Hi everyone,
I've been getting my feet wet the last little while introducing myself
to using the ROACH 2 toolset. After being unable to get Tutorial 2 to work
out of the box, I took a step back and am trying to just transmit packets
using the SFP+ port to my PC and read them out. My design is heavily based
on the one in the Roach 2 tutorial except that I am using the katadc to
generate data. What I've tried so far is detailed below:
Right now, I am trying to send 64, 64-bit samples at ~390 kHz (feeding in
an 800 MHz clock) so I shouldn't be overfilling buffers. In simulation, it
looks like *tx_valid* and *tx_end_of_frame* are both being set as I would
expect, namely *tx_valid *goes high whenever I am sending data and
*tx_end_of_frame* goes high for one clock cycle at the end of when I expect
to send data.
On the PC side of things, I also wasn't able to get the Python script to
work out of the box, so I modified it a little bit using suggestions from
the mail archives. The important details are below:
*ip_base = 192*(2**24) + 168*(2**16) + 41*(2**8) *
*mac_base = (2<<40) + (2<<32)*
*fabric_port = 60000*
*gbe_tx = casperfpga.tengbe.TenGbe(fpga, 'gbe0', ip_base+20, 512)*
*gbe_tx.setup(mac_base+20, ip_base+20, fabric_port)*
*gbe_tx.tap_start()*
I am trying to write data to 192.168.41.1 (same subnet as the ROACH2), on
my PC, connected to the ROACH2 using an SFP+ cable. To do this, I've used
the socket library in Python configured to listen for UDP packets at the
required IP/port. However, I am unable to get any data from the ROACH2
whatsoever. I've looked to see if I have any packets coming over the port
using Wireshark and I see nothing.
Something that I've noticed, is that I am unable to ping the gbe port
(after writing the design to the board). When I look at ifconfig after
ssh-ing into the ROACH, I see the following:
*gbe 0 Link encap: UNSPEC HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00*
* inet addr:192.168.41.20 P-t-P:192.168.41.20 Mask:255.255.255.0*
* UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1*
* RX packets:0 errors:0 dropped:0 overruns:0 frame:0*
* TX packets:0 errors:0 dropped:0 overruns:0 carrier:0*
* collisions:0 txqueuelen: 500*
* RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)*
I think this looks reasonable other than the lack of packets being sent.
I'm now off playing with routing tables thinking that this may be my issue,
but I am honestly pretty in the weeds at this point. Do you guys have some
suggestions? I'm sure there are a few things I've fouled up along the way.
Thanks for the help,
Ben G.
--
You received this message because you are subscribed to the Google Groups
"[email protected]" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/4634df92-fb67-4bf5-bcab-22478a4c952cn%40lists.berkeley.edu.
