# in opensbi
$ make CROSS_COMPILE=riscv64-linux-gnu- -j4 PLATFORM=rocket-chip-vcu128
# in this repo
$ python3 bootrom/boot.py ~/opensbi/build/platform/rocket-chip-vcu128/firmware/fw_jump.bin /dev/ttyUSB2
Firmware Base             : 0x80000000
Firmware Size             : 68 KB
Runtime SBI Version       : 0.2

Boot HART ID              : 0
Boot HART Domain          : root
Boot HART ISA             : rv64imafdcsux
Boot HART Features        : scounteren,mcounteren

# in u-boot
$ make rocket-chip-vcu128_defconfig
$ make CROSS_COMPILE=riscv64-linux-gnu- -j4
# in this repo
$ python3 bootrom/boot.py /path/to/u-boot/u-boot.bin /dev/ttyUSB2
U-Boot 2021.07-00003-gfb1465705b (Sep 28 2021 - 15:53:56 +0800)

CPU:   rv64imafdc
Model: freechips,rocketchip-unknown
DRAM:  256 MiB
Loading Environment from nowhere... OK
In:    serial@60200000
Out:   serial@60200000
Err:   serial@60200000
Net:   AXI EMAC: 60400000, phyaddr 3, interface sgmii
eth0: eth0@60400000
=> 

# in u-boot
$ make rocket-chip-vcu128-smode_defconfig
$ make CROSS_COMPILE=riscv64-linux-gnu- -j4
# in opensbi
$ make CROSS_COMPILE=riscv64-linux-gnu- -j4 PLATFORM=rocket-chip-vcu128 FW_PAYLOAD_PATH=$HOME/u-boot/u-boot.bin all
# in this repo
$ python3 boot.py ~/opensbi/build/platform/rocket-chip-vcu128/firmware/fw_payload.bin /dev/ttyUSB2
# same as above

# build and launch tftp server
$ sudo pip3 install -U py3tftp
$ cd software
$ make
$ sudo python3 -m py3tftp -p 69
# in u-boot
=> tftpboot 0x80200000 10.0.0.1:uart.img
Using eth0@60400000 device
TFTP from server 10.0.0.1; our IP address is 10.0.0.2
Filename 'uart.img'.
Load address: 0x80200000
Loading: #
         929.7 KiB/s
done
Bytes transferred = 952 (3b8 hex)
=> go 0x80200000
## Starting application at 0x80200000 ...
test

# in Linux
# build arch/riscv/boot/image.itb
$ ./build.sh
# launch tftp server in arch/riscv/boot
$ cd arch/riscv/boot
$ sudo python3 -m py3tftp -p 69
# in U-Boot
# build opensbi with u-boot.bin payload
$ ./build_smode.sh
# in this repo
$ python3 boot.py ~/opensbi/build/platform/rocket-chip-vcu128/firmware/fw_payload.bin /dev/ttyUSB2
# in U-Boot shell
=> tftpboot 0x82000000 10.0.0.1:image.itb
Using eth0@60400000 device
TFTP from server 10.0.0.1; our IP address is 10.0.0.2
Filename 'image.itb'.
Load address: 0x82000000
=> bootm 0x82000000
## Loading kernel from FIT Image at 82000000 ...
   Using 'conf' configuration
[    0.334581] Run /sbin/init as init process
[    0.339225] Run /etc/init as init process
[    0.343753] Run /bin/init as init process
[    0.348635] Run /bin/sh as init process
[    0.353252] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[    0.361108] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-00002-gbdc6f5f9d850-dirty #39
[    0.365621] Hardware name: freechips,rocket-chip-vcu128 (DT)
[    0.368620] Call Trace:
[    0.369994] [<ffffffff80002d46>] dump_backtrace+0x1c/0x24
[    0.372992] [<ffffffff8011d0c2>] dump_stack_lvl+0x34/0x48
[    0.375968] [<ffffffff8011d0ea>] dump_stack+0x14/0x1c
[    0.378738] [<ffffffff8011b1e6>] panic+0xee/0x264
[    0.381320] [<ffffffff8011d59e>] kernel_init+0xe8/0xf4
[    0.384192] [<ffffffff80001814>] ret_from_exception+0x0/0xc
[    0.387351] ---[ end Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance. ]---

# in buildroot-external
$ cd rocket-chip-vcu128
$ ./build.sh
# in linux
$ ./build.sh
# in this repo
$ python3 boot.py ~/opensbi/build/platform/rocket-chip-vcu128/firmware/fw_payload.bin /dev/ttyUSB2
=> run boot_linux
Using eth0@60400000 device
TFTP from server 10.0.0.1; our IP address is 10.0.0.2
Filename 'image.itb'.
Load address: 0x82000000
[    1.757872] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    1.778840] printk: console [ttyS0] disabled
[    1.782014] 60200000.serial: ttyS0 at MMIO 0x60201000 (irq = 1, base_baud = 6250000) is a 16550A
[    1.787402] printk: console [ttyS0] enabled
[    1.787402] printk: console [ttyS0] enabled
[    1.792138] printk: bootconsole [sbi0] disabled
[    1.792138] printk: bootconsole [sbi0] disabled

[    1.847546] Freeing unused kernel image (initmem) memory: 2116K
[    1.851446] Run /init as init process
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK

Welcome to Buildroot
buildroot login: root
Jan  1 00:00:28 login[82]: root login on 'ttyS0'

$ openocd -f openocd.cfg
Open On-Chip Debugger 0.11.0-rc2
Licensed under GNU GPL v2
For bug reports, read
        http:https://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'.
1
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : clock speed 10000 kHz
Info : JTAG tap: riscv.cpu tap/device found: 0x10000913 (mfg: 0x489 (SiFive Inc), part: 0x0000, ver: 0x1)
Info : datacount=2 progbufsize=16
Info : Disabling abstract command reads from CSRs.
Info : Examined RISC-V core; found 1 harts
Info :  hart 0: XLEN=64, misa=0x800000000094112d
Info : starting gdb server for riscv.cpu.0 on 3333
Info : Listening on port 3333 for gdb connections
$ riscv64-unknown-elf-gdb
GNU gdb (GDB) 12.0.50.20220308-git
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http:https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-linux-gnu --target=riscv64-unknown-elf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http:https://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb) target extended-remote localhost:3333
Remote debugging using localhost:3333
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
0x0000000000010106 in ?? ()
(gdb)