Bump nemu ref in ready-to-run (#114)

NEMU commit:d7f606977161a50dc03857976916e2576b3bf9ea

  * riscv64-xs-ref_defconfig
  * riscv64-dual-xs-ref_defconfig
  * riscv64-xs-ref-debug_defconfig
  * riscv64-dual-xs-ref-debug_defconfig
  * riscv64-xs-ref_bitmap_defconfig

Including: * refactor(priv): split priv_instr() into several functions * refactor(fence.i): set flush flag directly * refactor(mop): simplify the decode and exec helper * refactor(priv): totally abandon rtl_sys_slow_path * fix(Smstateen): add missing Smstateen permission checks * feat(Smcsrind): implement Smcsrind extension and enable it.

XiangShan ready-to-run binaries

This repo includes some prebuilt workloads and difftest reference libaries. Please refer to XiangShan-doc to learn how to use them.

This repo may be abandoned in feature, as we are trying to provide prebuilt binaries through Github release.

Prebuilt difftest reference libaries

riscv64-nemu-interpreter-so
- NEMU difftest reference library
- Built via the ci of OpenXiangShan/NEMU.
riscv64-nemu-interpreter-dual-so
- NEMU difftest reference library with dual core difftest support.
riscv64-spike-so
- SPIKE difftest reference library
- Built via the ci of OpenXiangShan/riscv-isa-sim.

Prebuilt workloads

linux.bin
- Simple Linux boot-up test.
- OpenSBI v1.4 + Linux 6.1.83 + print Hello
- ~~Built accodring to XiangShan-doc~~
  - The document has not updated for OpenSBI yet.
microbench.bin
- Baremental test-scale microbench workload
- Built via the ci of OpenXiangShan/nexus-am, application is apps/microbench
coremark-2-iteration.bin
- Baremental 2-iteration Coremark workload
- Built via the ci of OpenXiangShan/nexus-am, application is apps/coremark
copy_and_run.bin
- Copy 1-iteration coremark from flash to memory, and run it.
- Built via the ci of OpenXiangShan/nexus-am, application is apps/loader
flash_recursion_test.bin