VisionFive2 - 03

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VisionFive2 has been talked twice recently:

Today, we’re going to follow U-Boot VisionFive2 and demonstrate the MOST up-to-date U-Boot, Linux kernel, and OpenSBI.

1. Building

1.1 OpenSBI

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➜  opensbi git:(master) make PLATFORM=generic FW_TEXT_START=0x40000000 FW_OPTIONS=0
 CC        lib/sbi/riscv_asm.o
 CC        lib/sbi/riscv_atomic.o
 AS        lib/sbi/riscv_hardfp.o
 CC        lib/sbi/riscv_locks.o
 CC        lib/sbi/sbi_ecall.o
 CC        lib/sbi/sbi_ecall_exts.o
 CC        lib/sbi/sbi_ecall_time.o
 CC        lib/sbi/sbi_ecall_rfence.o
 CC        lib/sbi/sbi_ecall_ipi.o
 CC        lib/sbi/sbi_ecall_base.o
 CC        lib/sbi/sbi_ecall_hsm.o
 CC        lib/sbi/sbi_ecall_srst.o
 CC        lib/sbi/sbi_ecall_susp.o
 CC        lib/sbi/sbi_ecall_pmu.o
 CC        lib/sbi/sbi_ecall_dbcn.o
 CC        lib/sbi/sbi_ecall_cppc.o
 CC        lib/sbi/sbi_ecall_legacy.o
 CC        lib/sbi/sbi_ecall_vendor.o
 CC        lib/sbi/sbi_bitmap.o
 CC        lib/sbi/sbi_bitops.o
 CC        lib/sbi/sbi_console.o
 CC        lib/sbi/sbi_domain.o
 CC        lib/sbi/sbi_emulate_csr.o
 CC        lib/sbi/sbi_fifo.o
 CC        lib/sbi/sbi_hart.o
 CC        lib/sbi/sbi_heap.o
 CC        lib/sbi/sbi_math.o
 AS        lib/sbi/sbi_hfence.o
 CC        lib/sbi/sbi_hsm.o
 CC        lib/sbi/sbi_illegal_insn.o
 CC        lib/sbi/sbi_init.o
 CC        lib/sbi/sbi_ipi.o
 CC        lib/sbi/sbi_irqchip.o
 CC        lib/sbi/sbi_misaligned_ldst.o
 CC        lib/sbi/sbi_platform.o
 CC        lib/sbi/sbi_pmu.o
 CC        lib/sbi/sbi_scratch.o
 CC        lib/sbi/sbi_string.o
 CC        lib/sbi/sbi_system.o
 CC        lib/sbi/sbi_timer.o
 CC        lib/sbi/sbi_tlb.o
 CC        lib/sbi/sbi_trap.o
 CC        lib/sbi/sbi_unpriv.o
 AS        lib/sbi/sbi_expected_trap.o
 CC        lib/sbi/sbi_cppc.o
 AR        lib/libsbi.a
 CC        platform/generic/lib/utils/timer/aclint_mtimer.o
 CC        platform/generic/lib/utils/timer/andes_plmt.o
 CC        platform/generic/lib/utils/timer/fdt_timer.o
 CC        platform/generic/lib/utils/timer/fdt_timer_drivers.o
 CC        platform/generic/lib/utils/timer/fdt_timer_mtimer.o
 CC        platform/generic/lib/utils/timer/fdt_timer_plmt.o
 CC        platform/generic/lib/utils/sys/htif.o
 CC        platform/generic/lib/utils/sys/atcsmu.o
 CC        platform/generic/lib/utils/serial/fdt_serial.o
 CC        platform/generic/lib/utils/serial/fdt_serial_drivers.o
 CC        platform/generic/lib/utils/serial/fdt_serial_cadence.o
 CC        platform/generic/lib/utils/serial/fdt_serial_gaisler.o
 CC        platform/generic/lib/utils/serial/fdt_serial_htif.o
 CC        platform/generic/lib/utils/serial/fdt_serial_renesas_scif.o
 CC        platform/generic/lib/utils/serial/fdt_serial_shakti.o
 CC        platform/generic/lib/utils/serial/fdt_serial_sifive.o
 CC        platform/generic/lib/utils/serial/fdt_serial_litex.o
 CC        platform/generic/lib/utils/serial/fdt_serial_uart8250.o
 CC        platform/generic/lib/utils/serial/fdt_serial_xlnx_uartlite.o
 CC        platform/generic/lib/utils/serial/cadence-uart.o
 CC        platform/generic/lib/utils/serial/gaisler-uart.o
 CC        platform/generic/lib/utils/serial/renesas_scif.o
 CC        platform/generic/lib/utils/serial/shakti-uart.o
 CC        platform/generic/lib/utils/serial/sifive-uart.o
 CC        platform/generic/lib/utils/serial/litex-uart.o
 CC        platform/generic/lib/utils/serial/uart8250.o
 CC        platform/generic/lib/utils/serial/xlnx-uartlite.o
 CC        platform/generic/lib/utils/serial/semihosting.o
 CC        platform/generic/lib/utils/reset/fdt_reset.o
 CC        platform/generic/lib/utils/reset/fdt_reset_drivers.o
 CC        platform/generic/lib/utils/reset/fdt_reset_atcwdt200.o
 CC        platform/generic/lib/utils/reset/fdt_reset_gpio.o
 CC        platform/generic/lib/utils/reset/fdt_reset_htif.o
 CC        platform/generic/lib/utils/reset/fdt_reset_sunxi_wdt.o
 CC        platform/generic/lib/utils/reset/fdt_reset_syscon.o
