From 17f96faf501850e8e493e8f0943373228d90d26a Mon Sep 17 00:00:00 2001 From: Damien Le Moal Date: Wed, 20 Jul 2022 11:45:29 +0900 Subject: [PATCH] board: Add Sipeed MAIX-Dock board support Add two buildroot configuration files to build a minimal Linux environment for the Sipeed MAIX-Dock board. The configurations are: * sipeed_maix_dock_defconfig: Build a bootable kernel image with an embedded initramfs root file system. The image built can be flashed to the board as is and does not require a boot loader. This configuration uses the tiny busybox configuration defined in board/canaan/k210-soc/busybox-tiny.config. * sipeed_maix_dock_sdcard_defconfig: Build a kernel image with a root file system on the SD card and using U-Boot as the boot loader. This uses the default busybox minimal configuration. Both configurations also enable the kflash and pyserial-miniterm host tools for flashing image files to the board and opening a terminal console. The readme.txt file documents how to build and boot the Sipeed MAIX-Dock board with these configurations. Signed-off-by: Damien Le Moal Signed-off-by: Arnout Vandecappelle (Essensium/Mind) --- DEVELOPERS | 2 + board/sipeed/maix-dock/linux-cpio.config | 2 + board/sipeed/maix-dock/readme.txt | 321 ++++++++++++++++++++++ configs/sipeed_maix_dock_defconfig | 39 +++ configs/sipeed_maix_dock_sdcard_defconfig | 57 ++++ 5 files changed, 421 insertions(+) create mode 100644 board/sipeed/maix-dock/linux-cpio.config create mode 100644 board/sipeed/maix-dock/readme.txt create mode 100644 configs/sipeed_maix_dock_defconfig create mode 100644 configs/sipeed_maix_dock_sdcard_defconfig diff --git a/DEVELOPERS b/DEVELOPERS index 976fd87326..0494b723c1 100644 --- a/DEVELOPERS +++ b/DEVELOPERS @@ -638,6 +638,8 @@ F: configs/sipeed_maix_bit_defconfig F: configs/sipeed_maix_bit_sdcard_defconfig F: configs/sipeed_maixduino_defconfig F: configs/sipeed_maixduino_sdcard_defconfig +F: configs/sipeed_maix_dock_defconfig +F: configs/sipeed_maix_dock_sdcard_defconfig N: Daniel Nicoletti F: package/cutelyst/ diff --git a/board/sipeed/maix-dock/linux-cpio.config b/board/sipeed/maix-dock/linux-cpio.config new file mode 100644 index 0000000000..b1ca3166f8 --- /dev/null +++ b/board/sipeed/maix-dock/linux-cpio.config @@ -0,0 +1,2 @@ +CONFIG_SOC_CANAAN_K210_DTB_BUILTIN=y +CONFIG_SOC_CANAAN_K210_DTB_SOURCE="sipeed_maix_dock" diff --git a/board/sipeed/maix-dock/readme.txt b/board/sipeed/maix-dock/readme.txt new file mode 100644 index 0000000000..5971f6e50b --- /dev/null +++ b/board/sipeed/maix-dock/readme.txt @@ -0,0 +1,321 @@ +Sipeed MAIX-Dock Board +====================== + +The Sipeed MAXI-Dock board is a dual-core RISC-V 64-bits board based on the +Canaan Kendryte K210 SoC. + +Prerequisite +------------ + +In order to use the kflash utility to program this board, the user must have +access to the board USB serial device file. The simplest way to do this is to +add your user to the same group as this device file. Assume the device file is +/dev/ttyUSB0, first identify the device group name. In most cases, it is +either "dialout" or "uucp". Also verify that read-write access is enabled for +the group: + +``` +$ ls -l /dev/ttyUSB0 +crw-rw---- 1 root dialout 188, 0 May 26 13:48 /dev/ttyUSB0 +``` + +Then add yourself to that group (dialout in this example): + +``` +$ sudo usermod -a -G dialout $(whoami) +``` + +To enable the above, it