[doc] Update README.md

Makefile

@@ -2,7 +2,7 @@ AX_ROOT ?= $(PWD)/.arceos
 AX_TESTCASE ?= nimbos
 ARCH ?= x86_64
 AX_TESTCASES_LIST=$(shell cat ./apps/$(AX_TESTCASE)/testcase_list | tr '\n' ',')
-
+FEATURES ?= fp_simd
 RUSTDOCFLAGS := -Z unstable-options --enable-index-page -D rustdoc::broken_intra_doc_links -D missing-docs
 
 ifneq ($(filter $(MAKECMDGOALS),doc_check_missing),) # make doc_check_missing
@@ -23,7 +23,7 @@ test:
 	@./scripts/app_test.sh
 
 build run justrun debug disasm: ax_root
-	@make -C $(AX_ROOT) A=$(PWD) $@
+	@make -C $(AX_ROOT) A=$(PWD) FEATURES=$(FEATURES) $@
 
 clean: ax_root
 	@make -C $(AX_ROOT) A=$(PWD) clean

README.md

@@ -5,16 +5,82 @@
 A monolithic kernel based on [ArceOS](https://github.com/arceos-org/arceos).
 
 ## Quick Start
-```sh
+
+### 1. Install Build Dependencies
+
+Install [cargo-binutils](https://github.com/rust-embedded/cargo-binutils) to use `rust-objcopy` and `rust-objdump` tools:
+
+```bash
+cargo install cargo-binutils
+```
+
+#### Dependencies for C apps
+
+Install `libclang-dev`:
+
+```bash
+sudo apt install libclang-dev
+```
+
+Download & install [musl](https://musl.cc) toolchains:
+
+```bash
+# download
+wget https://musl.cc/aarch64-linux-musl-cross.tgz
+wget https://musl.cc/riscv64-linux-musl-cross.tgz
+wget https://musl.cc/x86_64-linux-musl-cross.tgz
+# install
+tar zxf aarch64-linux-musl-cross.tgz
+tar zxf riscv64-linux-musl-cross.tgz
+tar zxf x86_64-linux-musl-cross.tgz
+# exec below command in bash OR add below info in ~/.bashrc
+export PATH=`pwd`/x86_64-linux-musl-cross/bin:`pwd`/aarch64-linux-musl-cross/bin:`pwd`/riscv64-linux-musl-cross/bin:$PATH
+```
+
+#### Dependencies for running apps
+
+```bash
+# for Debian/Ubuntu
+sudo apt-get install qemu-system
+```
+
+```bash
+# for macos
+brew install qemu
+```
+
+Notice: The version of `qemu` should **be no less than 8.2.0**.
+
+Other systems, arch and version please refer to [Qemu Download](https://www.qemu.org/download/#linux)
+
+### 2. Build & Run
+
+```bash
 # Clone the base repository
 ./scripts/get_deps.sh
 
 # Build user applications
-make user_apps
+make user_apps ARCH=<arch> AX_TESTCASE=<testcases>
 
 # Build kernel
-make ARCH=x86_64 build
+make ARCH=<arch> LOG=<log> AX_TESTCASE=<testcases> build
 
 # Run kernel
-make ARCH=x86_64 run
-```
+make ARCH=<arch> LOG=<log> AX_TESTCASE=<testcases> run
+```
+
+Where `testcases` are shown under the `apps/` folder.
+
+`<arch>` should be one of `riscv64`, `aarch64`, `x86_64`.
+
+`<log>` should be one of `off`, `error`, `warn`, `info`, `debug`, `trace`.
+
+More arguments and targets can be found in [Makefile](./Makefile).
+
+For example, to run the [nimbos testcases](apps/nimbos/) on `qemu-system-x86_64` with log level `info`:
+
+```bash
+make ARCH=x86_64 LOG=info AX_TESTCASE=nimbos run
+```
+
+Note: Arguments like `NET`, `BLK`, and `GRAPHIC` enable devices in QEMU, which take effect only at runtime, not at build time.