TQ2440 uboot---3.make EmbedSky_config

Although there are countless analyses on the Internet, I still feel it is necessary to analyze it myself.
Uboot usually requires two steps when compiling:
make EmbedSky_config
make all
1. Let's analyze what happens after executing make EmbedSky_config.
In the Makefile, there are the following

1. EmbedSky_config:unconfig

2. @$(MKCONFIG) $(@:_config=) arm arm920t EmbedSky NULL s3c24x0

1.1 unconfig:

1. @rm -f include/config.h include/config.mk \
   

2. 
   

3. board/*/config.tmp board/*/*/config.tmp

Unconfig is very simple. Delete a few files. The files deleted are generated in the following mkconfig
1.2 @$(MKCONFIG) $(@:_config=) arm arm920t EmbedSky NULL s3c24x0

1. MKCONFIG := $(SRCTREE)/mkconfig
   

2. 
   

3. export MKCONFIG
   

4. 
   

5. So $(MKCONFIG) is the mkconfig script in the current directory
   

6. 
   

7. $(@:_config=) remove the _config in EmbedSky_config,
   

8. 
   

9. EmbedSky_config:unconfig
   

10. 
    

11. ./mkconfig EmbedSky arm arm920t EmbedSky NULL s3c24x0
    

12. 
    

13. $0 $1 $2 $3 $4 $5 $6

1.3 Then let's analyze what happens after executing: ./mkconfig EmbedSky arm arm920t EmbedSky NULL s3c24x0

1. rm -f include/asm
   

2. 
   

3. ln -s include/asm-arm include/asm
   

4. 
   

5. 
   

6. rm -f asm-arm/proc
   

7. 
   

8. ln -s proc-armv asm-arm/proc
   

9. 
   

10. 
    

11. rm -f asm-arm/arch
    

12. 
    

13. ln -s arch-s3c24x0 asm-arm/arch

Write the following into include/config.mk
ARCH = arm
CPU = arm920t
BOARD = EmbedSky
SOC = s3c24x0
Write the following into include/config.h
#include

mkconfig does two main things: creates symbolic links and creates config.mk and config.h files.