RE: Problems with Intel e100 driver on new MIPS port, was: Advice needed WRT very slow nfs in new port...

["Maciej W. Rozycki" <macro@linux-mips.org>]

On Thu, 30 Jun 2005, David Daney wrote:

> It seems that it is a memory consistancy problem of some sort.  By 
> placing wbflush() after all writes to NIC registers it works.  This 
> leads me to think that either the driver is buggy WRT processors that 
> have write-back queues or my implementation (the default implementation) 
> of writeb() and friends is buggy on this processor.  Now it could be 
> that all that is needed is wmb() before some of the register writes, but 
> since on my processor they both do the same thing (sync) it is hard to 
> tell.

 Most likely that code has only been ever used on i386 systems (who'd want 
to use such a weird Ethernet chip elsewhere?), so don't expect it to be 
terribly sane.

  Maciej