update README.md

README.md

@@ -3,14 +3,35 @@
 to build kernel easily.
 
 check this project at same level to the "./tmp_kernel_5.15/" will be nice.
+source folder and cross-compiler sets in 'package.config'
+
+## package.config
+
+```bash
+CROSS_COMPILE=/opt/gcc-arm-10.2-2020.11-x86_64-aarch64-none-linux-gnu/bin/aarch64-none-linux-gnu-
+FOLDER_NAME=build_none
+CONFIG_NAME=std_config
+CORES=8
+SRC=../tmp_kernel_5.15/
+
+RAM_ROOTFS=rootfs.tar.gz
+```
 
 # command
 
+- Makefile : Eeasily command shortcut.
+  - make: build new kernel and uimage, dts
+  - make c: build new kernel only
+  - make menu: open menuconfig
+  - make ubonly: use previous built kernel, and build new dts, uimage
+  - make deb: build new deb format kernel
+  - make ram: build new kernel, dts, uimage and initrd.img
+
 - build_kernel.sh : build kernel
-  - c: compile only
-  - debs: make debs packages
-  - menu: open menuconfig
-  - @noargs: make targz-pkg
+  - build_kernel.sh c: compile only
+  - build_kernel.sh debs: make debs packages
+  - build_kernel.sh menu: open menuconfig
+  - build_kernel.sh: just likke 'make targz-pkg'
 
 - build.sh : build boot.img
   - build.sh：build a kernel-only img file;  
@@ -19,10 +40,4 @@ check this project at same level to the "./tmp_kernel_5.15/" will be nice.
 
 - copy.sh : copy all img file to /tftpboot/
 
-- mkfirmware.sh : make firmware images in to tools/Image/
-
-- mkupdate.sh : build update.img
-
 - package.config : config how to pack your image
-
-- Makefile : Eeasily command shortcut.