Messages in this thread | | | Date | Wed, 23 Sep 2009 16:15:18 +0200 | From | Jean Delvare <> | Subject | Re: Crash on reading the whole PCI config of PIIX4 SMBus |
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On Wed, 23 Sep 2009 16:11:45 +0200, Henrik Kretzschmar wrote: > Jean Delvare schrieb: > > You might still want to check if maybe ACPI is interfering with the > > i2c-piix4 driver. This isn't the kind of result I'd expect, but who > > knows. > > > This machine doesnt even have ACPI. :) Just APM. > > But reading the config space may be dangerous, refering the manpage of lspci: > " > -xxx Show hexadecimal dump of the whole PCI configuration space. It > is available only to root as several PCI devices crash when you > try to read some parts of the config space (this behavior proba- > bly doesnt violate the PCI standard, but its at least very > stupid). However, such devices are rare, so you neednt worry > much. > " > > I seem to have stumbled over one of those stupidnesses. > That is the reason why non-root users are only allowed to > read the first 64 byte of the config space.
That's right, but it doesn't explain why i2c-piix4 crashes in the first place, not why merely loading it causes further lspci -xxx to crash when they did not beforehand. I admit I am totally clueless.
> > So its imho generally a good idea to run lspci -xxx on every machine you can > and save some time searching in the wrong places.
-- Jean Delvare
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