Re: e100 PCI bridge problem

Thanks for responding. I am very interested to find the source of this problem.

Kok, Auke wrote:

William Montgomery wrote:

In an earlier post to the list I described a hard lockup condition
that occurs on linux kernels 2.4.22, 2.6.13, and 2.6.17 when using
a 4 port 10/100 fast ethernet card. The lockup is easily repeatable
and occurs on 2 out of 3 computers.

Further testing has revealed that the lockup can be prevented on all
computers by making sure the card is installed on the primary PCI bus.
If the card is installed in a slot on the secondary PCI bus (behind a
PCI to PCI bridge) the lockup occurs.


sounds like int-A/B/C/D routing issues

The strange thing is that all the ports on the card work fine for a few minutes, then when some condition (as yet unknown) occurs the system locks up hard. I am currently using a PCI bus analyzer to capture bus activity just prior to the lockup to try and find out what leads up to this condition.


Are there any PCI tuning registers that I can tweak to get around
this problem? Any changes I could make to the e100 driver to fix this?


this issue might be resolvable by quirking the bridgee chips and adjusting any APIC where needed. Unfortunately I don't know much about this but it's physically not possible from the e100 driver. The special (non-intel) card that has these 4 ports onboard contains a bridge chip itself which explains the issues. Even a BIOS issue could be the cause here.

I am aware of the bridge chip on the card but not sure what you mean when you say this explains the issues? I sure would like to figure out a way around this.

The PCI info follows:
00:00.0 Host bridge: Intel Corp. 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 03)
00:02.0 VGA compatible controller: Intel Corp. 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 03)
00:1d.0 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #1 (rev 02)
00:1d.1 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #2 (rev 02)
00:1d.2 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #3 (rev 02)
00:1d.7 USB Controller: Intel Corp. 82801DB (ICH4) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB/ER Hub interface to PCI Bridge (rev 82)
00:1f.0 ISA bridge: Intel Corp. 82801DB (ICH4) LPC Bridge (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801DB (ICH4) Ultra ATA 100 Storage Controller (rev 02)
00:1f.3 SMBus: Intel Corp. 82801DB/DBM (ICH4) SMBus Controller (rev 02)
01:08.0 Ethernet controller: Intel Corp. 82801BD PRO/100 VE (CNR) Ethernet Controller (rev 82)
01:0c.0 PCI bridge: Pericom Semiconductor: Unknown device 8150 (rev 02)
02:06.0 PCI bridge: Hint Corp HB6 Universal PCI-PCI bridge (non-transparent mode) (rev 15)
03:04.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
03:05.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
03:06.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
03:07.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)


Perhaps the linuxfirmwarekit will reveal more information. In any case, fixing this in software would be a gigantic effort.

I will look into that on Monday and report what I find. It seems like it is premature to say how much effort the fix will take since the problem is not yet known? At least not known to me yet. I would just like to find out what parameters on the bridge/bridges might affect this problem and how to modify them.

Auke


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