Re: /dev/tty01 will not open on Beaglebone Black

[Brook Milligan <brook%nmsu.edu@localhost>]

> On Sep 1, 2023, at 5:33 PM, Brett Lymn <blymn%internode.on.net@localhost> wrote:
> 
> On Thu, Aug 31, 2023 at 09:02:53PM -0600, Brook Milligan wrote:
>> 
>> However, a write fails and hangs the board hard: no keyboard response, no response to pings.  I have attached the test program below, and would appreciate more eyes on it from (the many) people who obviously know serial line programming better than I do.  It gets as far as the write() call, but no further.
>> 
> 
> This sounds like a driver bug.  In no circumstances should a user land program be able to
> hang a machine.  I would log a kernel PR with your sample code attached.
> 
> I may be helpful if you can get into ddb and get a backtrace there.

I’ll try that.  However, I have little experience with kernel ddb.  Where should I be looking for how to do this and what information should be be logging?  If I were in ddb and the machine hung, would I be able to get a backtrace?

Cheers,
Brook