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PCI bridge setup error in linux-2.4.x (anyone of them)

DISCUSSION Martin Dalecki 2 participants 2 messages Jun 29, 2001

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Martin Dalecki

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I ahve a PC box at hand, which ist containing 8 PCI slots. Four of them are sitting behind a PCI bridge.
The error in the new kernel series is that during the PCI bus setup if a card is sitting behind the bridge, it will be miracelously detected TWICE. Once in front of the bridge and once behind the bridge. The initialisation of the card will then be entierly hossed.

This00:02.0 PCI bridge: Intel Corporation 80960RP [i960 RP Microprocessor/Bridge] (rev 03)
00:02.1 I2O: Intel Corporation 80960RP [i960RP Microprocessor] (rev 03) 00:03.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 02) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 00:06.0 System peripheral: Hewlett-Packard Company NetServer Smart IRQ Router (rev a0)
00:08.0 VGA compatible controller: Cirrus Logic GD 5446 (rev 45) 00:0f.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02) 00:0f.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01) 00:0f.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01) 00:0f.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02) 00:10.0 Host bridge: Intel Corporation 450NX - 82451NX Memory & I/O Controller (rev 03)
00:12.0 Host bridge: Intel Corporation 450NX - 82454NX PCI Expander Bridge (rev 02)
02:04.0 Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink] (rev 74)
oops:~ #
doesn't happen under linux-2.2.x kernel series.

Here is the output of lspci on this box after I moved the card in front of the bridge:

#1 lore raw
Quoted 20 lines · Martin Dalecki

I ahve a PC box at hand, which ist containing 8 PCI slots. Four of them are sitting behind a PCI bridge.
The error in the new kernel series is that during the PCI bus setup if a card is sitting behind the bridge, it will be miracelously detected TWICE. Once in front of the bridge and once behind the bridge. The initialisation of the card will then be entierly hossed.

This00:02.0 PCI bridge: Intel Corporation 80960RP [i960 RP Microprocessor/Bridge] (rev 03)
00:02.1 I2O: Intel Corporation 80960RP [i960RP Microprocessor] (rev 03) 00:03.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 02) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 00:06.0 System peripheral: Hewlett-Packard Company NetServer Smart IRQ Router (rev a0)
00:08.0 VGA compatible controller: Cirrus Logic GD 5446 (rev 45) 00:0f.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02) 00:0f.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01) 00:0f.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01) 00:0f.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)

Quoted 9 lines

00:10.0 Host bridge: Intel Corporation 450NX - 82451NX Memory & I/O Controller (rev 03)
00:12.0 Host bridge: Intel Corporation 450NX - 82454NX PCI Expander Bridge (rev 02)
02:04.0 Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink] (rev 74)
oops:~ #
doesn't happen under linux-2.2.x kernel series.

I have an ITI-4280UE multifunction card (two Symbios Logic 875's and a DEC21140 fast ethernet) which also has such a bridge (rev 02, even) and have noticed nothing wrong until 2.4.5-ac19 (haven't tested further).

Jurriaan

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