Re: [Linux-usb-users] ehci_hcd with slower FSB than normal (fwd)

On Monday 05 February 2007 11:27 am, Alan Stern wrote:

> ---------- Forwarded message ----------
> Date: Sun, 04 Feb 2007 14:20:52 -0500
> From: [email protected]
> To: [email protected]
> Subject: [Linux-usb-users] ehci_hcd with slower FSB than normal
> 
> I have a pc that I use as a VDR. In order to use less power and make it 
> a little quiter I run
> it with a lower FSB than I could. Normal is FSB 133 Mhz and I run it 
> with 66 Mhz FSB.
> 
> The problem is that the ehci_hcd doesn't work with my FSB 66 Mhz.
> No USB 2.0 memory stick and no USB 2.0 harddisk.
> If I remove ehci_hcd it runs nicely with uhci_hcd, but slowly of course.
> 
> When I run it with FSB 66 Mhz I get:
> 
> kernel: usb 4-2: new high speed USB device using ehci_hcd and address 2
> kernel: usb 4-2: no configurations
> kernel: usb 4-2: can't read configurations, error -22
> 
> When I run it with FSB 133 Mhz I get:
> 
> kernel: usb 4-2: new high speed USB device using ehci_hcd and address 2
> kernel: usb 4-2: configuration #1 chosen from 1 choice
> 
> When I boot into Windows USB seems to work nicely in FSB 66 so
> it shouldn't be a hardware problem?

The usual next question:  what does the kernel say with CONFIG_USB_DEBUG
enabled?

I've heard of problems with VIA, but that one's especially wierd.

- Dave

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