 CC        platform/generic/lib/utils/regmap/fdt_regmap.o
 CC        platform/generic/lib/utils/regmap/fdt_regmap_drivers.o
 CC        platform/generic/lib/utils/regmap/fdt_regmap_syscon.o
 CC        platform/generic/lib/utils/regmap/regmap.o
 CC        platform/generic/lib/utils/libfdt/fdt.o
 CC        platform/generic/lib/utils/libfdt/fdt_addresses.o
 CC        platform/generic/lib/utils/libfdt/fdt_check.o
 CC        platform/generic/lib/utils/libfdt/fdt_empty_tree.o
 CC        platform/generic/lib/utils/libfdt/fdt_ro.o
 CC        platform/generic/lib/utils/libfdt/fdt_rw.o
 CC        platform/generic/lib/utils/libfdt/fdt_strerror.o
 CC        platform/generic/lib/utils/libfdt/fdt_sw.o
 CC        platform/generic/lib/utils/libfdt/fdt_wip.o
 CC        platform/generic/lib/utils/irqchip/fdt_irqchip.o
 CC        platform/generic/lib/utils/irqchip/fdt_irqchip_drivers.o
 CC        platform/generic/lib/utils/irqchip/fdt_irqchip_aplic.o
 CC        platform/generic/lib/utils/irqchip/fdt_irqchip_imsic.o
 CC        platform/generic/lib/utils/irqchip/fdt_irqchip_plic.o
 CC        platform/generic/lib/utils/irqchip/aplic.o
 CC        platform/generic/lib/utils/irqchip/imsic.o
 CC        platform/generic/lib/utils/irqchip/plic.o
 CC        platform/generic/lib/utils/ipi/aclint_mswi.o
 CC        platform/generic/lib/utils/ipi/andes_plicsw.o
 CC        platform/generic/lib/utils/ipi/fdt_ipi.o
 CC        platform/generic/lib/utils/ipi/fdt_ipi_drivers.o
 CC        platform/generic/lib/utils/ipi/fdt_ipi_mswi.o
 CC        platform/generic/lib/utils/ipi/fdt_ipi_plicsw.o
 CC        platform/generic/lib/utils/i2c/i2c.o
 CC        platform/generic/lib/utils/i2c/fdt_i2c.o
 CC        platform/generic/lib/utils/i2c/fdt_i2c_adapter_drivers.o
 CC        platform/generic/lib/utils/i2c/fdt_i2c_sifive.o
 CC        platform/generic/lib/utils/i2c/fdt_i2c_dw.o
 CC        platform/generic/lib/utils/i2c/dw_i2c.o
 CC        platform/generic/lib/utils/gpio/fdt_gpio.o
 CC        platform/generic/lib/utils/gpio/fdt_gpio_drivers.o
 CC        platform/generic/lib/utils/gpio/fdt_gpio_designware.o
 CC        platform/generic/lib/utils/gpio/fdt_gpio_sifive.o
 CC        platform/generic/lib/utils/gpio/fdt_gpio_starfive.o
 CC        platform/generic/lib/utils/gpio/gpio.o
 CC        platform/generic/lib/utils/fdt/fdt_domain.o
 CC        platform/generic/lib/utils/fdt/fdt_pmu.o
 CC        platform/generic/lib/utils/fdt/fdt_helper.o
 CC        platform/generic/lib/utils/fdt/fdt_fixup.o
 CC        platform/generic/thead/thead_c9xx_pmu.o
 AS        platform/generic/thead/thead_c9xx_tlb_trap_handler.o
 CC        platform/generic/thead/thead_c9xx_errata_tlb_flush.o
 CC        platform/generic/thead/thead-generic.o
 CC        platform/generic/starfive/jh7110.o
 CC        platform/generic/sophgo/sg2042.o
 CC        platform/generic/sifive/fu540.o
 CC        platform/generic/sifive/fu740.o
 CC        platform/generic/renesas/rzfive/rzfive.o
 CC        platform/generic/platform.o
 CC        platform/generic/platform_override_modules.o
 CC        platform/generic/andes/ae350.o
 AS        platform/generic/andes/sleep.o
 CC        platform/generic/andes/andes45-pma.o
 CC        platform/generic/andes/andes_sbi.o
 CC        platform/generic/andes/andes_pmu.o
 CC        platform/generic/allwinner/sun20i-d1.o
 AR        platform/generic/lib/libplatsbi.a
 AS        platform/generic/firmware/payloads/test_head.o
 CC        platform/generic/firmware/payloads/test_main.o
 MERGE     platform/generic/firmware/payloads/test.o
 ELF       platform/generic/firmware/payloads/test.elf
 OBJCOPY   platform/generic/firmware/payloads/test.bin
 AS        platform/generic/firmware/fw_dynamic.o
 ELF       platform/generic/firmware/fw_dynamic.elf
 OBJCOPY   platform/generic/firmware/fw_dynamic.bin
 AS        platform/generic/firmware/fw_jump.o
 ELF       platform/generic/firmware/fw_jump.elf
 OBJCOPY   platform/generic/firmware/fw_jump.bin
 AS        platform/generic/firmware/fw_payload.o
 ELF       platform/generic/firmware/fw_payload.elf
 OBJCOPY   platform/generic/firmware/fw_payload.bin

