Hmm. The two machines where I'm seeing this are both Intel-based. One
contains an Intel Q6600 with P45 chipset, running 32-bit Ubuntu 8.04. The
other is an Intel i7-920 with X58 chipset, running 64-bit Ubuntu 9.04.
Of course, it's still possible that the BIOS is blocking access, but it
seems strange that both machines would have the same issue. Is this a
common problem?
Thanks,
Ron
On Thu, 22 Apr 2010, Joyce Yu - System Software wrote:
I got similar problem in the AMD64 based systems. There is a bug in the AMD64
based the system. BIOS blocked any access beyond 256 bytes. I can dump
extended configuration registers in the Intel based system.
Regards,
Joyce
On 04/22/10 02:53 PM, Ron Babich wrote:
Hi all,
I've been trying to get 'lspci -xxxx' to display the extended
configuration registers for one of my devices, without success.
So far, I've only had this problem under Ubuntu, so I originally submitted
this issue to the Ubuntu bug tracker. The details are here:
https://bugs.launchpad.net/ubuntu/+source/pciutils/+bug/563458
I've tried installing the latest version of pciutils from source, with no
change. One thing that might be relevant is that Ubuntu 8.04 ships with a
much newer kernel (2.6.24-27) than the machine I'm comparing against
(CentOS 5.4, kernel version 2.6.18-164), where lspci behaves as expected.
I've tried the various access methods (linux_sysfs, linux_proc, and
intel_conf1), again with no change. If I try to explicitly probe one of
the extended registers (0x180 in this example) using 'sudo setpci -s
01:00.0 180.B', it always prints 'ff', which is the same thing I get if I
do it without root privileges.
For the sake of comparison, I've been looking at the video card in the
above examples, but I'm really interested in figuring this out so that I
can diagnose a chipset configuration problem. Any advice would be much
appreciated.
Thanks,
Ron
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