This is the simplest version of Rift2Core. Rift2300 has no L2 cache, no L1 ICache, no L2 TLB, no support for RISCV64-M, has the smallest L1 dcache. But It can pass the riscv-isa-test. And it can boot Linux.(In theory, I will try it when I am free)
2300
sky130A