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Subject2.5 ethernet/irq problem
I'm engaged in an ongoing saga, trying to get at least one of my five 
machines working properly with kernel 2.5. I'll save additional problem
reports until I can make them concrete.

Today's episode involves a KT400 chipset that works fine with recent 2.4
kernels(running 2.4.21-pre3-ac4 right now without any problems).

With 2.5.56, the ethernet cards don't work, while the exact same
hardware/bios options work with with 2.4.

Specifically, I have tried with the onboard realtek (8139too driver) as
well as a 3c59x pci card. Either separately or together, these cards
don't work due to claimed irq problems. Interestingly, /proc/pci reports
wildly different irq settings with 2.5 vs. 2.4 (output of both below).
2.4 maps the pci devices to irqs 16-19, while 2.5 reports them the same
way that the bios post screen reports them (5,10,11, ans 12). These
results are obtained by letting the bios automatically choose the pci
irqs. Different, but equally non-functional results have been obtained
by manually tweaking these bios settings.

Below, you'll find /proc/pci from both kernels as well as the syslog
output that reports irq problems on 2.5. The syslog error comes from the
3c59x card.

-Tupshin

------------------------2.5.56 /proc/pci-------------------------
PCI devices found:
Bus 0, device 0, function 0:
Host bridge: VIA Technologies, In VT8377 [KT400 AGP] H (rev 0).
Master Capable. Latency=8.
Prefetchable 32 bit memory at 0xd0000000 [0xd7ffffff].
Bus 0, device 1, function 0:
PCI bridge: VIA Technologies, In VT8235 PCI Bridge (rev 0).
Master Capable. No bursts. Min Gnt=12.
Bus 0, device 10, function 0:
Multimedia audio controller: Yamaha Corporation YMF-754 [DS-1E
Audio (rev 0).
IRQ 11.
Master Capable. Latency=32. Min Gnt=5.Max Lat=25.
Non-prefetchable 32 bit memory at 0xe3000000 [0xe3007fff].
I/O at 0xd000 [0xd03f].
I/O at 0xd400 [0xd403].
Bus 0, device 11, function 0:
Multimedia video controller: Brooktree Corporatio Bt878 Video
Capture (rev 17).
IRQ 5.
Master Capable. Latency=32. Min Gnt=16.Max Lat=40.
Prefetchable 32 bit memory at 0xe300a000 [0xe300afff].
Bus 0, device 11, function 1:
Multimedia controller: Brooktree Corporatio Bt878 Audio Capture
(rev 17).
IRQ 5.
Master Capable. Latency=32. Min Gnt=4.Max Lat=255.
Prefetchable 32 bit memory at 0xe3008000 [0xe3008fff].
Bus 0, device 13, function 0:
Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Torn (rev 120).
IRQ 10.
Master Capable. Latency=32. Min Gnt=10.Max Lat=10.
I/O at 0xd800 [0xd87f].
Non-prefetchable 32 bit memory at 0xe3009000 [0xe300907f].
Bus 0, device 16, function 0:
USB Controller: VIA Technologies, In USB (rev 128).
IRQ 12.
Master Capable. Latency=32.
I/O at 0xdc00 [0xdc1f].
Bus 0, device 16, function 1:
USB Controller: VIA Technologies, In USB (#2) (rev 128).
IRQ 10.
Master Capable. Latency=32.
I/O at 0xe000 [0xe01f].
Bus 0, device 16, function 2:
USB Controller: VIA Technologies, In USB (#3) (rev 128).
IRQ 11.
Master Capable. Latency=32.
I/O at 0xe400 [0xe41f].
Bus 0, device 17, function 0:
ISA bridge: VIA Technologies, In VT8235 ISA Bridge (rev 0).
Bus 0, device 17, function 1:
IDE interface: VIA Technologies, In VT82C586/B/686A/B PI (rev 6).
IRQ 12.
Master Capable. Latency=32.
I/O at 0xe800 [0xe80f].
Bus 0, device 19, function 0:
Ethernet controller: Realtek Semiconducto RTL-8139/8139C/8139C (rev
16).
IRQ 11.
Master Capable. Latency=32. Min Gnt=32.Max Lat=64.
I/O at 0xec00 [0xecff].
Non-prefetchable 32 bit memory at 0xe300c000 [0xe300c0ff].
Bus 1, device 0, function 0:
VGA compatible controller: ATI Technologies Inc Radeon R200 QL
[Rade (rev 0).
IRQ 12.
Master Capable. Latency=32. Min Gnt=8.
Prefetchable 32 bit memory at 0xd8000000 [0xdfffffff].
I/O at 0xc000 [0xc0ff].
Non-prefetchable 32 bit memory at 0xe1000000 [0xe100ffff].


