I don't know enough to help with loading uboot. Perhaps the following bits of low level information on the Roach2 Rev2 might be of use.
In the Roach2 rev2 schematics U77 (page 26 of 27) drives the JTAG TCK
signals. There are 11 loads: V6, CPLD, PPC, PPCNET, V6NET, QDR0, QDR1, QDR2, QDR3, VMON, CMON The 4 QDR are the same devices so the JTAG IDCODE is probably the same. The voltage and current monitor ICs are both MAX16071 and will have matching IDCODEs. The 2 network devices are both Marvel 88E1111 GbE transceivers so will have matching IDCODES. The series resistors to the right of U77 and U79 show the sequence of the JTAG input/output bits. PPC, V6, CPLD, QDR0, QDR1, QDR2, QDR3, PPCNET, V6NET, CMON, VMON So my guess is
Device ID Code IR Length Part Name Guess from TDI/O 1 0440f1e1 0 PPC440EPX-NUA667T PPC 2 84288093 10 XC6VSX475T V6 3 16d4a093 8 XC2C256 CPLD 4 1a464069 0 CY7C2565KV18 QDR0 5 1a464069 0 CY7C2565KV18 QDR1 6 1a464069 0 CY7C2565KV18 QDR2 7 1a464069 0 CY7C2565KV18 QDR3 8 000003d3 0 88E1111 PPCNET 9 000003d3 0 88E1111 V6NET 10 18006197 0 MAX16071 CMON 11 18006197 0 MAX16071 VMON
I've only heard of the usbWiggler being used with the Roach1. Matt On Sat, 12 Sep 2020, Sebastian Antonio Jorquera Tapia wrote:
Date: Sat, 12 Sep 2020 14:08:54 -0700 (PDT) From: Sebastian Antonio Jorquera Tapia <[email protected]> Reply-To: [email protected] To: "[email protected]" <[email protected]> Subject: [casper] ROACH2 jtag booting Hi Casperiters, 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 :( Luckily I have access to one xilinx jtag so I was thinking in connecting via xmd to the ppc and send the uboot with the command dow. The jtag found 10 devices where one is the Virtex, other one is the Coolrunner and 8 unknown devices. I think the ppc Is none of those unknown devices, because the IR length is zero. So now I have some doubts to how to proceed: 1) Looking at the roach2 diagram, the coolrunner is connected in certain fashion with the ppc. Could I load the uboot using as target the coolrunner? 2) Reading the roach1 bringup memo in the old wiki, it says that one way to upload the uboot is to use a Macraigor usbWiggler to set the ppc program counter in a specific location in order to open a xmodem. The roach2 works in the same way? Also, do I need that specific jtag or the Xilinx one could do the job? https://casper.ssl.berkeley.edu/wiki/ROACH_Bringup#PowerPC_U-Boot_Configuration Here are the possible targets that jtag found: JTAG chain configuration -------------------------------------------------- Device ID Code IR Length Part Name 1 0440f1e1 0 unknown 2 84288093 10 XC6VSX475T 3 16d4a093 8 XC2C256 4 1a464069 0 unknown 5 1a464069 0 unknown 6 1a464069 0 unknown 7 1a464069 0 unknown 8 000003d3 0 unknown 9 000003d3 0 unknown 10 18006197 0 unknown 11 18006197 0 unknown -- 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 visithttps://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/134f9f9b-7141-44a6-9316-49e83dd8050fn%40 lists.berkeley.edu.
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