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  • I tried the above tutorial on both RED-V boards, RedBoard and ThingPlus. However, on both boards I get the following error while executing the program when I execute "hello world" through "run configurations":


    SEGGER J-Link GDB Server V6.52e Command Line Version
    
    JLinkARM.dll V6.52e (DLL compiled Oct 16 2019 12:16:54)
    
    Command line: -if jtag -device FE310 -endian little -speed 1000 -port 2331 -swoport 2332 -telnetport 2333 -vd -ir -localhostonly 1 -singlerun -strict -timeout 0 -nogui
    -----GDB Server start settings-----
    GDBInit file:                  none
    GDB Server Listening port:     2331
    SWO raw output listening port: 2332
    Terminal I/O port:             2333
    Accept remote connection:      localhost only
    Generate logfile:              off
    Verify download:               on
    Init regs on start:            on
    Silent mode:                   off
    Single run mode:               on
    Target connection timeout:     0 ms
    ------J-Link related settings------
    J-Link Host interface:         USB
    J-Link script:                 none
    J-Link settings file:          none
    ------Target related settings------
    Target device:                 FE310
    Target interface:              JTAG
    Target interface speed:        1000kHz
    Target endian:                 little
    
    Connecting to J-Link...
    J-Link is connected.
    Firmware: J-Link OB-K22-SiFive compiled Aug 22 2019 14:12:56
    Hardware: V1.00
    S/N: 979005689
    Checking target voltage...
    Target voltage: 3.30 V
    Listening on TCP/IP port 2331
    Connecting to target...
    J-Link found 1 JTAG device, Total IRLen = 5
    JTAG ID: 0x20000913 (RISC-V)
    Connected to target
    Waiting for GDB connection...Connected to 127.0.0.1
    Reading all registers
    Received monitor command: speed 1000
    Target interface speed set to 1000 kHz
    Received monitor command: clrbp
    Received monitor command: reset
    Resetting target
    Received monitor command: halt
    Halting target CPU...
    ...Target halted (PC = 0x00001004)
    Received monitor command: regs
    X0 = 00000000, X1 = 20015444, X2 = 80000F10, X3 = 80001288
    X4 = 00000000, X5 = 200109D2, X6 = 0000000F, X7 = 80000B6C
    X8 = 00000400, X9 = 02000080, X10= 00000000, X11= 8000104C
    X12= 0000000E, X13= 0000000E, X14= 00000000, X15= 00000000
    X16= 0000001F, X17= 00000000, X18= 02000080, X19= 00000000
    X20= 00000000, X21= 00000000, X22= 00000000, X23= 00000000
    X24= 00000000, X25= 00000000, X26= 00000000, X27= 00000000
    X28= 00000000, X29= 00000000, X30= 00000000, X31= 00000000
    PC = 00001004
    Reading all registers
    Received monitor command: speed auto
    Select auto target interface speed (4000 kHz)
    Received monitor command: flash breakpoints 1
    Flash breakpoints enabled
    Received monitor command: semihosting enable
    Semi-hosting enabled (SVC Addr = 0x08)
    Received monitor command: semihosting IOClient 1
    Semihosting I/O set to TELNET Client
    Read 2 bytes @ address 0x00000000 (Data = 0x0000)
    Read 2 bytes @ address 0x00000002 (Data = 0x0000)
    Read 2 bytes @ address 0x00000004 (Data = 0x0000)
    Read 2 bytes @ address 0x00000006 (Data = 0x0000)
    Read 2 bytes @ address 0x00000008 (Data = 0x0000)
    Read 2 bytes @ address 0x0000000A (Data = 0x0000)
    Read 2 bytes @ address 0x0000000C (Data = 0x0000)
    Read 2 bytes @ address 0x0000000E (Data = 0x0000)
    Read 2 bytes @ address 0x00000010 (Data = 0x0000)
    Read 2 bytes @ address 0x00000012 (Data = 0x0000)
    Read 2 bytes @ address 0x00000014 (Data = 0x0000)
    Read 2 bytes @ address 0x00000016 (Data = 0x0000)
    Read 2 bytes @ address 0x00000018 (Data = 0x0000)
    Read 2 bytes @ address 0x0000001A (Data = 0x0000)
    Read 2 bytes @ address 0x0000001C (Data = 0x0000)
    Read 2 bytes @ address 0x0000001E (Data = 0x0000)
