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Date:	Thu, 5 May 2005 19:20:17 +0200
To:	"'linux-mips@linux-mips.org'" <linux-mips@linux-mips.org>
Subject: Re: USB hangs on AU1100
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From:	Thiemo Seufer <ths@networkno.de>
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Pete Popov wrote:
> On Thu, 2005-05-05 at 17:54 +0200, Rodolfo Giometti wrote:
> > Hello,
> > 
> > I'm just using USB host support on a AU1100 developing board (DB1100
> > configuration) and i notice that CPU locks in function
> > au1xxx_start_hc():
> > 
> >         /* wait for reset complete (read register twice; see au1500 errata) */
> >         while (au_readl(USB_HOST_CONFIG),
> >                 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
> >                 udelay(1000);
> > 
> > while waiting for USB controller to reset. I checked it out and I
> > discovered that register USB_HOST_CONFIG is fixed at value 0xe! So the
> > controller never reset...
> > 
> > Linux is 2.6.12-rc3 from CVS.
> > 
> > Someone knows whats wrong?
> 
> It sounds like this is a custom Au1100 based board? What boot code are
> you running?  I'm guessing the SOC isn't setup correctly or you have a
> HW problem.

I wonder if the code works reliable. At least, a comma operator isn't a
sequence point, which means the compiler is free to change the execution
order.


Thiemo