0K6410 learning make_smdk6410_config

1. Use the board-level configuration command: make smdk6410_config, and find it in makefile under the root directory

########################################################################### ARM1176 Systems#########################################################################smdk6410_noUSB_config    \smdk6410_config   :   unconfig    @mkdir-p $(obj)include $(obj)board/samsung/smdk6410    @mkdir-p $(obj)nand_spl/board/samsung/smdk6410    @echo"#define CONFIG_NAND_U_BOOT" > $(obj)include/config.h    @if[ -z "$(findstring smdk6410_noUSB_config,$@)" ]; then          \       echo"RAM_TEXT = 0x57e00000" >>$(obj)board/samsung/smdk6410/config.tmp;\       $(MKCONFIG)$(@:_config=) arm arm1176 smdk6410 samsung s3c64xx;       \    else                                   \       echo"RAM_TEXT = 0xc7e00000" >>$(obj)board/samsung/smdk6410/config.tmp;\       $(MKCONFIG)$(@:_noUSB_config=) arm arm1176 smdk6410 samsung s3c64xx; \    fi    @echo"CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk########################################################################### ARM1176 Systems#########################################################################

1. Normally, make will output the command line to be executed to the screen before the command is executed. When we use the "@" character before the command line, this command will not be displayed by make.

2. @ mkdir-p $ (obj) include $ (obj) board/samsung/smdk6410 create a directory $ (obj) =/. If a directory exists, no directory is created.

3. @ mkdir-p $ (obj) nand_spl/board/samsung/smdk6410 similarly

4. @ echo "# define CONFIG_NAND_U_BOOT"> $ (obj) include/config. h

> Create a config. h file and add # define CONFIG_NAND_U_BOOT to it.

> Adds content to a file.

5. "$ (findstringsmdk6410_noUSB_config, $ @)" <==> "tips:

$ (Findstring FIND, IN)

Function Name: Find the string function-findstring.

Function: Search for the string "IN" and FIND the string "FIND.

Return Value: If "FIND" exists IN "IN", "FIND" is returned; otherwise, null is returned.

Function Description: the string "IN" can contain spaces and [Tab]. Search requires strict text matching.

Example:

$ (Findstring a, a B c)

$ (Findstring a, B c)

The first function returns the word "a", and the second value is a null character.

6. if [-z "$ (findstring smdk6410_noUSB_config, $ @)"]-z should indicate the inverse meaning, that is, the sentence following the non-null execution

Echo "RAM_TEXT = 0x57e00000" >$ (obj) board/samsung/smdk6410/config. tmp ;\

$ (MKCONFIG) $ (@: _ config =) arm arm1176 smdk6410 samsung cloud64xx ;\

First, recover RAM_TEXT = 0x57e00000 to config. tmp, and then execute $ (MKCONFIG) $ (@: _ config =) arm
Arm1176 smdk6410 samsunginiti64xx;

7. $ (MKCONFIG) $ (@: _ config =) arm arm1176 smdk6410 samsung cloud64xx;

MKCONFIG: = $ (SRCTREE)/mkconfig <====> MKCONFIG = mkconfig,

$ (@: _ Config =) means replacing _ config with spaces, while $ (@: _ config) <==> smdk6410:

$ (@ D)

Indicates the directory part of the target file (excluding the slash ). If "$ @" is "dir/foo. o", then "$ (@ D )"

The value is "dir ". If "$ @" does not contain a slash, its value is "." (current directory ).

8. @ echo "CONFIG_NAND_U_BOOT = y"> $ (obj) include/config. mk is also an append information.

2. We know that executing make smdk6410_config is equivalent to executing

Mkconfig smdk6410 arm arm1176 smdk6410 samsung cloud64xx

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

Then run the script file mkconfig in the root directory to see that there is such a piece of code first.

1、while[ $# -gt0 ] ; do      case"$1" in    --)shift ; break ;;    -a)shift ; APPEND=yes ;;    -n)shift ; BOARD_NAME="${1%%_config}" ; shift ;;    -t)shift ; TARGETS="`echo $1 | sed 's:_: :g'` ${TARGETS}" ; shift ;;    *)  break ;;    esacdone

While [$ #-gt 0] means to execute the following when the number of input parameters is greater than 0.

