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https://github.com/brain-hackers/u-boot-brain
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51148790f2
This commit enables Kconfig.
Going forward, we use Kconfig for the board configuration.
mkconfig will never be used. Nor will include/config.mk be generated.
Kconfig must be adjusted for U-Boot because our situation is
a little more complicated than Linux Kernel.
We have to generate multiple boot images (Normal, SPL, TPL)
from one source tree.
Each image needs its own configuration input.
Usage:
Run "make <board>_defconfig" to do the board configuration.
It will create the .config file and additionally spl/.config, tpl/.config
if SPL, TPL is enabled, respectively.
You can use "make config", "make menuconfig" etc. to create
a new .config or modify the existing one.
Use "make spl/config", "make spl/menuconfig" etc. for spl/.config
and do likewise for tpl/.config file.
The generic syntax of configuration targets for SPL, TPL is:
<target_image>/<config_command>
Here, <target_image> is either 'spl' or 'tpl'
<config_command> is 'config', 'menuconfig', 'xconfig', etc.
When the configuration is done, run "make".
(Or "make <board>_defconfig all" will do the configuration and build
in one time.)
For futher information of how Kconfig works in U-Boot,
please read the comment block of scripts/multiconfig.py.
By the way, there is another item worth remarking here:
coexistence of Kconfig and board herder files.
Prior to Kconfig, we used C headers to define a set of configs.
We expect a very long term to migrate from C headers to Kconfig.
Two different infractructure must coexist in the interim.
In our former configuration scheme, include/autoconf.mk was generated
for use in makefiles.
It is still generated under include/, spl/include/, tpl/include/ directory
for the Normal, SPL, TPL image, respectively.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
72 lines
2.0 KiB
Makefile
72 lines
2.0 KiB
Makefile
#
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# (C) Copyright 2000-2013
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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#########################################################################
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# This file is included from ./Makefile and spl/Makefile.
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# Clean the state to avoid the same flags added twice.
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#
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# (Tegra needs different flags for SPL.
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# That's the reason why this file must be included from spl/Makefile too.
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# If we did not have Tegra SoCs, build system would be much simpler...)
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PLATFORM_RELFLAGS :=
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PLATFORM_CPPFLAGS :=
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PLATFORM_LDFLAGS :=
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LDFLAGS :=
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LDFLAGS_FINAL :=
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OBJCOPYFLAGS :=
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#########################################################################
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ARCH := $(CONFIG_SYS_ARCH:"%"=%)
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CPU := $(CONFIG_SYS_CPU:"%"=%)
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BOARD := $(CONFIG_SYS_BOARD:"%"=%)
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ifneq ($(CONFIG_SYS_VENDOR),)
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VENDOR := $(CONFIG_SYS_VENDOR:"%"=%)
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endif
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ifneq ($(CONFIG_SYS_SOC),)
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SOC := $(CONFIG_SYS_SOC:"%"=%)
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endif
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# Some architecture config.mk files need to know what CPUDIR is set to,
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# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
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# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
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# CPU-specific code.
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CPUDIR=arch/$(ARCH)/cpu$(if $(CPU),/$(CPU),)
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sinclude $(srctree)/arch/$(ARCH)/config.mk # include architecture dependend rules
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sinclude $(srctree)/$(CPUDIR)/config.mk # include CPU specific rules
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ifdef SOC
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sinclude $(srctree)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
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endif
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ifneq ($(BOARD),)
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ifdef VENDOR
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BOARDDIR = $(VENDOR)/$(BOARD)
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else
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BOARDDIR = $(BOARD)
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endif
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endif
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ifdef BOARD
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sinclude $(srctree)/board/$(BOARDDIR)/config.mk # include board specific rules
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endif
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#########################################################################
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RELFLAGS := $(PLATFORM_RELFLAGS)
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OBJCOPYFLAGS += --gap-fill=0xff
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PLATFORM_CPPFLAGS += $(RELFLAGS)
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PLATFORM_CPPFLAGS += -pipe
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LDFLAGS += $(PLATFORM_LDFLAGS)
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LDFLAGS_FINAL += -Bstatic
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export PLATFORM_CPPFLAGS
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export RELFLAGS
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export LDFLAGS_FINAL
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export CONFIG_STANDALONE_LOAD_ADDR
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