    Read 2 bytes @ address 0x00000020 (Data = 0x0000)
    Read 2 bytes @ address 0x00000022 (Data = 0x0000)
    Read 2 bytes @ address 0x00000024 (Data = 0x0000)
    Read 2 bytes @ address 0x00000026 (Data = 0x0000)
    Read 2 bytes @ address 0x00000028 (Data = 0x0000)
    Read 2 bytes @ address 0x0000002A (Data = 0x0000)
    Read 2 bytes @ address 0x0000002C (Data = 0x0000)
    Read 2 bytes @ address 0x0000002E (Data = 0x0000)
    Read 2 bytes @ address 0x00000030 (Data = 0x0000)
    Read 2 bytes @ address 0x00000032 (Data = 0x0000)
    Read 2 bytes @ address 0x00000034 (Data = 0x0000)
    Read 2 bytes @ address 0x00000036 (Data = 0x0000)
    Read 2 bytes @ address 0x00000038 (Data = 0x0000)
    Read 2 bytes @ address 0x0000003A (Data = 0x0000)
    Read 2 bytes @ address 0x0000003C (Data = 0x0000)
    Read 2 bytes @ address 0x0000003E (Data = 0x0000)
    Read 2 bytes @ address 0x00000040 (Data = 0x0000)
    Read 2 bytes @ address 0x00000042 (Data = 0x0000)
    Read 2 bytes @ address 0x00000044 (Data = 0x0000)
    Read 2 bytes @ address 0x00000046 (Data = 0x0000)
    Read 2 bytes @ address 0x00000048 (Data = 0x0000)
    Read 2 bytes @ address 0x0000004A (Data = 0x0000)
    Read 2 bytes @ address 0x0000004C (Data = 0x0000)
    Read 2 bytes @ address 0x0000004E (Data = 0x0000)
    Read 2 bytes @ address 0x00000050 (Data = 0x0000)
    Read 2 bytes @ address 0x00000052 (Data = 0x0000)
    Read 2 bytes @ address 0x00000054 (Data = 0x0000)
    Read 2 bytes @ address 0x00000056 (Data = 0x0000)
    Read 2 bytes @ address 0x00000058 (Data = 0x0000)
    Read 2 bytes @ address 0x0000005A (Data = 0x0000)
    Read 2 bytes @ address 0x0000005C (Data = 0x0000)
    Read 2 bytes @ address 0x0000005E (Data = 0x0000)
    Read 2 bytes @ address 0x00000060 (Data = 0x0000)
    Read 2 bytes @ address 0x00000062 (Data = 0x0000)
    Downloading 404 bytes @ address 0x20010000 - Verified OK
    Downloading 15600 bytes @ address 0x20010200 - Verified OK
    Downloading 5460 bytes @ address 0x20013EF0 - Verified OK
    Downloading 3148 bytes @ address 0x20015444 - Verified OK
    Downloading 12 bytes @ address 0x20016090 - Verified OK
    Downloading 2768 bytes @ address 0x200160A0 - Verified OK
    Comparing flash   [....................] Done.
    Writing register (pc = 0x20010000)
    Reading all registers
    Starting target CPU...
    ERROR: Communication timed out: Requested 4 bytes, received 0 bytes !
    ERROR: Can not read register 4224 (PC) while CPU is running
    WARNING: Target connection lost.
    Reading all registers
    WARNING: Failed to read memory @ address 0x00000000
    

    After the error, the board self ejects and reconnects. I can not copy-and-paste the hex file as well, as board ejects and reconnects when I try.

    Any solution? Thank you.

    • Thanks to @robin_hodgson's detailed instructions ( viewtopic.php?p=211369#p211369 ) I solved the issue. I followed them but with hello world first. When I connected the device and programmed it through Segger IDE, it first updated the driver for J-Link for each board, Redboard and ThingPlus. Both boards worked and the serial terminal displayed the output.

      I repeated the same procedure with Blinky and it worked as well on both boards.

      Finally, I repeated both examples for each board with Freedom IDE and this time they worked.

      I do not know what was the exact problem, but I guess the driver update fixed them.

      Thank you again!

      • I have not heard of that issue before. It looks like you were trying to use the Segger Embedded Studio which was outside of what was tested with the RED-V environments used in this tutorial. I'm glad to hear that you were able to resolve the issue from the forum post.

        For those that have the same issue, the SparkFun forum post is here => [ https://forum.sparkfun.com/viewtopic.php?p=211369#p211369 ].


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