1.2 U-Boot

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➜  u-boot git:(master) ✗ make starfive_visionfive2_defconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
#
# configuration written to .config
#
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➜  u-boot git:(master) ✗ make OPENSBI=$OPENSBI
scripts/kconfig/conf  --syncconfig Kconfig
  UPD     include/config.h
  CFG     spl/u-boot.cfg
  GEN     spl/include/autoconf.mk
  CFG     u-boot.cfg
  GEN     include/autoconf.mk
  GEN     include/autoconf.mk.dep
  UPD     include/generated/timestamp_autogenerated.h
  ENVC    include/generated/env.txt
  ENVP    include/generated/env.in
  ENVT    include/generated/environment.h
  CC      lib/asm-offsets.s
  CC      arch/riscv/lib/asm-offsets.s
  PYMOD   rebuild
/home/lvision/Desktop/VisionFive/u-boot/scripts/dtc/pylibfdt/setup.py:40: SyntaxWarning: invalid escape sequence '\w'
  RE_KEY_VALUE = re.compile('(?P<key>\w+) *(?P<plus>[+])?= *(?P<value>.*)$')
  HOSTCC  scripts/dtc/dtc.o
  HOSTCC  scripts/dtc/flattree.o
......
  AR      spl/drivers/spi/built-in.o
  CC      spl/drivers/timer/timer-uclass.o
  CC      spl/drivers/timer/riscv_timer.o
  CC      spl/drivers/timer/riscv_aclint_timer.o
  AR      spl/drivers/timer/built-in.o
  AR      spl/drivers/built-in.o
  AR      spl/dts/built-in.o
  CC      spl/fs/fs_internal.o
  AR      spl/fs/built-in.o
  LDS     spl/u-boot-spl.lds
  LD      spl/u-boot-spl
  OBJCOPY spl/u-boot-spl-nodtb.bin
mkdir -p spl/dts/
  FDTGREP spl/dts/dt-spl.dtb
  COPY    spl/u-boot-spl.dtb
  CAT     spl/u-boot-spl-dtb.bin
  COPY    spl/u-boot-spl.bin
  SYM     spl/u-boot-spl.sym
  MKIMAGE u-boot.img
  COPY    u-boot.dtb
  MKIMAGE u-boot-dtb.img
  BINMAN  .binman_stamp
  OFCHK   .config
➜  u-boot git:(master) ✗

