Cleanup unused files

Author: vacantron

.clang-format

@@ -1,46 +1,5 @@
-# The test suite for [rv32emu project](https://github.com/sysprog21/rv32emu)
+# The prebuilt binaries for [rv32emu](https://github.com/sysprog21/rv32emu)
 
-## Prerequisites
-
-This test suite relies RISC-V GNU toolchain to build the ELF files. See the [prerequisites section](https://github.com/riscv-collab/riscv-gnu-toolchain?tab=readme-ov-file#prerequisites) of RISC-V GNU toolchain.
-
-## Build ELFs
-
-Run `make` to build the binaries.
-The default enabled extensions of RISC-V are `rv32gc` (a.k.a. rv32imafdc) and the optimization levels are `O0, O1, O2`.
-These two options can be overrided by the argument `RV32_EXT` and `OPT_LEVEL`.
-
-```shell
-$ make [RV32_EXT=<rv32_ext>] [OPT_LEVEL=<opt_level>]
-```
-
-The `RV32_EXT` takes the same value that passing to `--with-arch` of the RISC-V GNU toolchain, and the `OPT_LEVEL` takes the combination of the whitespace separated number of 0, 1, 2 and quoted with the (double) quotation marks.
-
-e.g.
-
-```shell
-$ make RV32_EXT=rv32im OPT_LEVEL="0 2"
-```
-
-Notice that the above command will build the corresponding toolchain first if it doesn't exist and might take a few time.
-You can set the `--jobs (-j)` option to enable the parallel build.
-
----
-
-The built binaries will be placed in the corresponding subdirectories under the `build` directory.
-
-```
-rv32emu-prebuilt/
-+-- build/
-|   +-- <RV32_EXT>/
-|       +-- O0/
-|       |   ...
-|       |
-|       +-- O1/
-|       |   ...
-|       |
-|       +-- O2/
-|       |   ...
-|
-+-- ...
-```
+- testbenches (x86-softfp / aarch64)
+- [RISC-V Sail model](https://github.com/riscv/sail-riscv)
+- Linux Kerenl image