Chao: /* Reference */

2020-05-12T15:25:00Z

Reference

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== Structure ==
* 上电 ——> Bootloader —[传递参数]—> 加载内核 ——> 内核挂载根文件系统 ——>执行应用程序
[[File:Starting linux.png|600px]]
* [[:category: bootloader]]
* [[:category: dtb]]
* [[:category: Kernel]]
* [[:category: Rootfs]]
=== Example SPI Flash Partition ===

* Zero V3S - https://licheezero.readthedocs.io/zh/latest/%E7%B3%BB%E7%BB%9F%E5%BC%80%E5%8F%91/SPI_flash_build.html

{| class="wikitable"
|-
! 分区序号 !! 分区大小 !! 分区作用 !! 地址空间及分区名
|-
| mtd0 || 1MB (0x100000) || spl+uboot || 0x0000000-0x0100000 : “uboot”
|-
| mtd1 || 64KB (0x10000) || dtb文件 || 0x0100000-0x0110000 : “dtb”
|-
| mtd2 || 4MB (0x400000) || linux内核 || 0x0110000-0x0510000 : “kernel”
|-
| mtd3 || 剩余 (0xAF0000) || 根文件系统 || 0x0510000-0x1000000 : “rootfs”
|}
Nano F1C100S - https://whycan.cn/t_2179.html
ID SIZE USAGE ADDR
0 448kb U-boot 0x0000 0000 - 0x0007 0000
1 64kb dtb 0x0007 0000 - 0x0008 0000
2 4mb kernel 0x0008 0000 - 0x0048 0000
3 7.5mb rootfs 0x0048 0000 - 0x00c0 0000
4 4mb overlay 0x00c0 0000 - 0x0100 0000

* Structure 2
* 0x0 u-boot
* 0x40000 dtb -> device tree
* 0x50000 kernel -> kernel
* 0x510000 rootfs -> root file system

== Pack Image Firmware ==
===二进制bin 打包 Zero V3S ===
以16M 大小flash镜像打包脚本为例：
dd if=/dev/zero of=flashimg.bin bs=1M count=16 &&\
dd if=$YOUR_UBOOT_FILE of=flashimg.bin bs=1K conv=notrunc &&\
dd if=$YOUR_DTB_FILE of=flashimg.bin bs=1K seek=1024 conv=notrunc &&\
dd if=$YOUR_KERNEL_FILE of=flashimg.bin bs=1K seek=1088 conv=notrunc &&\
mkdir rootfs
tar -xzvf $YOUR_ROOTFS_FILE -C ./rootfs &&\
cp -r $YOUR_MOD_FILE rootfs/lib/modules/ &&\
# 为根文件系统制作jffs2镜像包
# --pad参数指定 jffs2大小
# 由此计算得到 0x1000000(16M)-0x10000(64K)-0x100000(1M)-0x400000(4M)=0xAF0000
mkfs.jffs2 -s 0x100 -e 0x10000 --pad=0xAF0000 -d rootfs/ -o jffs2.img &&\
dd if=jffs2.img of=$YOUR_IMG_FILE bs=1K seek=5184 conv=notrunc &&\
以上脚本通过对一个生成的16M空bin文件填充 uboot、dtb、kernel、rootfs 生成 16M 镜像，如需修改，请注意各个文件的大小，修改成对应地址（注意对齐）。<br>
至此，SPI系统各部分已编译完成，通过sunxi-fel进行烧写即可；

== Debug - Segment Fault ==
=== Core Dump ===
* https://licheezero.readthedocs.io/zh/latest/%E5%BA%94%E7%94%A8/debug.html

== Toolchain Setup ==

=== Pre install ===
* sudo apt install build-essential checkinstall zlib1g-dev libssl-dev flex bison libncurses5-dev -y
Buildroot
* apt-get install linux-headers-$(uname -r)

=== Toolchain ===
* Install [[ARM GCC]]
Normal on PC
* gcc: gcc -o helloword helloword.c
Openwrt
* openwrt compiler: /openwrt/staging_dir/toolchain_mispel_...../bin/mispel-openwrt-linux-gcc -o helloword hellworld.c
* to fix error - environment error'STAGING_DIR'not defined, run - export STAGING_DIR=/openwrt/staging_dir/
* to set openwrt complier absoulte directory run - nano /etc/environment, add directory path after ":", run - source environment to make it work, finall command will be '''mispel-openwrt-linux-gcc'''

== Reference ==
* USB Gadget - https://linux-sunxi.org/USB_Gadget
* Reference - https://www.thirtythreeforty.net/posts/2019/12/my-business-card-runs-linux/
* Starting linux - https://www.cnblogs.com/schips/p/11393234.html
LPI

* https://licheezero.readthedocs.io/zh/latest/%E7%B3%BB%E7%BB%9F%E5%BC%80%E5%8F%91/bsp_index.html
Full process Zero V3S
* https://whycan.cn/t_3138.html

[[category: Linux]]

Category:Linux SDK - Revision history

Chao: /* Reference */