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PC 750 PCI/MCA and Linux 2.4

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Date: Sun, 21 Jan 2024 03:44:51 -0800 (PST)
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Subject: PC 750 PCI/MCA and Linux 2.4
From: google@holzapfel.biz (Christian Holzapfel)
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by: Christian Holzapfel - Sun, 21 Jan 2024 11:44 UTC

Desperately trying to set up my PCI/MCA PC 750 with Debian Sarge (3.1) and a 2.4.27 Linux kernel.
With out-of-the-box and custom kernels, the MCA bus is detected at startup, but no devices are accessible. /proc/mca/pos shows all FF FF for adapter IDs, and MCA adapter drivers don't find any devices.

If I set kernel cmdline to pci=off or pci=nobios, the MCA bus is still detected at startup, and devices become accessible.
But now, /proc/pci is empty, and PCI devices are unavailable!
lspci shows the device anyway, but some are not working anymore.
The Matrox VGA card works with XFree 4 anyway (why?), but the PCnet32 PCI ethernet card is not enumerated.

The trouble must come from the PCI/MCA bridge and the 2.4 kernel code somehow.
Booting the same system with Debian Potato (2.2) and a 2.2 kernel gives me both PCI and MCA buses.

Any way to make the 2.4 kernel recognize both PCI and MCA on that system?

No one wants war. -- Kirk, "Errand of Mercy", stardate 3201.7

computers / comp.sys.ibm.ps2.hardware / PC 750 PCI/MCA and Linux 2.4

Subject	Author
PC 750 PCI/MCA and Linux 2.4	Christian Holzapfel