Hi,
I think I ran into similar issues, but I don't remember it being a
consistent failure for a given size, just that large transfers were
somewhat unreliable.
I used code like this:
def _load_dram_katcp(self,data,tries=2):
while tries > 0:
try:
self._pause_dram()
self.r.write_dram(data.tostring())
self._unpause_dram()
return
except Exception, e:
print "failure writing to dram, trying again"
# print e
tries = tries - 1
raise Exception("Writing to dram failed!")
to help deal with such problems. But then I found I got more speed by
generating the data as a file on the file system (since I was running the
code on the same machine that hosts the ROACH NFS file system, so I could
write the data to e.g. /srv/roach_boot/etch/boffiles/dram.bin) and then use
the linux command dd on the roach to write the data to DRAM. The code looks
like:
def
_load_dram_ssh(self,data,offset_bytes=0,roach_root='/srv/roach_boot/etch',datafile='boffiles/dram.bin'):
offset_blocks = offset_bytes/512 #dd uses blocks of 512 bytes by
default
self._update_bof_pid()
self._pause_dram()
data.tofile(os.path.join(roach_root,datafile))
dram_file = '/proc/%d/hw/ioreg/dram_memory' % self.bof_pid
datafile = '/' + datafile
result = borph_utils.check_output(('ssh root@%s "dd seek=%d if=%s
of=%s"' % (self.roachip,offset_blocks,datafile,dram_file)),shell=True)
print result
self._unpause_dram()
This seems to work pretty well.
Glenn
On Tue, Apr 8, 2014 at 4:51 PM, Madden, Timothy J. <[email protected]>wrote:
>
>
> I am using a DRAM block on a ROACH 1.
>
> I am using python to write data to the dram with corr.
>
> I create a binary array of zeros like:
>
> fa.lut_binaryIQ = '\x00\x00\x00\x00\x00\x00.....'
>
> Length of the array is 1048576.
>
> If I do
> roach.write('dram_memory',fa.lut_binaryIQ)
>
> It works fine.
>
> If I double the length of the binary array, where
> len(fa.lut_binaryIQ)=2097152
>
> Then I do
> roach.write('dram_memory',fa.lut_binaryIQ)
>
> I get a timeout error
> RuntimeError: Request write timed out after 20 seconds.
>
>
> I have tried longer and longer timeouts of 60sec and still no good result.
> I set the timeout with:
> roach = corr.katcp_wrapper.FpgaClient('192.168.0.67', 7147,timeout=60)
>
>
> Any ideas? It seems there is a 1MB length limit on my dram.
>
> Tim
>
>
>
>