is sometimes necessary to logout and login again. + +Buildroot Configuration +----------------------- + +Two buildroot configuration files are provided: + +(1) Direct Linux Kernel Boot + +This is defined by the sipeed_maix_dock_defconfig configuration. This +configuration allows building a bootable kernel image with a built-in initramfs +root file system (the board SD card is not used). The built kernel image can be +flashed directly to the board ROM for direct booting. No boot loader is +required. + +(2) U-Boot SD-Card Boot + +The sipeed_maix_dock_sdcard_defconfig configuration allows building a kernel +image with the root file system on the board SD card. U-Boot is used as the +boot loader. + +Note: U-Boot does not natively support the Sipeed MAIX-Dock board. However, the +board and device tree differences with the Sipeed MAIX-Bit board are small +enough for U-Boot to work. + +Both configuration files will also compile the pyserial-miniterm host tool open +a serial terminal console for the board. + +Direct Linux Kernel Boot +------------------------- + +Using the sipeed_maix_dock_defconfig configuration, the bootable kernel binary +image is built as follows. + +``` +$ make sipeed_maix_dock_defconfig +$ make +``` + +Both configuration files will also compile and install the kflash and +pyserial-miniterm host utilities to program bootable image files to the board +and open a serial terminal console. + +``` +$ output/host/bin/kflash -b 1500000 -p /dev/ttyUSB0 -t output/images/loader.bin +``` + +Once the kernel image file is fully programmed, a terminal console is open and +the board can be rebooted by pressing the reset button on the board (if it does +not reboot automatically). + +The output will be similar to the following. + +``` +[ 0.000000] Linux version 5.18.0 (foo@bar.com) (riscv64-buildroot-linux-uclibc-gcc.br_real (Buildroot 2022.02-560-g6a2b542a09-dirty) 10.3.0, GNU ld (GNU Binutils) 2.32) #2 SMP Thu Apr 21 15:47:42 JST 2022 +[ 0.000000] Machine model: SiPeed MAIX Dock +[ 0.000000] earlycon: sifive0 at MMIO 0x0000000038000000 (options '115200n8') +[ 0.000000] printk: bootconsole [sifive0] enabled +[ 0.000000] Zone ranges: +[ 0.000000] DMA32 [mem 0x0000000080000000-0x00000000807fffff] +[ 0.000000] Normal empty +[ 0.000000] Movable zone start for each node +[ 0.000000] Early memory node ranges +[ 0.000000] node 0: [mem 0x0000000080000000-0x00000000807fffff] +[ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000000807fffff] +[ 0.000000] riscv: ISA extensions acdfim +[ 0.000000] riscv: ELF capabilities acdfim +[ 0.000000] percpu: max_distance=0x16000 too large for vmalloc space 0x0 +[ 0.000000] percpu: Embedded 11 pages/cpu s15264 r0 d29792 u45056 +[ 0.000000] percpu: wasting 10 pages per chunk +[ 0.000000] Built 1 zonelists, mobility grouping off. Total pages: 2020 +[ 0.000000] Kernel command line: earlycon console=ttySIF0 +[ 0.000000] Dentry cache hash table entries: 1024 (order: 1, 8192 bytes, linear) +[ 0.000000] Inode-cache hash table entries: 512 (order: 0, 4096 bytes, linear) +[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off +[ 0.000000] Memory: 5980K/8192K available (964K kernel code, 137K rwdata, 205K rodata, 546K init, 66K bss, 2212K reserved, 0K cma-reserved) +[ 0.000000] rcu: Hierarchical RCU implementation. +[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies. +[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0 +[ 0.000000] riscv-intc: 64 local interrupts mapped +[ 0.000000] plic: interrupt-controller@c000000: mapped 65 interrupts with 2 handlers for 4 contexts. +[ 0.000000] k210-clk: clock-controller: CPU running at 390 MHz +[ 0.000000] clint: timer@2000000: timer running at 7800000 Hz +[ 0.000000] clocksource: clint_clocksource: mask: 0xffffffffffffffff max_cycles: 0x3990be68b, max_idle_ns: 881590404272 ns +[ 0.000001] sched_clock: 64 bits at 7MHz, resolution 128ns, wraps every 4398046511054ns +[ 0.008187] Calibrating delay loop (skipped), value calculated using timer frequency.. 15.60 BogoMIPS (lpj=31200) +[ 0.018250] pid_max: default: 4096 minimum: 301 +[ 0.022859] Mount-cache hash table entries: 512 (order: 0, 4096 bytes, linear) +[ 0.029971] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes, linear) +[ 0.040238] rcu: Hierarchical SRCU implementation. +[ 0.045110] smp: Bringing up secondary CPUs ... +[ 0.050215] smp: Brought up 1 node, 2 CPUs +[ 0.054345] devtmpfs: initialized +[ 0.071112] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns +[ 0.080182] pinctrl core: initialized pinctrl subsystem +[ 0.120689] clocksource: Switched to clocksource clint_clocksource +[ 0.133165] workingset: timestamp_bits=62 max_order=11 bucket_order=0 +[ 0.181750] k210-sysctl 50440000.syscon: K210 system controller +[ 0.198612] k210-rst 50440000.syscon:reset-controller: K210 reset controller +[ 0.206644] cacheinfo: Unable to detect cache hierarchy for CPU 0 +[ 0.216569] i2c_dev: i2c /dev entries driver +[ 0.225905] k210-fpioa 502b0000.pinmux: K210 FPIOA pin controller +[ 0.238866] 38000000.serial: ttySIF0 at MMIO 0x38000000 (irq = 1, base_baud = 115200) is a SiFive UART v0 +[ 0.247778] printk: console [ttySIF0] enabled +[ 0.247778] printk: console [ttySIF0] enabled +[ 0.256459] printk: bootconsole [sifive0] disabled +[ 0.256459] printk: bootconsole [sifive0] disabled +[ 0.268225] panel@0 enforce active low on chipselect handle +[ 0.285238] Freeing unused kernel image (initmem) memory: 540K +[ 0.290372] This architecture does not have kernel memory protection. +[ 0.296807] Run /init as init process + __ _ + / / (_) ____ _ _ __ __ + / / | || _ \ | | | |\ \/ / + / /___| || | | || |_| | > < + /_____/|_||_| |_| \____|/_/\_\ + 64-bits RISC-V Kendryte K210 NOMMU + +/ # +``` + +To open a terminal console without re-flashing the board, the pyserial-miniterm +host tool can be used. + +``` +$ output/host/bin/pyserial-miniterm --raw --eol=LF /dev/ttyUSB0 115200 +``` + +The options "--raw" and "--eol=LF" are added here to avoid a double carriage +return each time a command is entered. + + +U-Boot SD-Card Boot +------------------- + +The build procedure is similar to the built-in initramfs case. + +``` +$ make sipeed_maix_dock_sdcard_defconfig +$ make +``` + +The build process will generate two files under the output/images directory. + +* sdcard.img: The image file for the SD card filesystem. This image has 2 + partitions. The first partition is a vfat partition containing the kernel + uImage and the board device tree binary. The second partition is the root + filesystem with busybox installed. The second partition is formatted using + ext2 (rev1). + +* uboot.bin: U-Boot bootable binary to load and boot the kernel from the SD + card. + +The SD card can be prepared by writing the sdcard.img file, as follows. + +``` +$ sudo dd if=output/images/sdcard.img