Porting Linux 2.6.39 to Micro2440 development board-EEWORLD

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All versions of Linux source code can be downloaded from https://github.com/torvalds/linux/. The Linux source code used in this document is linux-2.6.39 (Network Disk: http://pan.baidu.com/s/1dDxjNl3).

1. Unzip the source code

Unzip the source code to the working directory. Here we use the 7za command in the p7zip tool. Using the unzip command will prompt the error "File name too long".

# Enter the working directory

# 7za x /media/sf_ShareDIR/MICRO2440/source/linux-2.6.39.zip

# cd ./linux-2.6.39

2. Linux kernel compilation

In the kernel tree of Linux 2.6.39, the mini2440 development board is already supported. The micro2440 is an upgraded version of the mini2440, so many configurations are compatible. Therefore, the configuration of the mini2440 development board can be selected.

a) Modify Makefile (the red words are the modified or added parts)

#vim Makefile

ARCH ?= arm

CROSS_COMPILE ?= arm-linux-

b) Generate mini2440 development board configuration

# make mrproper

# make mini2440_defconfig

c) Compile the kernel

# make uImage

d) Download the kernel to RAM and run it through U-BOOT (NOR)

The kernel can be downloaded to RAM and run through the NOR U-BOOT made in the article "Transplanting U-BOOT-2.14.07 to MICRO2440 Development Board.doc".

# tftp 0x30008000 /MICRO2440/uImage

#bootm

To facilitate debugging, you can set the U-BOOT startup command to download the kernel boot through TFTP.

# setenv bootcmd 'tftp 0x30008000 /MICRO2440/uImage;bootm'

As shown in the figure above, the kernel can be started normally, but it is stuck at "Uncompressing Linux... done, booting the kernel." This is usually caused by not setting the startup parameters (console= is not set) or the machine code of U-BOOT and the kernel is inconsistent. After testing, after setting the startup parameters (bootargs) in U-BOOT, it can be started normally. There may be a BUG in 2.6.39. I did not set any machine code here, and all used the default. U-BOOT uses 193 (arch/arm/include/asm/mach-types.h) and LINUX uses 1999 (arch/arm/tools/mach-types). The machine code is inconsistent, but it can still be started. After testing, other versions of LINUX cannot be started. The machine code must be consistent to start.

Reference address：Porting Linux 2.6.39 to Micro2440 development board

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