[U-Boot] common/xyzmodem.c, ymodem, slow behavior receiving bytes

[Wolfgang Denk]

Dear Angelo,

In message <20121123225721.GA28751 at angel3> you wrote:
> 
> i have found out that this issue was also and probably mainly caused 
> from the issue fixed in my last patch posted:
> 
> http://patchwork.ozlabs.org/patch/201421/
> 
> All serial driver routines (for mcfuart.c in my case) was executed
> from the flash memory, even after monitor relocation to ram.
> 
> Considering flash memory access time (10 wait states set in my case), 
> this was causing code execution speed to be dramatically slow, near the 
> limit for receiving at 115200 uart speed.
> 
> Enabling cache for the sdram fasted up a bit the operations and solved 
> the issue, but main problem here was certainly the execution from flash.

Thanks for following up on this!

Best regards,

Wolfgang Denk

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