boards: bl602evb flash and debug notes
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Brennan Ashton
Alan Carvalho de Assis
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a42260a1ef
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# Getting Started with nsh configuration
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1. Download and install toolchain
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$ curl https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz
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2. Download Bouffalo lab flash tools
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2. Download flash tools
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There are multiple tools that can be used, but option (a) is recommended.
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a. blflash -- cross platform open-source (recommended)
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curl -L -o blflash https://github.com/spacemeowx2/blflash/releases/download/v0.3.0/blflash-linux-amd64
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chmod +x ./blflash
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$ git clone https://github.com/bouffalolab/flash_tools.git
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b. Bouffalo Lab flash tools (official)
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https://github.com/bouffalolab/flash_tools.git
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3. Configure and build NuttX
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@ -18,11 +24,174 @@
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4. Connect bl602 and computer via USB
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5. Run flash tools, select the nuttx.bin generated in the previous step in the
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Firmware bin field, and refer to the document for the settings of the remaining fields.
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Click the download button to download bin to bl602.
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5. Flash
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Use option (a) or (b) based on tool selection in section 2.
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a. Using blflash
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Place the board in bootloader mode
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bl602evb: Jumper IO8 to HI and press reset
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DT-BL10: Press and hold D8, press and release EN, release D8
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$ blflash flash nuttx.bin --port /dev/ttyUSB0
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[INFO blflash::flasher] Start connection...
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[TRACE blflash::flasher] 5ms send count 55
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[TRACE blflash::flasher] handshake sent elapsed 159.674µs
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[INFO blflash::flasher] Connection Succeed
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[INFO blflash] Bootrom version: 1
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[TRACE blflash] Boot info: BootInfo { len: 14, bootrom_version: 1, otp_info: [0, 0, 0, 0, 3, 0, 0, 0, a4, 9b, 2, 42, e8, b4, 1d, 0] }
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[INFO blflash::flasher] Sending eflash_loader...
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[INFO blflash::flasher] Finished 2.563450723s 11.15KB/s
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[TRACE blflash::flasher] 5ms send count 500
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[TRACE blflash::flasher] handshake sent elapsed 5.065786ms
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[INFO blflash::flasher] Entered eflash_loader
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[INFO blflash::flasher] Skip segment addr: 0 size: 47504 sha256 matches
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[INFO blflash::flasher] Skip segment addr: e000 size: 272 sha256 matches
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[INFO blflash::flasher] Skip segment addr: f000 size: 272 sha256 matches
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[INFO blflash::flasher] Skip segment addr: 10000 size: 351584 sha256 matches
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[INFO blflash::flasher] Skip segment addr: 1f8000 size: 5671 sha256 matches
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[INFO blflash] Success
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6. Run $ picocom -b 115200 /dev/ttyUSB0 (If you see garbled characters at the begining, it is because
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boot2 outputs some log at 2M baud rate), then you will see "nuttx>" prompt.
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b Using BL flash_tools
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Run flash tools, select the nuttx.bin generated in the previous step in the
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Firmware bin field, and refer to the document for the settings of the remaining fields.
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How to download to bl602 can refer to the docs in the https://github.com/bouffalolab/bl_iot_sdk repository.
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6. Run connect terminal to UART (default baudrate 2000000)
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$ screen /dev/ttyUSB0 2000000
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7. Reset Device
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bl602evb: Press reset
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DT-BL10: Press and release EN
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8. NSH should appear on console
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# Using openocd and gdb:
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This guide is focused on the bl602evb board. See the reference manual for
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how to connect to the JTAG interface for other boards.
