mpc8xx memory mapped 16550A uart garbage

[Lokesh Kumar]

Hi Steven,
I did measure the bit width and that is around 104us, which is correct.
Anything else?

Thanks,
Lokesh

-----Original Message-----
From: Steven Scholz [mailto:steven.scholz at imc-berlin.de]
Sent: Wednesday, October 15, 2003 10:22 AM
To: Lokesh Kumar
Cc: 'linuxppc-embedded at lists.linuxppc.org'
Subject: Re: mpc8xx memory mapped 16550A uart garbage


Lokesh Kumar wrote:

> Hi,
> I got the serial.c from DENX linuxppc_2.4._devel tree which has support
for
> 16550A as memory mapped uart, and am using it as a module. I made
> modifications to match my board. When I start it, it correctly recognizes
> that I have a 16550A and at correct IRQ. However, when I open and send
> something through the port (I just do cat>/dev/ttySe0), I get garbage on
the
> other side. My 16550 has a crystal of 3.6864MHz and the processor runs at
> 49MHz. I thought that this kind of garbage problem is generally due to
baud
> rate not set correctly. I see the divisor correctly calculated as
> 3686400/16/9600 = 24 and being sent to 16550. What else could I be doing
> wrong?

Did you verify the baudrate using a scope to measure the bittime?

Steven


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