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feat(nutshell): add rv64imac workload profiles - #76
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Keep `nutshell` as the 128 MiB uartlite / no-PLIC machine used by NEMU's riscv64-nutshell_defconfig and NutShell simulation, add `nutshell-mem2g` for the same map with 2 GiB of DRAM, and add `nutshell-fpga` for UART16550 + PLIC. All three names emit `riscv,isa = "rv64imac_zicsr_zifencei"` to match `riscv,isa-extensions`. NutShell implements Zicsr and Zifencei; it does not implement Zicntr or Zihpm. SPEC2006 still needs its own rv64imac/lp64 compiler cfg.
poemonsense
approved these changes
Sep 20, 2026
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Keep
nutshellas the 128 MiB uartlite / no-PLIC machine used by NEMU's riscv64-nutshell_defconfig and NutShell simulation, addnutshell-mem2gfor the same map with 2 GiB of DRAM, and addnutshell-fpgafor UART16550 + PLIC.All three names emit
riscv,isa = "rv64imac_zicsr_zifencei"to matchriscv,isa-extensions. NutShell implements Zicsr and Zifencei; it does not implement Zicntr or Zihpm.SPEC2006 still needs its own rv64imac/lp64 compiler cfg.