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1. Make sure you are running a recently built version of openocd. The packaged
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versions are very old, and will likely not work. https://github.com/ntfreak/openocd
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2. Create a openocd-bl602.cfg file
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##############################################################################
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adapter driver ftdi
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ftdi_vid_pid 0x0403 0x6010
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ftdi_channel 1
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transport select jtag
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adapter speed 2000
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ftdi_layout_init 0x00f8 0x00fb
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set _CHIPNAME riscv
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jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x20000c05
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set _TARGETNAME $_CHIPNAME.cpu
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target create $_TARGETNAME.0 riscv -chain-position $_TARGETNAME
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$_TARGETNAME.0 configure -work-area-phys 0x22020000 -work-area-size 0x10000 -work-area-backup 1
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echo "Ready for Remote Connections"
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$_TARGETNAME.0 configure -event reset-assert-pre {
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echo "reset-assert-pre"
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adapter speed 100
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}
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$_TARGETNAME.0 configure -event reset-deassert-post {
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echo "reset-deassert-post"
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adapter speed 4000
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reg mstatus 0x80000000
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reg pc 0x21000000
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}
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$_TARGETNAME.0 configure -event reset-init {
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echo "reset-init"
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adapter speed 4000
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}
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gdb_memory_map enable
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gdb_flash_program disable
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riscv set_prefer_sba on
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riscv set_command_timeout_sec 1
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init
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reset init
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##############################################################################
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3. Create a openocd.gdb configuration
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##############################################################################
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target extended-remote :3333
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set print asm-demangle on
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set backtrace limit 32
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mem 0x22008000 0x22014000 rw
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mem 0x42008000 0x42014000 rw
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mem 0x22014000 0x22020000 rw
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mem 0x42014000 0x42020000 rw
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mem 0x22020000 0x22030000 rw
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mem 0x42020000 0x42030000 rw
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mem 0x22030000 0x2204C000 rw
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mem 0x42030000 0x4204C000 rw
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mem 0x23000000 0x23400000 ro
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mem 0x40000000 0x40010000 rw
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break __start
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stepi
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##############################################################################
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3. Connect openocd
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$ openocd -f openocd-bl602.cfg
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Open On-Chip Debugger 0.10.0+dev-01514-ga8edbd020-dirty (2020-11-19-20:11)
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Licensed under GNU GPL v2
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For bug reports, read
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http://openocd.org/doc/doxygen/bugs.html
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Ready for Remote Connections
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Info : clock speed 2000 kHz
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Info : JTAG tap: riscv.cpu tap/device found: 0x20000c05 (mfg: 0x602 (<unknown>), part: 0x0000, ver: 0x2)
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Info : datacount=1 progbufsize=2
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Info : Disabling abstract command reads from CSRs.
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Info : Examined RISC-V core; found 1 harts
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Info : hart 0: XLEN=32, misa=0x40801125
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Info : starting gdb server for riscv.cpu.0 on 3333
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Info : Listening on port 3333 for gdb connections
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Info : JTAG tap: riscv.cpu tap/device found: 0x20000c05 (mfg: 0x602 (<unknown>), part: 0x0000, ver: 0x2)
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reset-assert-pre
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reset-deassert-post
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Info : Disabling abstract command writes to CSRs.
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reset-init
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Info : Listening on port 6666 for tcl connections
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Info : Listening on port 4444 for telnet connections
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4. Connect gdb
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This is a short demo placing a breakpoint at the entry to nsh.
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NOTE: openocd+gdb cannot be used at this time to flash the device.
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$ riscv64-unknown-elf-gdb nuttx -x openocd-bl602.gdb
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Reading symbols from nuttx...
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0x21000000 in ?? ()
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Breakpoint 1 at 0x2300000a: file chip/bl602_entry.S, line 41.
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Note: automatically using hardware breakpoints for read-only addresses.
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0x21000004 in ?? ()
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(gdb) b nsh_main
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Breakpoint 2 at 0x23003f32: file nsh_main.c, line 123.
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(gdb) mon reset halt
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JTAG tap: riscv.cpu tap/device found: 0x20000c05 (mfg: 0x602 (<unknown>), part: 0x0000, ver: 0x2)
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reset-assert-pre
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reset-deassert-post
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(gdb) c
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Continuing.
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Breakpoint 1, bl602_start () at chip/bl602_entry.S:41
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41 li t0, MSTATUS_MIE
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(gdb) c
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Continuing.
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Breakpoint 2, nsh_main (argc=1, argc@entry=<error reading variable: value has been optimized out>, argv=0x420134c0, argv@entry=<error reading variable: value has been optimized out>)
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at nsh_main.c:123
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123 sched_getparam(0, ¶m);
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(gdb) bt
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#0 nsh_main (argc=1, argc@entry=<error reading variable: value has been optimized out>, argv=0x420134c0, argv@entry=<error reading variable: value has been optimized out>) at nsh_main.c:123
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#1 0x230030f0 in nxtask_startup (entrypt=<optimized out>, argc=<optimized out>, argv=<optimized out>) at sched/task_startup.c:165
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#2 0x23001362 in nxtask_start () at task/task_start.c:144
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#3 0x00000000 in ?? ()
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Backtrace stopped: frame did not save the PC
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