------------------------2.4.21-pre3-ac4 /proc/pci---------------------

PCI devices found:
Bus 0, device 0, function 0:
Host bridge: VIA Technologies, Inc. VT8377 [KT400 AGP] Host Bridge
(rev 0).
Master Capable. Latency=8.
Prefetchable 32 bit memory at 0xd0000000 [0xd7ffffff].
Bus 0, device 1, function 0:
PCI bridge: VIA Technologies, Inc. VT8235 PCI Bridge (rev 0).
Master Capable. No bursts. Min Gnt=12.
Bus 0, device 10, function 0:
Multimedia audio controller: Yamaha Corporation YMF-754 [DS-1E
Audio Controller] (rev 0).
IRQ 18.
Master Capable. Latency=32. Min Gnt=5.Max Lat=25.
Non-prefetchable 32 bit memory at 0xe3000000 [0xe3007fff].
I/O at 0xd000 [0xd03f].
I/O at 0xd400 [0xd403].
Bus 0, device 11, function 0:
Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 17).
IRQ 19.
Master Capable. Latency=32. Min Gnt=16.Max Lat=40.
Prefetchable 32 bit memory at 0xe300a000 [0xe300afff].
Bus 0, device 11, function 1:
Multimedia controller: Brooktree Corporation Bt878 Audio Capture
(rev 17).
IRQ 19.
Master Capable. Latency=32. Min Gnt=4.Max Lat=255.
Prefetchable 32 bit memory at 0xe3008000 [0xe3008fff].
Bus 0, device 13, function 0:
Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado] (rev
120).
IRQ 17.
Master Capable. Latency=32. Min Gnt=10.Max Lat=10.
I/O at 0xd800 [0xd87f].
Non-prefetchable 32 bit memory at 0xe3009000 [0xe300907f].
Bus 0, device 16, function 0:
USB Controller: VIA Technologies, Inc. USB (rev 128).
IRQ 21.
Master Capable. Latency=32.
I/O at 0xdc00 [0xdc1f].
Bus 0, device 16, function 1:
USB Controller: VIA Technologies, Inc. USB (#2) (rev 128).
IRQ 21.
Master Capable. Latency=32.
I/O at 0xe000 [0xe01f].
Bus 0, device 16, function 2:
USB Controller: VIA Technologies, Inc. USB (#3) (rev 128).
IRQ 21.
Master Capable. Latency=32.
I/O at 0xe400 [0xe41f].
Bus 0, device 17, function 0:
ISA bridge: VIA Technologies, Inc. VT8233A ISA Bridge (rev 0).
Bus 0, device 17, function 1:
IDE interface: VIA Technologies, Inc. VT82C586B PIPC Bus Master IDE
(rev 6).
Master Capable. Latency=32.
I/O at 0xe800 [0xe80f].
Bus 0, device 19, function 0:
Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 16).
IRQ 18.
Master Capable. Latency=32. Min Gnt=32.Max Lat=64.
I/O at 0xec00 [0xecff].
Non-prefetchable 32 bit memory at 0xe300c000 [0xe300c0ff].
Bus 1, device 0, function 0:
VGA compatible controller: ATI Technologies Inc Radeon R200 QL
[Radeon 8500 LE] (rev 0).
IRQ 16.
Master Capable. Latency=32. Min Gnt=8.
Prefetchable 32 bit memory at 0xd8000000 [0xdfffffff].
I/O at 0xc000 [0xc0ff].
Non-prefetchable 32 bit memory at 0xe1000000 [0xe100ffff].

------------------------2.5.56 syslog error---------------------
Jan 13 16:34:31 fussbudget kernel: NETDEV WATCHDOG: eth0: transmit timed out
Jan 13 16:34:31 fussbudget kernel: eth0: transmit timed out, tx_status
00 status e601.
Jan 13 16:34:31 fussbudget kernel: diagnostics: net 0cc6 media 8880
dma 0000003a fifo 0000
Jan 13 16:34:31 fussbudget kernel: eth0: Interrupt posted but not
delivered -- IRQ blocked by another device?
Jan 13 16:34:31 fussbudget kernel: Flags; bus-master 1, dirty 16(0)
current 16(0)
Jan 13 16:34:31 fussbudget kernel: Transmit list 00000000 vs. de0bd200.
Jan 13 16:34:31 fussbudget kernel: 0: @de0bd200 length 8000002a
status 0001002a
Jan 13 16:34:31 fussbudget kernel: 1: @de0bd2a0 length 8000002a
status 0001002a
Jan 13 16:34:31 fussbudget kernel: 2: @de0bd340 length 8000002a
status 0001002a
Jan 13 16:34:31 fussbudget kernel: 3: @de0bd3e0 length 8000002a
status 0001002a
Jan 13 16:34:31 fussbudget kernel: 4: @de0bd480 length 8000002a
status 0001002a
Jan 13 16:34:31 fussbudget kernel: 5: @de0bd520 length 8000002a
status 0001002a
Jan 13 16:34:31 fussbudget kernel: 6: @de0bd5c0 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 7: @de0bd660 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 8: @de0bd700 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 9: @de0bd7a0 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 10: @de0bd840 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 11: @de0bd8e0 length 80000123
status 0c010123
Jan 13 16:34:31 fussbudget kernel: 12: @de0bd980 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 13: @de0bda20 length 8000006e
status 0c01006e
Jan 13 16:34:31 fussbudget kernel: 14: @de0bdac0 length 8000006e
status 8c01006e
Jan 13 16:34:31 fussbudget kernel: 15: @de0bdb60 length 8000006e
status 8c01006e
Jan 13 16:34:31 fussbudget kernel: eth0: Resetting the Tx ring pointer.



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