Merge new features from OS2019 projects

[Runji Wang]

OS2019 projects

• wiki: 2019年操作系统课程设计：教学操作系统rcore+的改进和扩展
• upstream branch: rCore/dev & rcore_plus/dev

GBA

• authors: @PanQL @xy-plus
• wiki: 简易版 rcore 开发与教学文档编写 && rcore plus 开发
• branch: rcore_plus/mgba
• platform: x86_64
• last merge to dev: 8e5e798 2019.06.03
• PRs: (null)
• status: ✅

MIPS

• authors: @Harry-Chen @miskcoo
• wiki: 第三届全国大学生系统能力培养大赛
• branch: rcore_plus/mipsel
• platform: mipsel
• last merge to dev: f410aef 2019.05.24
• PRs: rCore#8
• status: ✅

Router

• authors: @jiegec @Jackey-Huo
• wiki: FPGA 上运行 RISC-V rCore 构建路由器
• branch: rCore/dev
• platform: riscv64
• last merge to dev: realtime
• PRs: (null)
• status: ✅

LKM

• authors: @gjz010
• wiki: rCore 内核可加载模块和动态链接库
• branch: gjz010/rcore_plus/biscuit
• platform: x86_64, aarch64
• last merge to dev: 6aded70 2019.06.13
• PRs: #48 #57 #58 #59 #60
• status: 🚧

Audio on Raspi3

• authors: @gaotianyu1350 @Bakser
• wiki: Audio support for rCore
• branch: gaotianyu1350/rCore_audio/dev
• platform: aarch64
• last merge to dev: (null)
• PRs: rcore-fs#5 bcm2837#1
• status: ❓

SD driver on Raspi3

• authors: @NagiNikaido @BenjaminPMLovegood
• wiki: Python (and more) on rCore on RPi
• branch: GeminiLab/rCore/geminilab
  
• platform: aarch64
• last merge to dev: fa7e389 2019.06.03
• PRs: (null)
• status: ❓

[Chen]

SD driver on Raspi3 seems good to go. Maybe @NagiNikaido @BenjaminPMLovegood can do some code cleanup? e.g. change these test outputs:

Re-fetched content:
DE AD BE EF DE AD BE EF DE AD BE EF DE AD BE EF

Already merged their bcm2837 into upstream.

Update: I made the merge manually.

[Chen]

bcm2837 changes from rcore-os/bcm2837#1 still need some work. Kernel part is easier to merge IMO: https://github.com/rcore-os/rCore/compare/dev...gaotianyu1350:dev?expand=1

[Shengqi Chen]

MIPS part is fully merged to dev branch.