Re: [microblaze-uclinux] UARTLite at 115200

[Shamile Khan <shamile@edgewater.ca>]

I am running u-boot monitor on Memec Virtex II Pro board and u-boot
accepts a binary file through the serial port. I use hyperterminal to
send a binary file to Memec board and hyperterminal shows me the
throughput in real-time and its around 6000 instead of 19200 (when
u-boot, hyperterminal and uartlite are configured for 19200). When I set
them all to be 115200, I get a throughput of around 17000.

Shamile

On Tue, 2003-08-12 at 17:29, John Williams wrote:
> Hi Shamile,
> 
> Shamile Khan wrote:
> > Just wanted to confirm if you are using and measured the throughput of
> > Uartlite at 115200 KBPS. I only changed the parameter C_BAUDRATE to
> > 115200 and I can only get upto around 17000 KBPS. Is there anything I am
> > missing?
> 
> How have you measured the throughput?  I've seen similar things when, 
> say using XMD to download binary files onto the board.  The effective 
> baudrate is much lower than the "physical" rate.
> 
> I think this is because the uartlite has only 16 character tx/rx buffers 
> - meaning that it's pretty tough for software to keep up without 
> especially the RX buffer over flowing.  The protocol used by xmd to 
> communicate with xmdstub has a resync command - i suspect that several 
> "resync" and other commands get sent for every word of "real" data.
> 
> Now that the uclinux shell is up, I'm trying to get something like a 
> zmodem program working as a means of pulling large files (ie kernel and 
> filesystem images) over the serial port.  I've successfully built the 
> lrzsz package for microblaze uclinux, but haven't got it going yet.
> 
> Cheers,
> 
> John
> 
> ___________________________
> microblaze-uclinux mailing list
> microblaze-uclinux@itee.uq.edu.au
> Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
> 
> 
> 


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@itee.uq.edu.au
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/