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2014-10 u-boot config.mk分析

2024-08-10 07:45:41   218人阅读

/**
******************************************************************************
* @author ? ?Maoxiao Hu
* @version ? V1.0.0
* @date ? ? ? Dec-2014
******************************************************************************
* < COPYRIGHT 2014 ISE of SHANDONG UNIVERSITY >
*******************************************************************************
**/
?
Based on u-boot-2014-10.
config.mk的内容并不长，这里全部贴出来吧。
这里以已经执行完make trats_defconfig，在顶层目录已经生成了.config文件为例，说明config.mk中各变量的取值。
?

?15?PLATFORM_RELFLAGS?:=

?16?PLATFORM_CPPFLAGS?:=

?17?PLATFORM_LDFLAGS?:=

?18?LDFLAGS?:=

?19?LDFLAGS_FINAL?:=

?20?OBJCOPYFLAGS?:=

?21?#########################################################################

?22?

?23?ARCH?:=?$(CONFIG_SYS_ARCH:"%"=%)

?24?CPU?:=?$(CONFIG_SYS_CPU:"%"=%)

?25?BOARD?:=?$(CONFIG_SYS_BOARD:"%"=%)

?26?ifneq?($(CONFIG_SYS_VENDOR),)

?27?VENDOR?:=?$(CONFIG_SYS_VENDOR:"%"=%)

?28?endif

?29?ifneq?($(CONFIG_SYS_SOC),)

?30?SOC?:=?$(CONFIG_SYS_SOC:"%"=%)

?31?endif

?32?

?33?# Some architecture config.mk files need to know what CPUDIR is set to,

?34?# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.

?35?# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains

?36?# CPU-specific code.

?37?CPUDIR=arch/$(ARCH)/cpu$(if?$(CPU),/$(CPU),)

?38?

?39?sinclude$(srctree)/arch/$(ARCH)/config.mk??# include architecture dependend rules

?40?sinclude$(srctree)/$(CPUDIR)/config.mk ? ??# include? CPU? specific rules

?41?

?42?ifdef?? SOC

?43?sinclude$(srctree)/$(CPUDIR)/$(SOC)/config.mk??# include? SoC? specific rules

?44?endif

?45?ifneq?($(BOARD),)

?46?ifdef?? VENDOR

?47?BOARDDIR?=?$(VENDOR)/$(BOARD)

?48?else

?49?BOARDDIR?=?$(BOARD)

?50?endif

?51?endif

?52?ifdef?? BOARD

?53?sinclude$(srctree)/board/$(BOARDDIR)/config.mk?# include board specific rules

?54?endif

?55?

?56?ifdef?FTRACE

?57?PLATFORM_CPPFLAGS?+= -finstrument-functions -DFTRACE

?58?endif

?59?

?60?#########################################################################

?61?

?62?RELFLAGS?:=?$(PLATFORM_RELFLAGS)

?63?

?64?OBJCOPYFLAGS?+= --gap-fill=0xff

?65?

?66?PLATFORM_CPPFLAGS?+=?$(RELFLAGS)

?67?PLATFORM_CPPFLAGS?+= -pipe

?68?

?69?LDFLAGS?+=?$(PLATFORM_LDFLAGS)

?70?LDFLAGS_FINAL?+= -Bstatic

?71?

?72?export PLATFORM_CPPFLAGS

?73?export RELFLAGS

?74?export LDFLAGS_FINAL

?75?export CONFIG_STANDALONE_LOAD_ADDR

?
?
config.mk被顶层Makefile包含，通过：

include$(srctree)/config.mk

这句话。
?
ARCH?:=?$(CONFIG_SYS_ARCH:"%"=%)
ARCH = “arm”
CPU?:=?$(CONFIG_SYS_CPU:"%"=%)
CPU = “armv7”
BOARD?:=?$(CONFIG_SYS_BOARD:"%"=%)
BOARD = “trats”
?

ifneq?($(CONFIG_SYS_VENDOR),)

?VENDOR?:=?$(CONFIG_SYS_VENDOR:"%"=%)

endif

在这里CONFIG_SYS_VENDOR = “samsung” 所以 VENDOR = “samsung”
?

ifneq?($(CONFIG_SYS_SOC),)

SOC?:=?$(CONFIG_SYS_SOC:"%"=%)

endif

在这里CONFIG_SYS_SOC = “exynos” 所以 SOC = “exynos”
?
CPUDIR=arch/$(ARCH)/cpu$(if?$(CPU),/$(CPU),)
替换已知变量：
CPUDIR=arch/arm/cpu/arm
?

sinclude$(srctree)/arch/$(ARCH)/config.mk??# include architecture dependend rules

sinclude$(srctree)/$(CPUDIR)/config.mk ? ??# include? CPU? specific rules

替换已知变量：

sinclude$(srctree)/arch/arm/config.mk??# include architecture dependend rules

sinclude$(srctree)/arch/arm/cpu/arm/config.mk ? ??# include? CPU? specific rules

?
?

?42?ifdef?? SOC

?43?sinclude$(srctree)/$(CPUDIR)/$(SOC)/config.mk??# include? SoC? specific rules

?44?endif

已定义SOC，替换已知变量：

?43?sinclude$(srctree)/arch/arm/cpu/arm/exynos/config.mk??# include? SoC? specific rules

?

?45?ifneq?($(BOARD),)

?46?ifdef?? VENDOR

?47?BOARDDIR?=?$(VENDOR)/$(BOARD)

?48?else

?49?BOARDDIR?=?$(BOARD)

?50?endif

?51?endif

BOARD变量不为空，且已定义VENDOR，替换已知变量：

?47?BOARDDIR?=?samsung/trats

?

?52?ifdef?? BOARD

?53?sinclude$(srctree)/board/$(BOARDDIR)/config.mk?# include board specific rules

?54?endif

已定义BOARD，替换已知变量：

?53?sinclude$(srctree)/board/samsung/trats/config.mk?# include board specific rules

?
其它编译选项就不做解释了。

2014-10 u-boot config.mk分析


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