of=/dev/sdX bs=1M +$ sync +$ eject /dev/sdX +``` + +Where /dev/sdX is the device file name of the SD card. Once completed, the SD +card can be inserted into the board and the U-Boot binary image written to the +board boot flash using the kflash utility. + +``` +$ output/host/bin/kflash -b 1500000 -p /dev/ttyUSB0 -t output/images/u-boot.bin +``` + +The above command will program U-Boot image to the board boot ROM and open a +terminal console once the u-boot.bin file is fully programmed. Reboot into the +newly programmed environment by pressing the board reset button if it does not +reboot automatically. + +The output will be similar to the following. + +``` +U-Boot 2022.04 (Apr 21 2022 - 15:59:50 +0900) + +DRAM: 8 MiB +Core: 34 devices, 17 uclasses, devicetree: separate +WDT: Not starting watchdog@50400000 +MMC: spi@53000000:slot@0: 0 +Loading Environment from SPIFlash... SF: Detected w25q128fw with page size 256 Bytes, erase size 4 KiB, total 16 MiB +*** Warning - bad CRC, using default environment + +In: serial@38000000 +Out: serial@38000000 +Err: serial@38000000 +Hit any key to stop autoboot: 0 +1717730 bytes read in 957 ms (1.7 MiB/s) +10382 bytes read in 11 ms (920.9 KiB/s) +## Booting kernel from Legacy Image at 80060000 ... + Image Name: Linux + Image Type: RISC-V Linux Kernel Image (uncompressed) + Data Size: 1717666 Bytes = 1.6 MiB + Load Address: 80000000 + Entry Point: 80000000 + Verifying Checksum ... OK +## Flattened Device Tree blob at 80400000 + Booting using the fdt blob at 0x80400000 + Loading Kernel Image + Loading Device Tree to 00000000803fa000, end 00000000803ff88d ... OK + +Starting kernel ... + +[ 0.000000] Linux version 5.18.0 (foo@bar.com) (riscv64-buildroot-linux-uclibc-gcc.br_real (Buildroot 2022.02-560-g6a2b542a09-dirty) 10.3.0, GNU ld (GNU Binutils) 2.32) #1 SMP Thu Apr 21 16:00:03 JST 2022 +[ 0.000000] Machine model: SiPeed MAIX Dock +[ 0.000000] earlycon: sifive0 at MMIO 0x0000000038000000 (options '115200n8') +[ 0.000000] printk: bootconsole [sifive0] enabled +[ 0.000000] Zone ranges: +[ 0.000000] DMA32 [mem 0x0000000080000000-0x00000000807fffff] +[ 0.000000] Normal empty +[ 0.000000] Movable zone start for each node +[ 0.000000] Early memory node ranges +[ 0.000000] node 0: [mem 0x0000000080000000-0x00000000807fffff] +[ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000000807fffff] +[ 0.000000] riscv: ISA extensions acdfim +[ 0.000000] riscv: ELF capabilities acdfim +[ 0.000000] percpu: max_distance=0x16000 too large for vmalloc space 0x0 +[ 0.000000] percpu: Embedded 11 pages/cpu s15392 r0 d29664 u45056 +[ 0.000000] percpu: wasting 10 pages per chunk +[ 0.000000] Built 1 zonelists, mobility grouping off. Total pages: 2020 +[ 0.000000] Kernel command line: earlycon console=ttySIF0 root=/dev/mmcblk0p2 rootwait ro +[ 0.000000] Dentry cache hash table entries: 1024 (order: 1, 8192 bytes, linear) +[ 0.000000] Inode-cache hash table entries: 512 (order: 0, 4096 bytes, linear) +[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off +[ 0.000000] Memory: 6156K/8192K available (1180K kernel code, 151K rwdata, 239K rodata, 102K init, 69K bss, 2036K reserved, 0K cma-reserved) +[ 0.000000] rcu: Hierarchical RCU implementation. +[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies. +[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0 +[ 0.000000] riscv-intc: 64 local interrupts mapped +[ 0.000000] plic: interrupt-controller@c000000: mapped 65 interrupts with 2 handlers for 4 contexts. +[ 0.000000] k210-clk: clock-controller: CPU running at 390 MHz +[ 0.000000] clint: timer@2000000: timer running at 7800000 Hz +[ 0.000000] clocksource: clint_clocksource: mask: 0xffffffffffffffff max_cycles: 0x3990be68b, max_idle_ns: 881590404272 ns +[ 0.000001] sched_clock: 64 bits at 7MHz, resolution 128ns, wraps every 4398046511054ns +[ 0.008196] Calibrating delay loop (skipped), value calculated using timer frequency.. 15.60 BogoMIPS (lpj=31200) +[ 0.018256] pid_max: default: 4096 minimum: 301 +[ 0.022876] Mount-cache hash table entries: 512 (order: 0, 4096 bytes, linear) +[ 0.029980] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes, linear) +[ 0.040401] rcu: Hierarchical SRCU implementation. +[ 0.045379] smp: Bringing up secondary CPUs ... +[ 0.050494] smp: Brought up 1 node, 2 CPUs +[ 0.054656] devtmpfs: initialized +[ 0.072338] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns +[ 0.081415] pinctrl core: initialized pinctrl subsystem +[ 0.123902] clocksource: Switched to clocksource clint_clocksource +[ 0.136898] workingset: timestamp_bits=62 max_order=11 bucket_order=0 +[ 0.182570] k210-sysctl 50440000.syscon: K210 system controller +[ 0.198158] k210-rst 50440000.syscon:reset-controller: K210 reset controller +[ 0.207473] cacheinfo: Unable to detect cache hierarchy for CPU 0 +[ 0.219724] i2c_dev: i2c /dev entries driver +[ 0.230080] k210-fpioa 502b0000.pinmux: K210 FPIOA pin controller +[ 0.243091] 38000000.serial: ttySIF0 at MMIO 0x38000000 (irq = 1, base_baud = 115200) is a SiFive UART v0 +[ 0.252034] printk: console [ttySIF0] enabled +[ 0.252034] printk: console [ttySIF0] enabled +[ 0.260656] printk: bootconsole [sifive0] disabled +[ 0.260656] printk: bootconsole [sifive0] disabled +[ 0.272546] panel@0 enforce active low on chipselect handle +[ 0.308098] mmc_spi spi3.0: SD/MMC host mmc0, no WP, no poweroff, cd polling +[ 0.320197] Waiting for root device /dev/mmcblk0p2... +[ 0.344667] mmc0: host does not support reading read-only switch, assuming write-enable +[ 0.352020] mmc0: new SDHC card on SPI +[ 0.358566] mmcblk0: mmc0:0000 SA16G 14.5 GiB +[ 0.366866] random: fast init done +[ 0.371439] mmcblk0: p1 p2 +[ 0.391314] random: get_random_bytes called from 0x000000008009b7d2 with crng_init=1 +[ 0.400977] VFS: Mounted root (ext2 filesystem) readonly on device 179:2. +[ 0.410966] devtmpfs: mounted +[ 0.413521] Freeing unused kernel image (initmem) memory: 96K +[ 0.418944] This architecture does not have kernel memory protection. +[ 0.425370] Run /sbin/init as init process +[ 0.633502] random: crng init done + __ _ + / / (_) ____ _ _ __ __ + / / | || _ \ | | | |\ \/ / + / /___| || | | || |_| | > < + /_____/|_||_| |_| \____|/_/\_\ + 64-bits RISC-V Kendryte K210 NOMMU + +/ # +``` + +Of note is that the kernel mounts the SD card as read-only by default to avoid +corruptions of the ext2 root file system when the board is powered down. This +is recommended as this board does not support clean shutdown or halt. + +Similarly to the initramfs build case, a console can be open without +re-flashing the board using the host tool pyserial-miniterm. + +``` +$ output/host/bin/pyserial-miniterm --raw --eol=LF /dev/ttyUSB0 115200 +``` diff --git a/configs/sipeed_maix_dock_defconfig b/configs/sipeed_maix_dock_defconfig new file