The perfect emulation setup to study and develop the Linux kernel v5.4.3, kernel modules, QEMU, gem5 and x86_64, ARMv7 and ARMv8 userland and baremetal assembly, ANSI C, C++ and POSIX. GDB step debug and KGDB just work. Powered by Buildroot and crosstool-NG. Highly automated. Thoroughly documented. Automated tests. "Tested" in an Ubuntu 24.04 host.
Extract dhrystone from a buildroot package to a submodule, and pray that we have enough syscalls.
With this type of stuff, we are approaching a full Buildroot replacement, Buildroot only needs to do the GCC for us at some point.