Re: [microblaze-uclinux] [patch] valid data left in rx fifo: no more interrupts

[Yasushi SHOJI <yashi@xxxxxxxxxxxxxxxxx>]

At Fri, 04 Jun 2004 20:06:09 +1000,
John Williams wrote:
[...]
> > What that means is that, the Interrupt controller won't get
> > interrupted from UART Lite any more, even if UART lite get new data.
> 
> hmmm... I would have thought exactly the opposite - as soon as the 
> generic IRQ handling code acks and unmasks the UARTLite IRQ, the 
> still-asserted interrupt would be registered once again, and we'd 
> actually end up in a nasty interrupt loop with no user process getting 
> any time to actually drain the flip buffer...

Unless I'm (well, actually it's not me but my hardware guy helped me
reading the source ;) mis-reading, INTC gets UART Lite interrupt with
FDC.

Even if you clear FDC while C is asserted with level, you won't get
signal.

> So, perhaps the fix is correct, but for exactly the opposite reason that 
> you suggest ;-)
> 
> Have you tried copy and pasting a large chunk of text into a terminal 
> window after your fix?  That usually is a good way to hang the serial 
> driver...

yup, i did that, and the patch fix the problem.

Jozsef, would you mind applying the patch to see whether the patch fix
the phenomea you are seeing?

regards,
--
            yashi
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