These lines of code are used to determine whether the first parameter $1 has the following four cases: case. Add minor knowledge

2. ["$ {BOARD_NAME}"] | BOARD_NAME = "$1" indicates that if no board name is defined, the Board name is assigned $1. Obviously, no board name is defined here.

3. [$ #-lt 4] & exit 1
# Determine the number of input parameters. Exit if the value is smaller than 4,

[$ #-Gt 6] & exit 1
# Exit if it is greater than 6

4. if ["$ {ARCH}"-a "$ {ARCH }"! = "$2"]; then

Echo "Failed: \ $ ARCH =$ {ARCH}, shocould be '$ 2' for $ {BOARD_NAME}" 1> & 2

Exit1

If ARCH has been defined and is defined as arm, the following information will be printed. Obviously, the condition is not true and skipped.

5. echo "tracing ing for $ {BOARD_NAME} board..." # print the information. Please try make smdk6410_config.

6. # Create link to architecture specific headers

If ["$ SRCTREE "! = "$ OBJTREE"]; then mkdir-p $ {OBJTREE}/include mkdir-p ${OBJTREE}/include2 cd ${OBJTREE}/include2 rm-f asm ln-s $ {SRCTREE}/include/ asm-$2 asm LNPREFIX = ".. /.. /include2/asm/"cd .. /include rm-rf asm-$2 rm-f asm mkdirasm-$2 ln-s asm-$2 asmelse # apparently the condition is not true and the cd is transferred here. /include rm-f asm ln-s asm-$2 asmfi

Check the makefile source code and you will know the content after executing else because SRCTREE = OBJTREE.

Cd./include

Rm-f asm

Ln-s asm-$2 asm

Ln-s asm-$2 asm indicates creating an asm temporary file pointing to the asm-arm architecture. For example,

The include directory contains many folders starting with asm. After executing this command, we will point to the unique asm-arm.

7. if [-z "$6"-o "$6" = "NULL"]; then

Ln-s $ {LNPREFIX} arch-$3 asm-$2/arch

Else

Ln-s $ {LNPREFIX} arch-$6 asm-$2/arch # create a link file

Fi

If the sixth parameter is null, then is executed. Otherwise, else is executed. It is obviously not empty. A link file is also created, and LNPREFIX is not defined as null.

Currently, the-z (shell not learned) That is summed up by myself indicates the reverse;-o or operation;-a and operation. I don't know, right? Wait until you have a network!

8. if ["$2" = "arm"]; then

Rm-f asm-$2/proc

Ln-s $ {LNPREFIX} proc-armv asm-$2/proc

Fi

I will not repeat the above.

9 ,#

# Create include file for Makeecho "ARCH   = $2" >  config.mkecho "CPU    = $3" >> config.mkecho "BOARD  = $4" >> config.mk[ "$5" ] && ["$5" != "NULL" ] && echo "VENDOR = $5">> config.mk[ "$6" ] && ["$6" != "NULL" ] && echo "SOC    = $6" >> config.mk

Create a file and append it ..

10. # Assign board directory to BOARDIR variable

if [ -z "$5" -o "$5" ="NULL" ] ; then   BOARDDIR=$4else    BOARDDIR=$5/$4Fi

The Board Sub-directory Samsung/smdk6410 is defined here

11、if[ "$APPEND" = "yes" ]    #Append to existing config filethen    echo>> config.helse    >config.h    # Create new config filefiecho "/* Automatically generated - donot edit */" >>config.h

APPEND = no. Therefore, create config. h under the current directory include.

11. fori in $ {TARGETS}; do

Echo "# define CONFIG_MK _ $ {I} 1"> config. h;

Done

I guess I exists in targets? It is null and does not exist. skip this step.

cat << EOF >> config.h#define CONFIG_BOARDDIR board/$BOARDDIR#include <config_defaults.h>#include <configs/$1.h>#include <asm/config.h>EOF

Open config. h and enter the above information.

Exit 0 should be the end character

At this point, the whole board-level Configuration Analysis is complete, and some places do not know whether the analysis is correct. Wait until the school is verifying it!