TSE transmit and receive buffers

Finally I solved it.

Seems that it was a problem with a data cache - new formed packed still resided in a cache, and sgdma_tx moved old data to the MAC.

I used my own hardware (not a KIT) with other periphery, and it highlighted the problem of low level ethernet driver.

If anybody else will stuck with such problem, here is a solution:

File: ins_tse_mac.c

function: tse_mac_raw_send

Just after the OS_ENTER_CRITICAL(); added the following:

alt_dcache_flush_all();

Now everything is working well!