[ale] UART Debugging headache w/ embedded Linux SBC

[Christopher Fowler]

My concern would be why the line is not getting reset.  Possibly the
kernel has locked up while servicing the interrupt?  When the board
locks up do you know what the kernel is actually doing at that point?

Is this UART on a separate PC/104 module is it part of the SBC?  Is the
SBC the TS-7200?


On Mon, 2006-01-16 at 14:03 -0500, John Mills wrote:
> ALErs (particularly embedded-processor wonks) -
> 
> I have an ARM/linux single-board computer that experiences irregular but
> fairly frequent (~1s. to 3:45hr.) lockups. It appears that an off-board
> 16550A UART has requested an interrupt that was not successfully reset by
> the (generic) kernel driver. It may send 200 packets fine, then lock -
> effectively freezing the board.
> 
> I see chip-selection activity but the ISR line is solidly asserted.
> 
> Any suggestions on how to debug this @#$%!!???
> 
> TIA.
> 
>  - Mills
> 
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