Category:Linux SDK

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  • 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

Starting linux.png

Example SPI Flash Partition

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 -

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)。

Debug - Segment Fault

Core Dump

Toolchain Setup

Pre install

  • sudo apt install build-essential checkinstall zlib1g-dev libssl-dev flex bison libncurses5-dev -y


  • apt-get install linux-headers-$(uname -r)


Normal on PC

  • gcc: gcc -o helloword helloword.c


  • 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



Full process Zero V3S


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Pages in category "Linux SDK"

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