Re: coldfire uart question

[Greg Ungerer <gregungerer@westnet.com.au>]

Hi Angelo,

On 16/10/17 03:28, Angelo Dureghello wrote:
> i was trying a file transfer with xmodem-1k
> and uClinux "rx" on the mcf54415 stnmark2 board side.
> 
> This using a recent mainline kernel:
> / # cat /proc/version
> uClinux version 4.14.0-rc4stmark2-001-00118-g811fdbb62a9d
> / #
> 
> So, as per xmodem-1k, i send 3 bytes header,
> a 1024 bytes block, and 2 bytes crc16. But "rx" timeouts
> waiting the block.
> 
> Adding some traces to "rx", it timeouts since some bytes
> (5 to 10) randomly positioned in the block are not received.
> Of course they have been sent (scope checked).

Check if you are getting overruns on the port:

  cat /proc/tty/driver/mcf

Regards
Greg



> The same 1024 bytes transfer in u-boot (y-modem)
> always succeed.
> 
> Since mcf54415 has a 4 slots RX fifo UART, i was wondering
> if the mcf.c uart driver is not fast enough to read the data,
> or, where the "linux" limitation could be.
> 
> Regards,
> Angelo Dureghello
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