC ID 2, APIC INT 03
Int: type 0, pol 0, trig 0, bus 2, IRQ 04, APIC ID 2, APIC INT 04
+Int: type 0, pol 0, trig 0, bus 2, IRQ 05, APIC ID 2, APIC INT 05
Int: type 0, pol 0, trig 0, bus 2, IRQ 06, APIC ID 2, APIC INT 06
Int: type 0, pol 0, trig 0, bus 2, IRQ 07, APIC ID 2, APIC INT 07
Int: type 0, pol 1, trig 1, bus 2, IRQ 08, APIC ID 2, APIC INT 08
@@ -53,7 +54,6 @@
Int: type 0, pol 3, trig 3, bus 0, IRQ 1f, APIC ID 2, APIC INT 13
Int: type 0, pol 3, trig 3, bus 0, IRQ 4c, APIC ID 2, APIC INT 12
Int: type 0, pol 3, trig 3, bus 0, IRQ 4d, APIC ID 2, APIC INT 12
-Int: type 0, pol 3, trig 3, bus 1, IRQ 00, APIC ID 2, APIC INT 10
Int: type 2, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 17
Lint: type 3, pol 0, trig 0, bus 0, IRQ 00, APIC ID ff, APIC LINT 00
Lint: type 1, pol 0, trig 0, bus 0, IRQ 00, APIC ID ff, APIC LINT 01
@@ -126,7 +126,7 @@
...changing IO-APIC physical APIC ID to 2 ... ok.
Synchronizing Arb IDs.
init IO_APIC IRQs
- IO-APIC (apicid-pin) 2-0, 2-5, 2-10, 2-11, 2-17, 2-20, 2-21, 2-22, 2-23 not connected.
+ IO-APIC (apicid-pin) 2-0, 2-10, 2-11, 2-16, 2-17, 2-20, 2-21, 2-22, 2-23 not connected.
..TIMER: vector=49 pin1=2 pin2=0
activating NMI Watchdog ... done.
number of MP IRQ sources: 18.
@@ -148,18 +148,18 @@
02 003 03 0 0 0 0 0 1 1 31
03 003 03 0 0 0 0 0 1 1 41
04 003 03 0 0 0 0 0 1 1 49
- 05 000 00 1 0 0 0 0 0 0 00
- 06 003 03 0 0 0 0 0 1 1 51
- 07 003 03 0 0 0 0 0 1 1 59
- 08 003 03 0 0 0 0 0 1 1 61
- 09 003 03 0 0 0 0 0 1 1 69
+ 05 003 03 0 0 0 0 0 1 1 51
+ 06 003 03 0 0 0 0 0 1 1 59
+ 07 003 03 0 0 0 0 0 1 1 61
+ 08 003 03 0 0 0 0 0 1 1 69
+ 09 003 03 0 0 0 0 0 1 1 71
0a 000 00 1 0 0 0 0 0 0 00
0b 000 00 1 0 0 0 0 0 0 00
- 0c 003 03 0 0 0 0 0 1 1 71
+ 0c 003 03 0 0 0 0 0 1 1 79
0d 000 00 1 0 0 0 0 0 0 00
- 0e 003 03 0 0 0 0 0 1 1 79
- 0f 003 03 0 0 0 0 0 1 1 81
- 10 003 03 1 1 0 1 0 1 1 89
+ 0e 003 03 0 0 0 0 0 1 1 81
+ 0f 003 03 0 0 0 0 0 1 1 89
+ 10 000 00 1 0 0 0 0 0 0 00
11 000 00 1 0 0 0 0 0 0 00
12 003 03 1 1 0 1 0 1 1 91
13 003 03 1 1 0 1 0 1 1 99
@@ -172,6 +172,7 @@
IRQ1 -> 1
IRQ3 -> 3
IRQ4 -> 4
+IRQ5 -> 5
IRQ6 -> 6
IRQ7 -> 7
IRQ8 -> 8
@@ -180,7 +181,6 @@
IRQ13 -> 13
IRQ14 -> 14
IRQ15 -> 15
-IRQ16 -> 16
IRQ18 -> 18
IRQ19 -> 19
.................................... done.
@@ -202,7 +202,6 @@
PCI->APIC IRQ transform: (B0,I7,P3) -> 19
PCI->APIC IRQ transform: (B0,I19,P0) -> 18
PCI->APIC IRQ transform: (B0,I19,P1) -> 18
-PCI->APIC IRQ transform: (B1,I0,P0) -> 16
Limiting direct PCI/PCI transfers.
isapnp: Scanning for Pnp cards...
isapnp: Card 'SMC EZ Card (1660)'
-
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