CPM2 UARTs: Won't work under low (<= 1200BD) baudrates?

CPM2 UARTs: Won't work under low (<= 1200BD) baudrates?

[David Tao]

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Hello, guys,


I found that MPC8270 CPM UARTs, both SMCs and SCCs won't work under low baudrate. 

Under 2400 baud or above the UARTs work fine, but once the baudrate set to 1200 or below, there is NO data can be sent out or received even programed to do so.

I am using Linux kernel 2.6.15 (from Denx ELDK4.0). 
 
Can anybody help on this? Thanks in advance.

David


 		
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Re: CPM2 UARTs: Won't work under low (<= 1200BD) baudrates?

[Dan Malek]

On Aug 15, 2006, at 3:52 PM, David Tao wrote:

> Under 2400 baud or above the UARTs work fine, but once the baudrate  
> set to 1200 or below, there is NO data can be sent out or received  
> even programed to do so.

It doesn't look like we check the baud rate and
add the preceding divide-by-16 clock for the
low baud rates like we did on the original CPM.
You can add this, test it, and submit a patch if
you like :-)

Thanks.

	-- Dan