Hi all,
seems that mcf5307, working at 90Mhz, is not fast enough when "-Os -g"
compile options are set.
I changed for test config.mk from
DBGFLAGS= -g # -DDEBUG
OPTFLAGS= -Os #-fomit-frame-pointer
into
DBGFLAGS= #-g # -DDEBUG
OPTFLAGS= -O2 #-Os #-fomit-frame-pointer
common compiles now with -O2 and ymodem works fine again at 115200.
Also, i don't understand why "-g" is set by default.
Is there a way to override/customize this options for this cpu ?
Or i have to definitely step down to 57600 ?
Best Regards,
Angelo Dureghello
On Sat, Nov 10, 2012 at 02:40:07PM +0100, Angelo Dureghello wrote:
> 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
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