[SeaBIOS] usb ohci pipe free fix

[Nils]

Op woensdag 22-02-2012 om 20:48 uur [tijdzone -0500], schreef Kevin
O'Connor:

> [...]
> > OHCI init on dev 00:0f.4 (regs=0xfe00e000)
> > pmm_malloc zone=0x1f7bfec4 handle=ffffffff size=256 align=100 ret=0x1f7cff00 (detail=0x1f7b7000)
> > pmm_malloc zone=0x1f7bfec4 handle=ffffffff size=16 align=10 ret=0x1f7cfef0 (detail=0x1f7b6fd0)
> > ohci init: c=97 h=0x1f7cff00 h=1f7cff00 f=0
> [...]
> > ohci wait: c=87 h=0x1f7cff00 f=236
> > WARNING - Timeout at ohci_waittick:134!
> 
> That's odd.  It looks like the controller was running for 236ms and
> then freezes.  The only thing I can think of to track this down is to
> sprinkle dprintf() statements through the code until we find what
> caused the controller to stop.
> 
> As an example of more debugging, see the patch below.  I think you'll
> likely need to keep adding statements until finding the place where
> the counter stops.
> 
> Another thing to check is to see if the Linux code has any quirks for
> this particular controller.
> 

I ran your debugging example with timestamps enabled. (attached for
reference)
I'l try to study/test this some more in the next day's.

Thanks for your help!

Nils.

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