mpc8xx memory mapped 16550A uart garbage

[Steven Scholz]

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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