交叉编译 U-Boot & OpenSBI for RISC-V

0. 背景信息 ~ background.

OpenSBI，全称 Open Source Supervisor Binary Interface，是由 Western Digital Corporation / 西数公司开发的一种 RISC-V SBI C 语言参考实现，在其 GitHub 仓库中已经提供了对应的构建指南。

1. 安装工具链/依赖包 ~ dependicies.

under Arch Linux WSL 2:

sudo pacman -S bc riscv64-linux-gnu-gcc qemu-full

2. 编译 U-Boot for RISC-V ~ Das U-Boot first.

编译 OpenSBI 之前首先需要编译 u-boot：

git clone https://github.com/u-boot/u-boot && cd u-boot
make CROSS_COMPILE=riscv64-linux-gnu- qemu-riscv64_smode_defconfig
make -j$(nproc)

3. 编译 OpenSBI for RISC-V ~ Compilation & Explosions!

git clone https://github.com/riscv-software-src/opensbi
CROSS_COMPILE=riscv64-linux-gnu- make -j$(nproc) PLATFORM=generic FW_PAYLOAD_PATH=../u-boot/u-boot.bin

4. 测试是否能够启动 ~ final tests.

qemu-system-riscv64 -M virt -m 1G -nographic -bios build/platform/generic/firmware/fw_payload.elf

OpenSBI v1.2-94-gc6a092c
   ____                    _____ ____ _____
  / __ \                  / ____|  _ \_   _|
 | |  | |_ __   ___ _ __ | (___ | |_) || |
 | |  | | '_ \ / _ \ '_ \ \___ \|  _ < | |
 | |__| | |_) |  __/ | | |____) | |_) || |_
  \____/| .__/ \___|_| |_|_____/|___/_____|
        | |
        |_|

Platform Name             : riscv-virtio,qemu
Platform Features         : medeleg
Platform HART Count       : 1
Platform IPI Device       : aclint-mswi
Platform Timer Device     : aclint-mtimer @ 10000000Hz
Platform Console Device   : uart8250
Platform HSM Device       : ---
Platform PMU Device       : ---
Platform Reboot Device    : sifive_test
Platform Shutdown Device  : sifive_test
Platform Suspend Device   : ---
Firmware Base             : 0x80000000
Firmware Size             : 232 KB
Firmware RW Offset        : 0x20000
Runtime SBI Version       : 1.0

Domain0 Name              : root
Domain0 Boot HART         : 0
Domain0 HARTs             : 0*
Domain0 Region00          : 0x0000000002000000-0x000000000200ffff M: (I,R,W) S/U: ()
Domain0 Region01          : 0x0000000080000000-0x000000008001ffff M: (R,X) S/U: ()
Domain0 Region02          : 0x0000000080020000-0x000000008003ffff M: (R,W) S/U: ()
Domain0 Region03          : 0x0000000000000000-0xffffffffffffffff M: (R,W,X) S/U: (R,W,X)
Domain0 Next Address      : 0x0000000080200000
Domain0 Next Arg1         : 0x0000000082200000
Domain0 Next Mode         : S-mode
Domain0 SysReset          : yes
Domain0 SysSuspend        : yes

Boot HART ID              : 0
Boot HART Domain          : root
Boot HART Priv Version    : v1.12
Boot HART Base ISA        : rv64imafdch
Boot HART ISA Extensions  : time,sstc
Boot HART PMP Count       : 16
Boot HART PMP Granularity : 4
Boot HART PMP Address Bits: 54
Boot HART MHPM Count      : 16
Boot HART MIDELEG         : 0x0000000000001666
Boot HART MEDELEG         : 0x0000000000f0b509


U-Boot 2023.04-rc5-00012-g6c617e082d (Apr 02 2023 - 23:50:15 +0800)

CPU:   rv64imafdch_zicsr_zifencei_zihintpause_zba_zbb_zbc_zbs_sstc
Model: riscv-virtio,qemu
DRAM:  1 GiB
Core:  25 devices, 12 uclasses, devicetree: board
Flash: 32 MiB
Loading Environment from nowhere... OK
In:    serial@10000000
Out:   serial@10000000
Err:   serial@10000000
Net:   No ethernet found.
Working FDT set to bf730950
Hit any key to stop autoboot:  0

Device 0: unknown device
scanning bus for devices...

Device 0: unknown device
No ethernet found.
No ethernet found.
=>

完事，收工。

Credits:

• opensbi/qemu_virt: QEMU RISC-V Virt Machine Platform
• BalanceTWK 的博客
• bigmagic - RISC-V 64 OpenSBI 启动过程