mode 100644 index 0000000000..0f30e8d38f --- /dev/null +++ b/configs/sipeed_maix_dock_defconfig @@ -0,0 +1,39 @@ +# Architecture +BR2_riscv=y +BR2_RISCV_64=y +BR2_riscv_custom=y +BR2_RISCV_ISA_CUSTOM_RVM=y +BR2_RISCV_ISA_CUSTOM_RVA=y +BR2_RISCV_ISA_CUSTOM_RVF=y +BR2_RISCV_ISA_CUSTOM_RVD=y +BR2_RISCV_ISA_CUSTOM_RVC=y +BR2_RISCV_ABI_LP64D=y + +# Patches +BR2_GLOBAL_PATCH_DIR="board/riscv/nommu/patches" + +# Binary format +# BR2_USE_MMU is not set +BR2_BINFMT_FLAT=y +BR2_BINFMT_FLAT_ONE=y +# BR2_TARGET_ENABLE_ROOT_LOGIN is not set + +# Kernel +BR2_LINUX_KERNEL=y +BR2_LINUX_KERNEL_CUSTOM_VERSION=y +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.18" +BR2_LINUX_KERNEL_DEFCONFIG="nommu_k210" +BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/sipeed/maix-dock/linux-cpio.config" +BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y +BR2_LINUX_KERNEL_IMAGE_NAME="loader.bin" + +# Packages +BR2_PACKAGE_HOST_PYTHON_KFLASH=y +BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config" +BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="board/canaan/k210-soc/busybox-tiny.config" +# BR2_PACKAGE_IFUPDOWN_SCRIPTS is not set + +# Filesystem +BR2_INIT_NONE=y +BR2_TARGET_ROOTFS_INITRAMFS=y +BR2_ROOTFS_OVERLAY="board/canaan/k210-soc/rootfs_overlay" diff --git a/configs/sipeed_maix_dock_sdcard_defconfig b/configs/sipeed_maix_dock_sdcard_defconfig new file mode 100644 index 0000000000..fdbca11590 --- /dev/null +++ b/configs/sipeed_maix_dock_sdcard_defconfig @@ -0,0 +1,57 @@ +# Architecture +BR2_riscv=y +BR2_RISCV_64=y +BR2_riscv_custom=y +BR2_RISCV_ISA_CUSTOM_RVM=y +BR2_RISCV_ISA_CUSTOM_RVA=y +BR2_RISCV_ISA_CUSTOM_RVF=y +BR2_RISCV_ISA_CUSTOM_RVD=y +BR2_RISCV_ISA_CUSTOM_RVC=y +BR2_RISCV_ABI_LP64D=y + +# Patches +BR2_GLOBAL_PATCH_DIR="board/riscv/nommu/patches" + +# System +# BR2_USE_MMU is not set +BR2_BINFMT_FLAT=y +BR2_BINFMT_FLAT_ONE=y +# BR2_TARGET_ENABLE_ROOT_LOGIN is not set + +# Kernel +BR2_LINUX_KERNEL=y +BR2_LINUX_KERNEL_CUSTOM_VERSION=y +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.18" +BR2_LINUX_KERNEL_DEFCONFIG="nommu_k210_sdcard" +BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/canaan/k210-soc/linux-sdcard.config" +BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y +BR2_LINUX_KERNEL_IMAGE_NAME="loader.bin" +BR2_LINUX_KERNEL_DTS_SUPPORT=y +BR2_LINUX_KERNEL_INTREE_DTS_NAME="canaan/sipeed_maix_dock" + +# Packages +BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config" +# BR2_PACKAGE_IFUPDOWN_SCRIPTS is not set + +# Filesystem +BR2_INIT_NONE=y +BR2_TARGET_ROOTFS_EXT2=y +BR2_TARGET_ROOTFS_EXT2_SIZE=64M +BR2_ROOTFS_OVERLAY="board/canaan/k210-soc/rootfs_overlay" +BR2_ROOTFS_POST_BUILD_SCRIPT="board/canaan/k210-soc/post-build.sh" +BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh" +BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/canaan/k210-soc/genimage.cfg" + +# Bootloader and related host tools +BR2_TARGET_UBOOT=y +BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y +BR2_TARGET_UBOOT_CUSTOM_VERSION=y +BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2022.04" +BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="board/canaan/k210-soc/uboot.config" +BR2_TARGET_UBOOT_BOARD_DEFCONFIG="sipeed_maix_bitm" +BR2_TARGET_UBOOT_FORMAT_BIN=y +BR2_PACKAGE_HOST_UBOOT_TOOLS=y +BR2_PACKAGE_HOST_GENIMAGE=y +BR2_PACKAGE_HOST_DOSFSTOOLS=y +BR2_PACKAGE_HOST_MTOOLS=y +BR2_PACKAGE_HOST_PYTHON_KFLASH=y