Hello On Tue, Mar 5, 2013 at 7:25 PM, Jason Castro <[email protected]> wrote: > I just loaded the latest version of tcpborphserver dated 2013-02-12T17:00:21 > for my ROACH2. I've recompiled tutorial1 for a ROACH2 and I'm able to load > the bof file to the FPGA, however when I try to read a register I get a > communications error from the Roach and the personality of the FPGA is > dumped. The roach is still on the network and KATCP is still there, but I > have to reload the BOF file. It appears I can write to registers correctly. > If I request say 5 bytes from the sys_stratchpad KATCP recovers gracefully > with an error, but if I request 4 bytes I get the following error dump from > the ROACH2, as read from the USB serial interface:
Just to check and help us debug things: Are you using ?wordread or ?read to access the data ? ?read sys_scratchpad 0 4 ?wordread sys_scratchpad 0 1 (reads operate on byte quantities, wordreads on multiples of 32bits). sys_scratchpad is only 1 word (4 bytes) long, so the 5 byte read will be trapped by sanity checks before even a bus transaction occurs. > Machine check in kernel mode. > Data Read PLB Error > Oops: Machine check, sig: 7 [#6] Sig 7 is a bus error, so a transaction across the EPB timed out or failed. A userspace application has difficulties recovering from this - for most purposes it is handled similarly to a segmentation fault. We are keen to understand what fails... let us know how things progress ... Did the problem only appear after the new tcpborphserver install ? Did it happen on other gateware images ? regards marc
