Re: [ECOS] Problems building stand-alone gdb stub for ARM AEB

[Ormund Williams <ormundw at brainlink dot com>]

Ormund Williams wrote:
> 
> Gary Thomas wrote:
> >
> > On 04-Oct-2000 Ormund Williams wrote:
> > > Framing errors are my problem.  Seems like a hardware problem, so I'll
> > > work on that next.  Has any body seen this problem?
> > >
> >
> > Notice that when you connect, the host will be sending you a string of
> > 6 characters or so at full speed.  If the target device does not have
> > buffering or isn't quick enough, then this will surely cause framing
> > errors when running at speed.
> 
> The UART on the ARM AEB has no FIFO so each character must be read
> before the next arrives, if that fails the Over-run flag is set in the
> Line Status Register.  This I have tested by inserting a delay.
> 
> The problem I'm seeing though, is the Frame error flag is set.  This
> only happens with some character sequences, from that I am concluding
> that the board is malfunctioning, I am going to try a different one,
> I'll let you know how it goes.
> 
> PS: There's no need to cc me since I'm subscribed to the list. Thanks
> 
> --
> Ormund

Hi

Found the problem!  My ARM AEB's serial port 1 is bad.  Using a MAX202,
some wire and 0.1u caps, I connected my PC to serial port 0 on the ARM
AEB and !!BANG!! gdb connected, no errors!  

Thanks

--
Ormund