add initial README.md

README.md

@@ -0,0 +1,45 @@
+# Introduction
+
+This builds Linux with rv64ilp32 for trying on K230 devices.
+
+# Preparations
+
+Please prepare toolchain, source tree and host packages before building.
+
+## Toolchain preparation
+
+Please get the [rv64ilp32 toolchain](https://github.com/ruyisdk/riscv-gnu-toolchain-rv64ilp32) and install on build host.
+
+Please setup environment variable `RV64ILP32_TOOLCHAIN_HOME` as the toolchain root path:
+
+```
+$ export RV64ILP32_TOOLCHAIN_HOME=<toolchain-install-root>
+$ ls -F $RV64ILP32_TOOLCHAIN_HOME
+riscv/
+```
+
+Please note that a `riscv64-unknown-linux-gnu-` toolchain is needed to build the uboot submodule.
+
+## Source tree preparation
+
+Before building, please run the following commands to fetch the submodule sources:
+
+```
+$ git submodule update --init --recursive
+```
+
+## Host packages
+
+You may need the following host packages on Ubuntu:
+
+```
+$ sudo apt install libssl-dev
+```
+
+# Build
+
+Run `build.sh` in top folder to see how to build different targets.
+
+The final image will be available in `output/` folder, which can be used on K230devices.
+
+

build.sh

@@ -142,7 +142,6 @@ function fault() {
 }
 
 function main() {
-  echo $#
   if [[ $# < 1 ]]; then
     fault
   fi