ARM编译大家都会,也很容易,毕竟ARM工具链已经很成熟了,但是RISC-V却要自己编译工具链,为什么不能用现成的?那就问为什么树莓派非要用这么怪的ARCH了.
第一步是编译工具链.
git clone https://github.com/riscv-collab/riscv-gnu-toolchain
cd riscv-gnu-toolchain && ./configure --with-arch=rv32imac_zicsr_zifencei_zba_zbb_zbkb_zbs --with-abi=ilp32
sudo make -j40接着就是编译SDK,在pico-examples库中就可以完成,需要先安装好环境.
git clone https://github.com/raspberrypi/pico-examples
cd pico-examples
mkdir build
cd build/
cmake -DCMAKE_BUILD_TYPE=Debug -DPICO_PLATFORM=rp2350-riscv -DPICO_BOARD=pico2 ..编译一个RP2350 Hello World.
taterli@taterli-desktop:~/pico-examples/build/hello_world$ make
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taterli@taterli-desktop:~/pico-examples/build/hello_world$ file usb/hello_usb.elf
usb/hello_usb.elf: ELF 32-bit LSB executable, UCB RISC-V, RVC, soft-float ABI, version 1 (SYSV), statically linked, with debug_info, not stripped
taterli@taterli-desktop:~/pico-examples/build/hello_world$ cp usb/hello_usb.uf2 /media/taterli/RP2350/
taterli@taterli-desktop:~/pico-examples/build/hello_world$ 编译结果
串口验证
如果项目涉及FreeRTOS,则需要使用树莓派官方目前维护的分支才可以.
git clone https://github.com/raspberrypi/FreeRTOS-Kernel
export FREERTOS_KERNEL_PATH=~/FreeRTOS需要重新cmake才能识别,最后跑一下Coremark.
https://github.com/protik09/CoreMark-RP2040
需要修改为单线程跑,因为目前多核支持还是不很完善.主要是core_portme.h,修改MULTITHREAD=1,使用Release进行编译,结果如下.
2K performance run parameters for coremark.
CoreMark Size : 666
Total ticks : 6657757
Total time (secs): 13.315515
Iterations/Sec : 225.301086
Iterations : 6000
Compiler version : GCC13.2.0
Compiler flags : og
Memory location : STACK
seedcrc : 0xe9f5
[0]crclist : 0xe714
[0]crcmatrix : 0x1fd7
[0]crcstate : 0x8e3a
[0]crcfinal : 0xa14c
Correct operation validated. See README.md for run and reporting rules.
CoreMark 1.0 : 225.301086 / GCC13.2.0 og / STACK作为对比,我也编译了ARM核测试,性能确实高很多.
2K performance run parameters for coremark.
CoreMark Size : 666
Total ticks : 13479668
Total time (secs): 13.479668
Iterations/Sec : 445.114820
Iterations : 6000
Compiler version : GCC13.2.1 20231009
Compiler flags : og
Memory location : STACK
seedcrc : 0xe9f5
[0]crclist : 0xe714
[0]crcmatrix : 0x1fd7
[0]crcstate : 0x8e3a
[0]crcfinal : 0xa14c
Correct operation validated. See README.md for run and reporting rules.
CoreMark 1.0 : 445.114820 / GCC13.2.1 20231009 og / STACK