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Re: Problems building stand-alone gdb stub for ARM AEB
- To: ecos <ecos-discuss at sourceware dot cygnus dot com>
- Subject: Re: [ECOS] Problems building stand-alone gdb stub for ARM AEB
- From: Ormund Williams <ormundw at brainlink dot com>
- Date: Wed, 04 Oct 2000 13:31:28 -0400
- Organization: Ormlab
- References: <XFMail.20001003223358.gthomas@redhat.com>
- Reply-To: ecos <ecos-discuss at sourceware dot cygnus dot com>
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