1.3 Linux Kernel

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➜  linux make defconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/confdata.o
  HOSTCC  scripts/kconfig/expr.o
  LEX     scripts/kconfig/lexer.lex.c
  YACC    scripts/kconfig/parser.tab.[ch]
  HOSTCC  scripts/kconfig/lexer.lex.o
  HOSTCC  scripts/kconfig/menu.o
  HOSTCC  scripts/kconfig/parser.tab.o
  HOSTCC  scripts/kconfig/preprocess.o
  HOSTCC  scripts/kconfig/symbol.o
  HOSTCC  scripts/kconfig/util.o
  HOSTLD  scripts/kconfig/conf
*** Default configuration is based on 'defconfig'
#
# No change to .config
#
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➜  linux make menuconfig
  HOSTCC  scripts/kconfig/mconf.o
  HOSTCC  scripts/kconfig/lxdialog/checklist.o
  HOSTCC  scripts/kconfig/lxdialog/inputbox.o
  HOSTCC  scripts/kconfig/lxdialog/menubox.o
  HOSTCC  scripts/kconfig/lxdialog/textbox.o
  HOSTCC  scripts/kconfig/lxdialog/util.o
  HOSTCC  scripts/kconfig/lxdialog/yesno.o
  HOSTLD  scripts/kconfig/mconf


*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.

By configuring menuconfig, we ignore building ALL other SoCs but tick VisionFive ONLY.

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➜  linux make -j16
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/dtc/flattree.o
  HOSTCC  scripts/dtc/dtc.o
  HOSTCC  scripts/dtc/fstree.o
  HOSTCC  scripts/dtc/livetree.o
  HOSTCC  scripts/dtc/data.o
  HOSTCC  scripts/dtc/treesource.o
  HOSTCC  scripts/dtc/srcpos.o
  HOSTCC  scripts/dtc/util.o
  HOSTCC  scripts/dtc/checks.o
  YACC    scripts/dtc/dtc-parser.tab.[ch]
  LEX     scripts/dtc/dtc-lexer.lex.c
  HOSTCC  scripts/dtc/libfdt/fdt.o
  HOSTCC  scripts/dtc/libfdt/fdt_ro.o
  HOSTCC  scripts/dtc/libfdt/fdt_wip.o
  HOSTCC  scripts/dtc/libfdt/fdt_sw.o
  HOSTCC  scripts/dtc/libfdt/fdt_rw.o
  HOSTCC  scripts/dtc/libfdt/fdt_strerror.o
  HOSTCC  scripts/dtc/libfdt/fdt_empty_tree.o
  HOSTCC  scripts/dtc/libfdt/fdt_addresses.o
  HOSTCC  scripts/dtc/libfdt/fdt_overlay.o
  HOSTCC  scripts/dtc/fdtoverlay.o
  HOSTCC  scripts/dtc/dtc-lexer.lex.o
  HOSTCC  scripts/dtc/dtc-parser.tab.o
  HOSTLD  scripts/dtc/fdtoverlay
  HOSTLD  scripts/dtc/dtc
......
  LD [M]  net/8021q/8021q.ko
  LD [M]  net/bridge/br_netfilter.ko
  LD [M]  net/llc/llc.ko
  LD [M]  net/bridge/bridge.ko
  NM      .tmp_vmlinux.kallsyms1.syms
  KSYMS   .tmp_vmlinux.kallsyms1.S
  AS      .tmp_vmlinux.kallsyms1.S
  LD      .tmp_vmlinux.kallsyms2
  NM      .tmp_vmlinux.kallsyms2.syms
  KSYMS   .tmp_vmlinux.kallsyms2.S
  AS      .tmp_vmlinux.kallsyms2.S
  LD      vmlinux
  NM      System.map
  SORTTAB vmlinux
  OBJCOPY arch/riscv/boot/Image
  GZIP    arch/riscv/boot/Image.gz
  Kernel: arch/riscv/boot/Image.gz is ready

