Suresh Chandra Mannava wrote:

<snip>

We faced a problem in MPSC serial console part.  The problem is,  in 
Serial console data is received once after 32 characters are typed.

Any thing less than  32 characters  is not  echoed or not transmitted 
till the 32 character count is reached.

After carefully reviewing the code. We found that the receive buffer 
size is initialised to 32 bytes.
We made a small correction in the code by making the receive buffer 
size to 1
rxre->bufsize = 1;

<snip>

Suresh,

I think you fixed a symptom but not the problem.  By default, the rx 
buffers are indeed 32 bytes long (i.e., a cacheline in size).  When 
receiving, the mpsc will generate an interrupt when there is an error, 
when the buffer is full (32 bytes--unlikely if you're typing), or after 
a timeout.  I suspect your timeout value is bogus so you don't get the 
interrupt until you fill the buffer with 32 bytes.  Please compare the 
platform_data that you pass to the mpsc driver to other, working systems 
that use the mpsc (e.g., katana and cpci690).  In particular, look at 
your 'max_idle' value.

Mark