refine Readme for demo

demo/Readme.md

@@ -0,0 +1,35 @@
+# Demo
+
+## helloworld
+
+This a demo for llvm build and sim with verilator.
+
+## jtag
+
+This is a demo of jtag simulation by openocd running on verilator.
+
+## install openocd
+
+```shell
+git clone https://github.com/riscv/riscv-openocd.git
+cd riscv-openocd
+./bootstrap
+./configure --prefix=$RISCV --enable-remote-bitbang --enable-jtag_vpi --enable-ftdi --enable-jlink
+make
+sudo make install
+```
+
+## build and install riscv tools
+
+* Opetion1 :https://github.com/riscv-collab/riscv-gnu-toolchain.git
+* Opetion2 :  
+
+```bash
+sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev libusb-1.0-0-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev device-tree-compiler pkg-config libexpat-dev libfl-dev
+git clone https://github.com/chipsalliance/rocket-tools.git
+git submodule update --init --recursive
+sudo su
+export RISCV=/opt/riscv
+export MAKEFLAGS="-j12"
+./build-rv32ima.sh
+```

demo/helloworld/Makefile

@@ -1,6 +1,6 @@
 export RV_ROOT = ${PWD}/../..
 LLVMINSTALL = /home/colin/develop/llvm-build/install
-GCC_PREFIX = /opt/riscv/bin/riscv64-unknown-elf
+GCC_PREFIX = /opt/riscv/bin/riscv32-unknown-elf
 
 DEMODIR = ${PWD}
 BUILD_DIR = ${DEMODIR}/build

demo/jtag/Readmd.md

@@ -0,0 +1,18 @@
+# jtag simulation
+
+
+## start openocd
+
+`openocd -d -f swerv.cfg`
+
+## start gdb
+
+`/opt/riscv/bin/riscv32-unknown-elf-gdb -ex "target extended-remote :3333"`
+
+## quick start
+
+At demo/jtag/  
+
+1. `make all`  
+2. `make openocd` 
+3. `make gdb`

demo/jtag/readmd.md

@@ -1,27 +0,0 @@
-# jtag simulation
-
-## install openocd
-
-```shell
-git clone https://github.com/riscv/riscv-openocd.git
-cd riscv-openocd
-./bootstrap
-./configure --prefix=$RISCV --enable-remote-bitbang --enable-jtag_vpi --enable-ftdi --enable-jlink
-make
-sudo make install
-```
-## start openocd
-
-`openocd -d -f swerv.cfg`
-
-## start gdb
-
-`/opt/riscv/bin/riscv32-unknown-elf-gdb -ex "target extended-remote :3333"`
-
-## quick start
-
-At demo/jtag/  
-
-1. `make all`  
-2. `make openocd` 
-3. `make gdb`