Re: old_scheme_first = 0 in drivers/usb/core/hub.c

On Tue, 9 Oct 2007, hong zhang wrote:

> List,
> 
> I am working on a freescale IMX31(ARM) based board
> that has two USB hosts. Host2 connecs to usb scsi hard
> disk(30GB). It is detected in kernel 2.6.10. But it
> could not be detected when kernel upgrades to
> 2.6.19.2. We has gone back to old_scheme_first=1
> (default is 0) at drivers/usb/core/hub.c. hub.c
> explains if new usb scheme does not detect device it
> will try old scheme. Obviously, I have to hard code
> old_scheme_first=1 and usb scsi hard disk will be
> detected.
> 
> Any comment will be appreciated.

Please turn on CONFIG_USB_DEBUG and post the dmesg log under 2.6.22 or 
2.6.23, with old_scheme_first set to 0.

Devices should never need old_scheme_first.  If they did need it then 
they wouldn't work with a Windows host.

Alan Stern


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