Chapter 14: TIny4412 U-BOOT Transplantation 14 Compile and Generate Kernel

1. Modified file description

Because there are many modifications in each file in the previous chapters, it takes too much time to record them one by one, so I have talked about a lot of principles. Here I will summarize the files I have modified. The modified files mentioned here are relative to the u-boot platform code created in the first chapter.

1. /makefile

2. The entire sd_fuse folder. I copied the entire sd_fuse folder under the uboot provided by FriendlyARM. Because this file is used to burn the SD card, I copied it directly and used it.

3. /include/configs/zthtiny4412.h

4. /board/Samsung/zthtiny4412

5. /arch/arm/lib/board.c

6. /arch/arm/include/asm/arch-exynos/cpu.h

7. / arch/arm/include/asm/arch-exynos/movi_partition.h

8. / arch/arm/cpu/armv7/exynos/irom_copy.c Actually, this file does not need to be modified. I changed it for debugging.

These should be the files. Now we can compile the kernel.

2. Compile, burn and debug

The following commands are provided for reference:

cp -R /media/sf_share/u-boot_zth .

chmod –R 777 u-boot_zth /

cd u-boot_zth

make distclean

make zthtiny4412_config

make

The following is the SD card file provided by FriendlyARM.

cd sd_fuse/

make

cd zthtiny4412/

./sd_fusing.sh /dev/sdb

The serial port information after running is shown in the figure below:

Figure 14-1, u-boot debugging output information

To be honest, I didn't expect uboot to be able to run to the step of entering commands, and the output information can be said to be basically the same as that provided by FriendlyArm, except for the two places I marked above, the differences in other places were deliberately added when I modified the code.

To be honest, I feel surprised and happy at this point, but also a bit frustrated, because I didn't expect it to go this far at once. I thought I would have to change this and that to support the network, commands, etc. I didn't expect it to get to this point at once, so I had to change my plan. I don't have the courage and energy to get a source code from the UBOOT official website to port it, because I killed this idea at the beginning. I was still impatient, and my goals were different. I didn't have much time, so I always wanted to do it quickly. I don't want to do it again, so let's just leave it at that. The next step is to port the LCD.

One more point needs to be explained. I tried to find the reasons for the above two differences by comparing them with the codes provided by FrienlyARM. I didn't compare them in detail, so I didn't find the specific reasons and I'm still unsure.