Alternate to official instruction small BSP building.
The current official guide seems very uncomfortable :
- some software PhoenixCard (Windows) is need and it works crappy
- minimum size for sdcard is 16G
- large SDK >10G which is required to download from mega
so we ended up with alternate one.
Thanks to Samuel Holland [email protected] to make this thing easy.
- boot0 : zsbl (zero stage boot loader) that is used instead of u-boot SPL temporary
- opensbi : mostly mainline with small changes for Allwinner D1
- u-boot : very hacked but really better than official one
- linux : a solid work on the top of v5.15 (almost the most recent)
- riscv-gnu-toolchain : linux toolchain (currently used, can be replaced with Xuantie toolchain)
I've disabled emac and spi-nand in separate dts currently, they are no harm but still useless for LicheeRV RV Dock and pure LicheeRV, for 86 Panel a modification is also required, so we use sun20i-d1-nezha-lichee.dts instead of sun20i-d1-nezha.dts for now.
Install the prerequisites for the riscv-gnu-toolchain:
You don't have to do any other steps except the prerequisites.
Install additional prerequisites (may be required for fresh Ubuntu installation, thanks to Alexander Fomichev for sharing this):
apt install python3-distutils swig python3-dev libssl-dev python3-pkg-resources cpio
Fetch all submodules:
$ git submodule update --init --recursive
Bundled toochain:
$ make
Either provide TARGET_CROSS_PREFIX:
$ TARGET_CROSS_PREFIX=riscv64-unknown-linux-gnu make
Or simply nail it down in Makefile before ifndef TARGET_CROSS_PREFIX:
TARGET_CROSS_PREFIX=riscv64-unknown-linux-gnu
ifndef TARGET_CROSS_PREFIX
TARGET_CROSS_PREFIX = ${TOOLCHAIN_PREFIX}/bin/${TARGET_CROSS}
EXTERNAL_CROSS = 0
else
TARGET_CROSS_PATH := $(shell dirname $$(which $${TARGET_CROSS_PREFIX}-gcc))
TARGET_CROSS_PREFIX := ${TARGET_CROSS_PATH}/${TARGET_CROSS_PREFIX}
EXTERNAL_CROSS = 1
endif
$ make
After make we will need the following files:
- sun20i_d1_spl/nboot/boot0_sdcard_sun20iw1p1.bin
- u-boot.toc1
- u-boot/arch/riscv/dts/sun20i-d1-lichee-rv-dock.dtb
- build-linux/arch/riscv/boot/Image.gz
- initramfs.img.gz
I use dtb for Lichee RV Dock currently if you require something different edit toc1/toc1.cfg accordingly.
Example of making a card (assuming card is /dev/sdd and empty) :
# parted /dev/sdd --script mklabel gpt
# parted /dev/sdd --script mkpart primary ext2 40MiB 100MiB
# parted /dev/sdd --script mkpart primary ext4 100MiB 100%
# mkfs.ext2 /dev/sdd1 # partion with kernel, dtb, initramfs
# mkfs.ext4 /dev/sdd2 # partition for rootfs
# mount /dev/sdd1 /mnt/sdcard/
# cp build-linux/arch/riscv/boot/Image.gz /mnt/sdcard/
# cp initramfs.img.gz /mnt/sdcard/
# umount /mnt/sdcard
# dd if=sun20i_d1_spl/nboot/boot0_sdcard_sun20iw1p1.bin of=/dev/sdd bs=8192 seek=16
# dd if=u-boot.toc1 of=/dev/sdd bs=512 seek=32800 # large offset thats why we make first partion on 40 MiB
We are not using dtb from u-boot or linux kernel, as boot0 patches dtb with DRAM size and location, so we should use dtb patched - located at fdtcontroladdr.
U-boot commands (i haven't put a u-boot env yet - have to decide what i really need) :
> load mmc 0:1 ${kernel_addr_r} Image.gz
> load mmc 0:1 ${ramdisk_addr_r} initramfs.img.gz
> setenv bootargs "earlycon=sbi console=ttyS0,115200n8 root=/dev/ram0 rw rdinit=/init"
> booti ${kernel_addr_r} ${ramdisk_addr_r} ${fdtcontroladdr}
> load mmc 0:1 ${kernel_addr_r} Image.gz
> setenv bootargs "earlycon=sbi console=ttyS0,115200n8 root=/dev/mmcblk0p2"
> booti ${kernel_addr_r} - ${fdtcontroladdr}
Enjoy!
- https://linux-sunxi.org/Allwinner_Nezha - that's the first place to visit
- https://whycan.com/t_6440.html
- https://whycan.com/t_7711_2.html
- https://wiki.sipeed.com/hardware/zh/lichee/RV/flash.html
- https://github.com/T-head-Semi/riscv-aosp
- https://fedoraproject.org/wiki/Architectures/RISC-V/Allwinner
- https://linux-sunxi.org/Sipeed_Lichee_RV
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