So one way of recovering a roach with erased flash is to jtag a very small program into the cpu cache/SRAM. That doesn't require the DRAM to be initialised. From there one can then program the flash.
Such a program exists in https://github.com/ska-sa/roach2_testing/roach2_production_test/support_files/program.mac here formatted in a way that the macgraigor tools can understand. It can speak xmodem, and writes whatever it receives (typically uboot) to flash. But these things can be fiddly, so best not to erase uboot if at all possible. regards marc On Sun, Sep 13, 2020 at 7:40 PM Sebastian Antonio Jorquera Tapia <sebastian.jorqu...@ug.uchile.cl> wrote: > > Thanks for the responses! > I think the Matt guessing is a good starting point, also in page 26 of the > schematics says that to debug the ppc you need the halt signal, my jtag > programmer has it but I am going to take a closer look there. > > I had seen the binging up doc, but I had the feeling that it suppose that you > have the uboot running, they even configure the eth so they have access to > the os. > Like I erased the uboot, the USB doesn't have a loopback so I don't see any > response there :( Anyway the ftdi should still work and I should be able to > run the scripts (crossed fingers) > > I also found some info about the xmd connection of the ppc in the edk > reference manual, and it says that for certain configurations the jtag doesnt > recognize the ppc as a xilinx device, so the user has to explicitly define it > to be recognized. So maybe I am in that case. > > > > El sáb., 12 sept. 2020 a las 19:43, Cesar Strauss (<cesar.stra...@inpe.br>) > escribió: >> >> Em 12/09/2020 18:08, Sebastian Antonio Jorquera Tapia escreveu: >> > When I was playing trying to make a netbooting with the ROACH2 and I >> > issue the command: "run tftpuboot" and making the story short I ended up >> > with no uboot :( >> >> I was able to successfully update the U-Boot on a ROACH2 by following >> these instructions: >> >> https://casper.ssl.berkeley.edu/wiki/ROACH-2_Revision_2#Testing.2FBringup_Status >> >> ... which point to this document: >> >> https://docs.google.com/a/ska.ac.za/document/d/1tqw4C6uZ6EULl1OykTFL_vQTnK52UBr0aYqTg44E5wg/edit >> >> ... which point to this repository: >> >> https://github.com/ska-sa/roach2_testing >> >> .. which has the following bring-up script: >> >> https://github.com/ska-sa/roach2_testing/blob/master/roach2_production_test/roach2_ats.py >> >> ... which has some low level commands: >> >> https://github.com/ska-sa/roach2_testing/blob/master/roach2_production_test/roach2_ats.py#L1034 >> >> Interestingly, you only need a USB cable, since the FTDI chip is >> connected to the JTAG chain internally. >> >> Having said that, the road was not smooth. And, in the end, updating >> UBoot did not solve the root problem we had (DRAM check in U-Boot). We >> ended up shipping the ROACH2 back to Digicom, where they restored it to >> factory condition. >> >> Regards, >> >> Cesar >> >> -- >> You received this message because you are subscribed to the Google Groups >> "casper@lists.berkeley.edu" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to casper+unsubscr...@lists.berkeley.edu. >> To view this discussion on the web visit >> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/5bc6f2ae-7dc5-868f-591a-da7415dfafcf%40inpe.br. > > -- > You received this message because you are subscribed to the Google Groups > "casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAASoV%3DNXWk7v6OjSzrDFvxyx-9T6OEXvYymv5a2Nu_aAH2RsBA%40mail.gmail.com. -- https://katfs.kat.ac.za/~marc/ -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAGrhWaR64THAnV8p3DXW4LzJf%2BsxLdzavAxb_EU4x9OUiKsOdQ%40mail.gmail.com.
