【老师提案】Embedded Linux 系统 for RISC-V

调研开源社区中基于 Linux 的嵌入式 Linux 系统，把下载、构建、运行等流程在 RISC-V QEMU 或真实开发板上走一遍。

Busybox
Buildroot
Yocto：已完成2篇文章的编写

使用 meta-riscv 编译：https://gitee.com/tinylab/riscv-linux/blob/master/articles/20220930-riscv-bitbake-oe-yocto-1-qemu.md
使用 bitbake 编译 D1-H 哪吒开发板的官方 BSP：https://gitee.com/tinylab/riscv-linux/blob/master/articles/20221015-riscv-bitbake-oe-yocto-2-d1-nezha.md
使用 yocto/poky 编译 D1-H 哪吒开发板的 mainline BSP
D1-H 哪吒开发板不同 BSP 启动方式分析。

其他

参考：

meta-riscv: https://github.com/riscv/meta-riscv
meta-raios: https://gitee.com/riscv-raios

昨天说的 Ubuntu 适配 D1 的问题，看了这个链接的评论应该是内存不足，现在手里的板子是512M的内存，官方应该适配的是2G内存的板子。

initd
1
27d

I made Nezha img boot on my LicheeRV Dock after remove cryptsetup-initramfs

First of all, write the img to a microSD card
the following steps:

    A Ubuntu Linux host (Live CD should be OK)
    1.install qemu-user-static
    2.mount VFS by using https://github.com/initdc/rootfs-tools/blob/master/mount.rb 
    3.chroot /media/ubuntu/cloudimg-rootfs
    4.apt remove cryptsetup-initramfs
    5.Cause LicheeRV Dock doesn’t have a Eth port, you may need install net-tools network-manager to connnect Wi-Fi if wireless card working well. A USB to Eth Connector will work well if you have one.
    6.umount VFS, eject card.
    7.After boot up, you can login with ubuntu/ubuntu, then you NEED set new password.
    A good UART client will makes you feel smooth. try MobaXterm
    try first RISC-V program from https://github.com/initdc/golang-project-workflow/releases/download/v0.0.1/demo-v0.0.1-linux-riscv64 1

I think dual-core CPU is the key to avoid stuttering, Is there any way to make it run faster for now?

我按照以上这一层楼评论的解决方案试了，总算是能到启动内核那里了，但是又报了个 Initramfs 的错误。
以上方案的 2.mount VFS by using https://github.com/initdc/rootfs-tools/blob/master/mount.rb 我没有看懂具体怎么对已结烧录过img的SD卡操作，且读卡器插卡到电脑上后，直接就有/media/ubuntu/cloudimg-rootfs，所以略过了步骤2。不知是不是因为略过步骤2的影响还是别的原因，感觉上还是内存不够的问题。

[    8.703688] Initramfs unpacking failed: write error                                   
[    9.335359] Failed to execute /init (error -2)                                        
[    9.341189] Kernel panic - not syncing: No working init found.  Try passing init= opt.
[    9.355364] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.17.0-1003-allwinner #3-Ubuntu 
[    9.363198] Hardware name: Allwinner D1 Nezha (DT)                                    
[    9.367990] Call Trace:                                                               
[    9.370445] [<ffffffff80005d50>] dump_backtrace+0x30/0x38                             
[    9.375866] [<ffffffff80b071d4>] show_stack+0x40/0x4c                                 
[    9.380934] [<ffffffff80b0f690>] dump_stack_lvl+0x44/0x5c                             
[    9.386344] [<ffffffff80b0f6c0>] dump_stack+0x18/0x20                                 
[    9.391405] [<ffffffff80b07628>] panic+0x104/0x2f6                                    
[    9.396206] [<ffffffff80b1b47e>] _cpu_down+0x0/0x3fa                                  
[    9.401183] [<ffffffff80003b94>] ret_from_exception+0x0/0xc                           
[    9.406778] ---[ end Kernel panic - not syncing: No working init found.  Try passing -

上述问题已解决，会写个 512M 的 D1 开发板跑官方 Ubuntu 镜像的步骤。

应该是不够的问题。

@walimis 已经提交了用 yocto 制作 D1 镜像并烧录的方法，欢迎移步查阅：20221015-riscv-bitbake-oe-yocto-2.md

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【老师提案】Embedded Linux 系统 for RISC-V

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