# U-BOOT

git clone https://github.com/stanley-666/u-boot.git

sudo apt-get update
sudo apt-get install -y \
    build-essential bison flex swig python3-dev \
    libssl-dev libgnutls28-dev \
    libncurses5-dev device-tree-compiler \
    pkg-config libyaml-dev

## 檔案結構

u-boot/
 ├── arch
       └── riscv
             └── cpu
 ├── board/
 │    └── digilent <vendor>
 │            └──genesys2/
 │                  ├── Makefile
 │                  │── Kconfig 
 │                  └── genesys2.c   <-- 這裡放你的 board_init / dram_init
 ├── configs/
 │    └── genesys2_defconfig
 ├── include/
 │    └── configs/
 │         └── genesys2.h   <-- 這裡放你的 CONFIG_SYS_TEXT_BASE、DDR addr 等

## 編譯過程
可以換最新的rvv compiler來編譯u-boot
產生u-boot.bin, dtb

make CROSS_COMPILE=riscv64-linux-gnu- genesys2_defconfig
make CROSS_COMPILE=riscv64-linux-gnu- -j$(nproc)

## Reference

https://ithelp.ithome.com.tw/articles/10343682