1.4 Busybox

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➜  busybox make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv defconfig
scripts/kconfig/conf -d Config.in
*
* Busybox Configuration
*
*
* Settings
*
Enable compatibility for full-blown desktop systems (8kb) (DESKTOP) [Y/n/?] (NEW) y
Provide compatible behavior for rare corner cases (bigger code) (EXTRA_COMPAT) [N/y/?] (NEW) n
Building for Fedora distribution (FEDORA_COMPAT) [N/y/?] (NEW) n
Enable obsolete features removed before SUSv3 (INCLUDE_SUSv2) [Y/n/?] (NEW) y
Support --long-options (LONG_OPTS) [Y/?] (NEW) y
Show applet usage messages (SHOW_USAGE) [Y/n/?] (NEW) y
  Show verbose applet usage messages (FEATURE_VERBOSE_USAGE) [Y/n/?] (NEW) y
  Store applet usage messages in compressed form (FEATURE_COMPRESS_USAGE) [Y/n/?] (NEW) y
Support files > 2 GB (LFS) [Y/n/?] (NEW) y
  Support 64bit wide time types (TIME64) [Y/n/?] (NEW) y
Support PAM (Pluggable Authentication Modules) (PAM) [N/y/?] (NEW) n
Use the devpts filesystem for Unix98 PTYs (FEATURE_DEVPTS) [Y/n/?] (NEW) y
Support utmp file (FEATURE_UTMP) [Y/n/?] (NEW) y
  Support wtmp file (FEATURE_WTMP) [Y/n/?] (NEW) y
Support writing pidfiles (FEATURE_PIDFILE) [Y/n/?] (NEW) y
  Directory for pidfiles (PID_FILE_PATH) [/var/run] (NEW) /var/run
Include busybox applet (BUSYBOX) [Y/n/?] (NEW) y
  Support --show SCRIPT (FEATURE_SHOW_SCRIPT) [Y/n] (NEW) y
  Support --install [-s] to install applet links at runtime (FEATURE_INSTALLER) [Y/n/?] (NEW) y
Don't use /usr (INSTALL_NO_USR) [N/y/?] (NEW) n
Drop SUID state for most applets (FEATURE_SUID) [Y/n/?] (NEW) y
  Enable SUID configuration via /etc/busybox.conf (FEATURE_SUID_CONFIG) [Y/n/?] (NEW) y
    Suppress warning message if /etc/busybox.conf is not readable (FEATURE_SUID_CONFIG_QUIET) [Y/n/?] (NEW) y
exec prefers applets (FEATURE_PREFER_APPLETS) [N/y/?] (NEW) n
Path to busybox executable (BUSYBOX_EXEC_PATH) [/proc/self/exe] (NEW) /proc/self/exe
Support NSA Security Enhanced Linux (SELINUX) [N/y/?] (NEW) n
Clean up all memory before exiting (usually not needed) (FEATURE_CLEAN_UP) [N/y/?] (NEW) n
Support LOG_INFO level syslog messages (FEATURE_SYSLOG_INFO) [Y/n/?] (NEW) y
*
*
* Build Options
*
......
......
......
*
* Options common to all shells
*
POSIX math support (FEATURE_SH_MATH) [Y/n/?] (NEW) y
  Extend POSIX math support to 64 bit (FEATURE_SH_MATH_64) [Y/n/?] (NEW) y
  Support BASE#nnnn literals (FEATURE_SH_MATH_BASE) [Y/n] (NEW) y
Hide message on interactive shell startup (FEATURE_SH_EXTRA_QUIET) [Y/n/?] (NEW) y
Standalone shell (FEATURE_SH_STANDALONE) [N/y/?] (NEW) n
Run 'nofork' applets directly (FEATURE_SH_NOFORK) [N/y/?] (NEW) n
read -t N.NNN support (+110 bytes) (FEATURE_SH_READ_FRAC) [Y/n/?] (NEW) y
Use $HISTFILESIZE (FEATURE_SH_HISTFILESIZE) [Y/n/?] (NEW) y
Embed scripts in the binary (FEATURE_SH_EMBEDDED_SCRIPTS) [Y/n/?] (NEW) y
*
* System Logging Utilities
*
klogd (6.2 kb) (KLOGD) [Y/n/?] (NEW) y
  *
  * klogd should not be used together with syslog to kernel printk buffer
  *
  Use the klogctl() interface (FEATURE_KLOGD_KLOGCTL) [Y/n/?] (NEW) y
logger (6.5 kb) (LOGGER) [Y/n/?] (NEW) y
logread (5 kb) (LOGREAD) [Y/n/?] (NEW) y
  Double buffering (FEATURE_LOGREAD_REDUCED_LOCKING) [Y/n/?] (NEW) y
syslogd (14 kb) (SYSLOGD) [Y/n/?] (NEW) y
  Rotate message files (FEATURE_ROTATE_LOGFILE) [Y/n/?] (NEW) y
  Remote Log support (FEATURE_REMOTE_LOG) [Y/n/?] (NEW) y
  Support -D (drop dups) option (FEATURE_SYSLOGD_DUP) [Y/n/?] (NEW) y
  Support syslog.conf (FEATURE_SYSLOGD_CFG) [Y/n/?] (NEW) y
  Include milliseconds in timestamps (FEATURE_SYSLOGD_PRECISE_TIMESTAMPS) [N/y/?] (NEW) n
  Read buffer size in bytes (FEATURE_SYSLOGD_READ_BUFFER_SIZE) [256] (NEW) 256
  Circular Buffer support (FEATURE_IPC_SYSLOG) [Y/n/?] (NEW) y
    Circular buffer size in Kbytes (minimum 4KB) (FEATURE_IPC_SYSLOG_BUFFER_SIZE) [16] (NEW) 16
  Linux kernel printk buffer support (FEATURE_KMSG_SYSLOG) [Y/n/?] (NEW) y
➜  busybox 
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➜  busybox make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv menuconfig
scripts/kconfig/mconf Config.in
#
# using defaults found in .config
#


