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carloscn/NXP IMX6 嵌入式板子一些笔记.md

Created September 17, 2022 00:43
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NXP IMX6 嵌入式板子一些笔记
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NXP IMX6 嵌入式板子一些笔记.md

Set device a fix MAC address on Linux layer.

vi /etc/init.d/networking

on start handler.

start)
        echo -n "Configuring network interfaces... "
        sysctl -e -p /etc/sysctl.conf >/dev/null 2>&1
        #========set fix mac address by Carlos
        echo "[USER]/etc/init.d/networking: start to change the fix mac address for device."
        ifconfig eth0 down                           
        echo "[USER]/etc/init.d/networking: config the mac address to 5A:A1:6A:97:F3:C8."   
        ifconfig eth0 hw ether 5A:A1:6A:97:F3:C8
        echo "[USER]/etc/init.d/networking: link up."
        ifconfig eth0 up
        echo ""
        #========set by Carlos finish
        ifup -a
        echo "done."
        ;;
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note: The original README has been changed to README.old

Compiling the Linux Kernel for IMX6

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- imx_v7_defconfig

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig (optional)

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- all -j16

  • The compiled output zImage is saved on arch/arm/boot
  • The compiled .dtb files are saved on the arch/arm/boot/dts

Starting compiled dirty Linux Kernel

config nfs on your host

installing nfs-kernel-server on your host

sudo apt-get install nfs-kernel-server rpcbind

config exports on your host

sudo vim /etc/exports

and you need to add the NFS sharing path on the exports:
/home/carlos/nfs *(rw,sync,no_root_squash)

changing the version of nfs-kernel-server

Note, the nfs version of ubuntu 20.04 is too high to transform file for uboot.
So we need to modify the version config manually by

sudo vim /etc/default/nfs-kernel-server

changing the version RPCNFSDCOUNT="-V 2 8"

restarting the nfs

sudo /etc/init.d/nfs-kernel-server restart

copy the zImage to the nfs

cp -r arch/arm/boot/zImage /home/carlos/nfs

cp -r arch/arm/boot/dts/imx6ull-14x14-evk.dtb /home/carlos/nfs

some operations on your device uboot console

Ensure that the uboot args is console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw

dhcp

nfs 80800000 192.168.31.2:/home/carlos/nfs/zImage

nfs 83000000 192.168.31.2:/home/carlos/nfs/imx6ull-14x14-evk.dtb

bootz 80800000 - 83000000

replacing new kernel zImage on EMMC

  • Transfer the zImage from host to device by scp -r arch/arm/boot/zImage root@192.168.31.210:/run/media/mmcblk1p1/zImage

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IMX6ULL快速使用笔记

uboot

代码

git clone git@github.com:carloscn/imx-uboot.git

编译

使用compile.sh编译

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mx6ull_14x14_ddr512_emmc_defconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- all -j16

下载

方法一：imdown.elf

使用imdown.elf工具下载到sd卡，在代码仓库中已经集成，burn_tools。方法就是插上SD卡，使用命令sudo ./imxdown.elf u-boot.bin /dev/sdd 后面的/dev/sdd使用 df -l来查看是不是自己的内存卡。

方法二：uboot sd或emmc命令

uboot 支持 EMMC 和 SD 卡，因此也要提供 EMMC 和 SD 卡的操作命令。一般认为 EMMC和 SD 卡是同一个东西，所以没有特殊说明，本教程统一使用 MMC 来代指EMMC 和 SD 卡。uboot 中常用于操作 MMC 设备的命令为“mmc”。

如果当前uboot没有损坏，我们可以使用uboot来更新uboot。编译好的uboot放在nfs或者tftp文件夹里面。使用tftp把数据加载到ram中。

tftp 80800000 u-boot.imx

一共是384000字节，（384000/512 = 750个块 = 0x2ee个块）

再由ram加载到sd卡：

mmc list ：查看emmc列表
mmc dev 0 0：选中sd卡0的第0个分区
mmc write 80800000 2 2ee 从ram的80800000起始地址的写 0分区第2个块 长度 2ee

note:

  • 如果是烧写mmc，还需要mmc partconf 1 1 0 0 //分区配置，EMMC 需要这一步
  • 千万不要烧写SD卡或者EMMC的前两个块，里面保存着分区表。

配置uboot环境

EMMC 启动：setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw

网络启动：setenv bootargs 'console=ttymxc0,115200 root=/dev/nfs nfsroot=192.168.137.18:/home/pjw/linux/nfs/rootfs,proto=tcp rw ip=192.168.137.20:192.168.137.18:192.168.1.1:255.255.255.0::eth0:off'

在boot环境烧写zImage到emmc或sd卡

fatinfo mmc 1:1
fatls mmc 1:1
fatload mmc 1:1 80800000 zImage 把emmc里面的zimage加载到RAM
tftp 80800000 zImage 把zImage数据加载到RAM
fatwrite mmc 1:1 80800000 zImage 0x5c2720 把ram里面数据保存在emmc分区，命名为zimage 然后可以使用fatls查看。

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carloscn commented Mar 24, 2023 •
edited
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steps

setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw

fatload mmc 0:1 80800000 zImage

fatload mmc 0:1 83000000 imx6ull-14x14-evk.dtb

bootz 0x80800000 - 0x83000000

env

setenv bootargs_mmc 'setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw'
setenv bootcmd_mmc 'run bootargs_mmc; fatload mmc 0:1 80800000 zImage; fatload mmc 0:1 83000000 imx6ull-14x14-evk.dtb;bootz 0x80800000 - 0x83000000'
setenv bootcmd 'run bootcmd_mmc'
saveenv

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