Update 0629.md

add os courses

software/2020/0629.md

@@ -76,7 +76,10 @@ As Dropbox Transfer adoption grows and the product expands and evolves, it remai
 
 **Learning operating system development using Linux kernel and Raspberry Pi**  
 https://s-matyukevich.github.io/raspberry-pi-os/  
-This repository contains a step-by-step guide that teaches how to create a simple operating system (OS) kernel from scratch. I call this OS Raspberry Pi OS or just RPi OS. The RPi OS source code is largely based on Linux kernel, but the OS has very limited functionality and supports only Raspberry PI 3. Each lesson is designed in such a way that it first explains how some kernel feature is implemented in the RPi OS, and then it tries to demonstrate how the same functionality works in the Linux kernel.
+https://github.com/s-matyukevich/raspberry-pi-os  
+This repository contains a step-by-step guide that teaches how to create a simple operating system (OS) kernel from scratch. I call this OS Raspberry Pi OS or just RPi OS. The RPi OS source code is largely based on Linux kernel, but the OS has very limited functionality and supports only Raspberry PI 3. Each lesson is designed in such a way that it first explains how some kernel feature is implemented in the RPi OS, and then it tries to demonstrate how the same functionality works in the Linux kernel. 另附：
+-  [Stanford - CS-3210, Documentation](https://tc.gts3.org/cs3210/2020/spring/info.html), CS-3210 is primarily intended for senior students (motivated junior students) and graduate students who want to concentrate on systems.  
+- [CS140E: embedded operating systems course materials](https://github.com/dddrrreee/cs140e-20win), 
 
 **The Google ‘vs’ Trick**  
 https://medium.com/applied-data-science/the-google-vs-trick-618c8fd5359f