*** End of configuration.
*** Execute 'make' to build the project or try 'make help'.
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➜  busybox make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv -j8       
  LD      archival/built-in.o
  CC      archival/bzip2.o
  CC      archival/bbunzip.o
  CC      archival/chksum_and_xwrite_tar_header.o
  CC      archival/dpkg.o
  CC      archival/cpio.o
  CC      archival/dpkg_deb.o
  LD      archival/libarchive/built-in.o
  CC      archival/gzip.o
  CC      archival/libarchive/common.o
  CC      archival/lzop.o
  CC      archival/libarchive/data_align.o
  LD      console-tools/built-in.o
  CC      console-tools/chvt.o
  CC      console-tools/clear.o
  CC      console-tools/deallocvt.o
  CC      archival/libarchive/data_extract_all.o
  LD      coreutils/built-in.o
  CC      coreutils/basename.o
  CC      coreutils/cat.o
  CC      console-tools/dumpkmap.o
archival/libarchive/data_extract_all.c: In function ‘data_extract_all’:
archival/libarchive/data_extract_all.c:235:25: warning: ignoring return value of ‘chown’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  235 |                         chown(dst_name, uid, gid);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~
  LD      coreutils/libcoreutils/built-in.o
  CC      archival/libarchive/data_extract_to_command.o
  CC      archival/libarchive/data_extract_to_stdout.o
  CC      coreutils/libcoreutils/cp_mv_stat.o
  LD      debianutils/built-in.o
  CC      debianutils/pipe_progress.o
console-tools/dumpkmap.c: In function ‘dumpkmap_main’:
......
......
......
  CC      libbb/verror_msg.o
util-linux/mkfs_minix.c: In function ‘get_list_blocks’:
util-linux/mkfs_minix.c:532:17: warning: ignoring return value of ‘fscanf’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  532 |                 fscanf(listfile, "%lu\n", &blockno);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CC      libbb/vfork_daemon_rexec.o
  CC      libbb/warn_ignoring_args.o
  CC      util-linux/mkswap.o
  CC      util-linux/more.o
  CC      libbb/wfopen.o
  CC      util-linux/mount.o
  CC      libbb/wfopen_input.o
  CC      libbb/write.o
  CC      util-linux/mountpoint.o
  CC      libbb/xatonum.o
  CC      util-linux/nsenter.o
  CC      util-linux/pivot_root.o
  CC      util-linux/rdate.o
  CC      libbb/xconnect.o
  CC      util-linux/rdev.o
  CC      libbb/xfunc_die.o
  CC      util-linux/readprofile.o
  CC      libbb/xfuncs.o
  CC      util-linux/renice.o
  CC      libbb/xfuncs_printf.o
  CC      util-linux/rev.o
  CC      libbb/xgetcwd.o
  CC      util-linux/rtcwake.o
  CC      util-linux/script.o
  CC      libbb/xgethostbyname.o
  CC      libbb/xreadlink.o
  CC      libbb/xrealloc_vector.o
  CC      util-linux/scriptreplay.o
  CC      util-linux/setarch.o
  CC      libbb/xregcomp.o
  CC      util-linux/setpriv.o
  CC      util-linux/setsid.o
  CC      util-linux/swaponoff.o
  CC      util-linux/switch_root.o
  CC      util-linux/taskset.o
  CC      util-linux/uevent.o
  CC      util-linux/umount.o
  AR      libbb/lib.a
  CC      util-linux/unshare.o
  CC      util-linux/wall.o
util-linux/unshare.c: In function ‘unshare_main’:
util-linux/unshare.c:295:25: warning: ignoring return value of ‘read’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  295 |                         read(fdp.rd, ns_ctx_list, 1); /* ...using bogus buffer */
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
  AR      util-linux/lib.a
  LINK    busybox_unstripped
Trying libraries: m resolv rt
 Library m is needed, can't exclude it (yet)
 Library resolv is needed, can't exclude it (yet)
 Library rt is not needed, excluding it
 Library m is needed, can't exclude it (yet)
 Library resolv is needed, can't exclude it (yet)
Final link with: m resolv
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➜  busybox make CONFIG_PREFIX=./../busybox_rootfs install
  ./../busybox_rootfs//bin/arch -> busybox
  ./../busybox_rootfs//bin/ash -> busybox
  ./../busybox_rootfs//bin/base32 -> busybox
  ./../busybox_rootfs//bin/base64 -> busybox
  ./../busybox_rootfs//bin/cat -> busybox
  ./../busybox_rootfs//bin/chattr -> busybox
  ./../busybox_rootfs//bin/chgrp -> busybox
  ./../busybox_rootfs//bin/chmod -> busybox
  ./../busybox_rootfs//bin/chown -> busybox
  ./../busybox_rootfs//bin/conspy -> busybox
  ./../busybox_rootfs//bin/cp -> busybox
  ./../busybox_rootfs//bin/cpio -> busybox
  ./../busybox_rootfs//bin/cttyhack -> busybox
  ./../busybox_rootfs//bin/date -> busybox
......
......
......
  ./../busybox_rootfs//usr/sbin/ubirmvol -> ../../bin/busybox
  ./../busybox_rootfs//usr/sbin/ubirsvol -> ../../bin/busybox
  ./../busybox_rootfs//usr/sbin/ubiupdatevol -> ../../bin/busybox
  ./../busybox_rootfs//usr/sbin/udhcpd -> ../../bin/busybox


