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I'm in the process of developing a native toolchain for my RISC-V Evaluation board. Currently, I have a cross-compiler provided by the vendor and a corresponding sysroot for the same board. Given my limited knowledge in toolchain building, I'm seeking some guidance or steps on how to create the native toolchain using these components. Some comments which are not directly related to the question:...

make ARCH=riscv CROSS_COMPILE=riscv64-unknown-linux-gnu- defconfig running this command results in error like *** Default configuration is based on 'defconfig' scripts/Kconfig.include:39: C compiler 'riscv64-unknown-linux-gnu-gcc' not found make[2]: *** [scripts/kconfig/Makefile:87: defconfig] Error 1 make[1]: *** [/home/sumanth/riscv/linux/Makefile:685: defconfig] Error 2 make: *** [Makefile:234: __sub-make] Error 2 also tried to install with sudo apt-get, but that doesn't worked out well. I'm using ubuntu 20.04 LTS. Can anyone help me...