OCD - wiggler baud rate problem

OCD - wiggler baud rate problem

[Jonathan Riches]

Thanks Juro for the info.  It appears that in GDB 5.0 (ocd.c) that all ocd
writes / reads are as bytes, this would account for the problem I also had
in writing an init file, where the SYPCR was only getting 1 byte written,
then it was set for good.

I have found the download speed using wiggler has risen from 10,000 bits/sec
to 25,000,
Regards
Jonathan Riches

Juro wrote >
#######################################################################
Hi Jonathan

There's a bug in OCD.C, I reported it to macraigor:

the file load was SIGNIFICANTLY
slower. Using Raven I achieved the equivalent of about 9600 baud rate.
So I started comparing the old code with the new one and found a serious
bug:

in the file OCD.C you try to determine if to read/write words, halfwords or
bytes.

Your code:
=======================================================
if      ( ((memaddr & 4) == 4) || ((len & 4) == 4) )
   buf[5] = 4;  /* Word align and word length */
else if ( ((memaddr & 2) == 2) || ((len & 2) == 2) )
   buf[5] = 2; /* TWO BYTE WRITE */
else
   buf[5] = 1;  /* default to byte write */
=====================================================

is clearly wrong. You probably meant something like:

=====================================================
  if ( ((memaddr & 3) == 0) && ((len & 3) == 0) )
    buf[5] = 4;  /* Word align and word length */
  else if ( ((memaddr & 1) == 0) && ((len & 1) == 0) )
    buf[5] = 2; /* TWO BYTE WRITE */
  else
    buf[5] = 1;  /* default to byte write */

=====================================================

The same code occurs in two different places.
Indeed, after replacing the code we were back up to the speed
#####################################################################

OCD - wiggler baud rate problem

[Jonathan Riches]

Hello,
can anybody help me out on this:
I am using gdb to connect to an MPC860 prototype board.  I have built GDB
5.0 for a powerpc-rtems target.  The environment is Win NT4.0 / cygwin
1.1.6, target OCD/Wiggler
I'm having a problem in the download speed, for example a 120k file takes
100 seconds to download using an OCD wiggler.  The same file can be
downloaded to the target using Metaware SeeCode debugger (with OCD/wiggler)
within 15 seconds.  The SeeCode uses wigglers.dll.

Does anyone know how to reduce the download time?  Are there any alterations
to ocd.c/h or ser-ocd.c that could be made?
Regards
Jonathan Riches
Senior Design Engineer
Westbridge Design Ltd
Privett, Alton, GU34 3PL,  UK
tel. 01730 828111  fax 01730 828123