[TINY4412移植篇]linux-5.5

一)环境

a)ubuntu18.04

b)arm-linux-gnueabi-gcc 7.5.0 / gcc 7.5.0

c)FriendlyArm tiny4412 标准版

二)目标

a)上电从SD卡启动u-boot

b)u-boot从SD卡启动linux

c)linux从SD卡加载根文件系统

d)使用当前最新版u-boot-2020.01.tar.bz2;下载地址:ftp://ftp.denx.de/pub/u-boot/

e)使用当前最新版busybox-1.31.1.tar.bz2,下载地址:https://busybox.net/downloads/

f)使用当前最新版linux-5.5.tar.xz,下载地址:https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/

三)步骤

a)Makefile

1)ARCH = arm

2)CROSS_COMPILE = arm-linux-gnueabi-

b)tiny4412_defconfig

1)cp arch/arm/configs/exynos_defconfig arch/arm/configs/tiny4412_defconfig

2)cp arch/arm/configs/tiny4412_defconfig .config

c)make menuconfig

1)[Kernel hacking]->[arm Debugging]->[Kernel low-level debugging functions]

2)[Kernel hacking]->[arm Debugging]->[Enable decompressor debugging via DEBUG_LL output]

3)[Kernel hacking]->[arm Debugging]->[Early printk]

d)make uImage LOADADDR=0x40007000 -j12

e)exynos4412-tiny4412.dts

1)add line "bootargs = "root=/dev/ram0 rw rootfstype=ext4 console=ttySAC0,115200 init=/linuxrc earlyprintk";" in chosen node

f)make dtbs

g)cp arch/arm/boot/uImage to SD

h)cp arch/arm/boot/dts/exynos4412-tiny4412.dtb to SD

 

结束语:

1)u-boot.bin, ramdisk.img,uImage,exynos4412-tiny4412.dtb已经准备完毕;

2)通过三星提供的工具烧录u-boot.bin到SD卡;

3)拷贝ramdisk.img,uImage,exynos4412-tiny4412.dtb到SD卡根目录;

4)TINY4412从SD卡启动;

5)串口0打印uboot和kernel信息,整个移植过程完成,下一步开始驱动篇.