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Simplify Duo SDK compilation for testing and debugging basic component updates.

Initialize repository, download toolchain, and update submodules.

$ ./init.sh

Generate standalone rtos fip.bin.

$ cd debugloader
$ cd sbi && ./build.sh #Generate sbi.bin

Select the RTOS bin to be used and replace the rtos.bin in the directory.

$ cd duoRVOS
$ make #Generate os.bin

Copy os.bin and sbi.bin to the fip directory.

$ cd fip
$ cp ../debugloader/sbi/fw_bin/sbi.bin ./
$ cp ../debugloader/duoRVOS/os.bin ./

Export the path to the host tools.

$ export PATH=`pwd`/../host-tools/gcc/riscv64-linux-musl-x86_64/bin:$PATH
$ export PATH=`pwd`/../host-tools/gcc/riscv64-elf-x86_64/bin:$PATH

Generate fip.bin.

$ make fsbl-build