--------------------------------------------------
You will probably need to make your busybox binary
setuid root to ensure all configured applets will
work properly.
--------------------------------------------------
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➜  busybox mkdir -p initramfs/{bin,dev,etc,home,mnt,proc,sys,usr}
➜  busybox cd initramfs/dev
➜  dev sudo mknod sda b 8 0 
[sudo] password for lvision: 
mknod: sda: File exists
➜  dev sudo mknod console c 5 1
mknod: console: File exists
➜  dev cd ..
➜  initramfs cp -r ../../busybox_rootfs/* ./
➜  initramfs ll
total 2.3M
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:59 bin
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:57 dev
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 etc
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 home
-rwxrwxr-x 1 lvision lvision   73 Dec 16 03:00 init
lrwxrwxrwx 1 lvision lvision   11 Dec 16 02:59 linuxrc -> bin/busybox
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 mnt
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 proc
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:59 sbin
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 sys
drwxrwxr-x 4 lvision lvision 4.0K Dec 16 02:59 usr
➜  initramfs 
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➜  initramfs vim init

and put 

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#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
exec /bin/sh

in file init.

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➜  initramfs cat init 
#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
exec /bin/sh
➜  initramfs chmod +x init 
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➜  initramfs find . -print0 | cpio --null -ov --format=newc > initramfs.cpio 
.
./etc
./init
./busybox_rootfs
./busybox_rootfs/bin
./busybox_rootfs/bin/cpio
./busybox_rootfs/bin/ln
./busybox_rootfs/bin/su
./busybox_rootfs/bin/pwd
./busybox_rootfs/bin/gzip
./busybox_rootfs/bin/link
./busybox_rootfs/bin/lzop
./busybox_rootfs/bin/nice
./busybox_rootfs/bin/makemime
./busybox_rootfs/bin/fatattr
./busybox_rootfs/bin/busybox
......
......
......
./usr/sbin/sendmail
./usr/sbin/rtcwake
./usr/sbin/ftpd
./usr/sbin/adduser
./usr/sbin/nbd-client
./usr/sbin/dhcprelay
./usr/sbin/brctl
./usr/sbin/mim
./usr/sbin/udhcpd
./usr/sbin/nologin
./usr/sbin/ubidetach
./usr/sbin/addgroup
./usr/sbin/fdformat
./usr/sbin/crond
./sys
11511 blocks
➜  initramfs gzip ./initramfs.cpio
➜  initramfs ll
total 1.4M
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 03:58 bin
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:57 dev
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 etc
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 home
-rwxrwxr-x 1 lvision lvision   73 Dec 16 03:55 init
-rw-rw-r-- 1 lvision lvision 1.4M Dec 16 04:01 initramfs.cpio.gz
lrwxrwxrwx 1 lvision lvision   11 Dec 16 03:58 linuxrc -> bin/busybox
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 mnt
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 proc
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 03:58 sbin
drwxrwxr-x 2 lvision lvision 4.0K Dec 16 02:56 sys
drwxrwxr-x 4 lvision lvision 4.0K Dec 16 02:59 usr

