Dear all,
i am experiencing a strange behavior on the u-boot ymodem protocol.
I am running u-boot, (pulled from origin/head yesterday) on a mcf5307 based
board. I am currently working to include this board/cpu as supported into
u-boot.
cpu runs at 90Mhz (bus clock@45), baud rate 115200.
On an older u-boot (2011.09.00122), i was able to upload files through ymodem
at 115200 without any issue.
Once pulled yesterday head, and installed on the board, i am no more able to
upload files. U-boot times out when the first 128 bytes block is sent, and
sends SYN (C) again, so i started some debugging on xyzmodem.c:
Protocol times-out here, from line 434
....
xyz.len = (c == SOH) ? 128 : 1024;
xyz.bufp = xyz.pkt;
for (i = 0; i < xyz.len; i++)
{
res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c);
ZM_DEBUG (zm_save (c));
if (res)
{
xyz.pkt[i] = c;
}
else
{
ZM_DEBUG (zm_dump (__LINE__));
---->> return xyzModem_timeout;
}
}
Echoing received char back to PC, i see about 1 every 3 received chars seems
lost somewhere, so the first 128bytes block is never completely received
(time out).
I measured baudrate through oscilloscope,
from PC to u-boot board, i have 115600
from u-boot board to PC, i have 117180 (still inside 2% tolerance)
Also verified timer/delay functions works properly in new u-boot build.
As clients i used minicom and other, and have the same result.
So from a first look, seems the receive routine from line 434 is no more fast
enough to receive the whole block. I moved speed down to 57600, upload works
fine again.
What do you think about ?
Best Regards,
Angelo Dureghello
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
