20221101

1. Linux 系統下 安裝 QEMU(模擬器)
2. 開啟虛擬硬碟 Virtualbox安裝 crosstool-NG (p. 021))
   sudo apt-get install automake bison chrpath flex g++ git gperf gawk libexpat1-dev libncurses5-dev libsdl1.2-dev libtool python2.7-dev texinfo
   ps. [ERROR] E: Invalid operation python2.7-dev
3. ./confiure –enable-local
   ps. enable local 讓程式安裝在目前的資料夾
   => Configure: error: missing required tool: makeinfo => install texinfo
   => Configure: error: missing required tool: help2man => install help2man
   => configure: error: Required tool not found: GNU bash >= 3.1
   check GNU bash version: bash –version
   SOLUTION. picture.a, picture.b
   config build finished and makefile showup (picture.c, picture.d)
4. make
5. make install
   => showup ct-ng
6. check default setting (picture.e)
   ./ct-ng show-arm-cortex_a8-linux-gnueabi
7. Use this setting for target environment (picture.f)
   ./ct-ng arm-cortex_a8-linux-gnueabi
8. Use user interface for config menu command: menuconfig (picture.g)
   ./ct-ng menuconfig
9. The motification setting on menuconfig will save into .config file (picture.h)

1. https://iter01.com/198141.html
2. Embedded linux:
   1. toolchain:
   a. 使用crosstool-NG 組建
   b.
   crosstool-NG source code: https://github.com/jcmvbkbc/crosstool-NG