Re: [linux-usb-devel] Re: ATI RS480-based motherboard: stuck while booting with kernel >= 2.6.15 rc1

["Carlo E. Prelz" <fluido@fluido.as>]

	Subject: Re: [linux-usb-devel] Re: ATI RS480-based motherboard: stuck while booting with kernel >= 2.6.15 rc1
	Date: dom 05 feb 06 11:45:22 -0800

Quoting David Brownell (david-b@pacbell.net):

> Interesting ... feels like a BIOS problem.  If you want to experiment,
> there's a right bracket -- "}" -- immediately before that.  Try moving
> it right after that write, so that write_config_byte is covered by the
> preceding "if LEGSUP_BIOS" test; or copying the much later "disable SMI"
> clause into an "else" for that "if".

The first one would be useless - I inserted lots of printouts to find
out where the freeze took place, and I know that the 
EHCI_USBLEGSUP_BIOS flag is on (cap is 0x10001). The value remains the
same after the 'spin till it hands it over' loop - so that this
printout appears:

0000:00:13.2 EHCI: BIOS handoff failed (BIOS bug ?)

About the second thing you suggest: do you refer to this call?

			/* just in case, always disable EHCI SMIs */
			pci_write_config_dword(pdev,
					offset + EHCI_USBLEGCTLSTS,
					0);

In my machine, the write takes place without apparent ill effects. If
I add it as an else clause to the "if LEGSUP_BIOS" test, it won't
execute, because the EHCI_USBLEGSUP_BIOS flag is on.

In case you need it: hcc_params is 0xa012. 

Carlo

-- 
  *         Se la Strada e la sua Virtu' non fossero state messe da parte,
* K * Carlo E. Prelz - fluido@fluido.as             che bisogno ci sarebbe
  *               di parlare tanto di amore e di rettitudine? (Chuang-Tzu)
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