2. Flashing

2.1 Prepare SD Disk

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➜  VisionFive sudo sgdisk --clear \
  --set-alignment=2 \
  --new=1:4096:8191 --change-name=1:spl --typecode=1:2E54B353-1271-4842-806F-E436D6AF6985\
  --new=2:8192:16383 --change-name=2:uboot --typecode=2:BC13C2FF-59E6-4262-A352-B275FD6F7172  \
  --new=3:16384:1654784 --change-name=3:system --typecode=3:EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 \
  /dev/sdb

Setting name!
partNum is 0
Setting name!
partNum is 1
Setting name!
partNum is 2
The operation has completed successfully.

2.2 Flash the SD Card

Including ALL the above, say:

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➜  VisionFive sudo dd if=./u-boot/spl/u-boot-spl.bin.normal.out of=/dev/sdb1
275+1 records in
275+1 records out
140919 bytes (141 kB, 138 KiB) copied, 0.111194 s, 1.3 MB/s
➜  VisionFive sudo dd if=./u-boot/u-boot.itb of=/dev/sdb2
1994+1 records in
1994+1 records out
1020947 bytes (1.0 MB, 997 KiB) copied, 0.0101341 s, 101 MB/s
➜  VisionFive sudo mount /dev/sdb3 /mnt/
➜  VisionFive sudo cp ./u-boot/spl/u-boot-spl.bin.normal.out /mnt
➜  VisionFive sudo cp ./u-boot/u-boot.itb /mnt
➜  VisionFive sudo cp ./linux/arch/riscv/boot/Image.gz /mnt
➜  VisionFive sudo cp ./busybox/initramfs/initramfs.cpio.gz /mnt
➜  VisionFive sudo cp ./linux/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2-v1.3b.dtb /mnt

Then, we take a look at our built system currently under folder /mnt

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➜  VisionFive ll /mnt
total 9.2M
lrwxrwxrwx  1 root root    7 Dec 15 00:10 bin -> usr/bin
drwxr-xr-x  3 root root 4.0K Dec 15 03:38 boot
drwxr-xr-x  4 root root 4.0K Dec 15 00:10 dev
drwxr-xr-x 84 root root 4.0K Dec 15 00:26 etc
drwxr-xr-x  3 root root 4.0K Dec 15 00:26 home
-rw-r--r--  1 root root 6.6M Dec 16 04:12 Image.gz
-rw-r--r--  1 root root 1.4M Dec 16 04:13 initramfs.cpio.gz
-rw-r--r--  1 root root  30K Dec 16 04:14 jh7110-starfive-visionfive-2-v1.3b.dtb
lrwxrwxrwx  1 root root    7 Dec 15 00:10 lib -> usr/lib
drwx------  2 root root  16K Dec 15 03:38 lost+found
drwxr-xr-x  2 root root 4.0K Dec 15 00:10 media
drwxr-xr-x  2 root root 4.0K Dec 15 00:10 mnt
drwxr-xr-x  3 root root 4.0K Dec 15 00:26 opt
drwxr-xr-x  2 root root 4.0K Jul 27 22:43 proc
drwx------  3 root root 4.0K Dec 15 00:12 root
drwxr-xr-x  2 root root 4.0K Jul 27 22:43 run
lrwxrwxrwx  1 root root    8 Dec 15 00:10 sbin -> usr/sbin
drwxr-xr-x  2 root root 4.0K Dec 15 00:10 srv
drwxr-xr-x  2 root root 4.0K Jul 27 22:43 sys
drwxrwxrwt  2 root root 4.0K Dec 15 00:25 tmp
-rw-r--r--  1 root root 998K Dec 16 04:11 u-boot.itb
-rw-r--r--  1 root root 138K Dec 16 04:11 u-boot-spl.bin.normal.out
drwxr-xr-x 11 root root 4.0K Dec 15 00:10 usr
drwxr-xr-x 12 root root 4.0K Dec 15 00:21 var