export CROSS_COMPILE=arm-none-eabi- ARCH=arm
make stm32h750-art-pi_defconfig
make menuconfig
	> Boot options        (console=ttySTM0,115200 root=/dev/ram loglevel=8) Boot arguments
	> Device Drivers > Serial drivers        (115200) Default baudrate
u-boot-v2021.07\arch\arm\dts\stm32h750i-art-pi.dts
	chosen {
		bootargs = "root=/dev/ram";
		stdout-path = "serial0:2000000n8";
	};
	chosen {
		bootargs = "root=/dev/ram";
		stdout-path = "serial0:115200n8";
	};
make -j 12

export CROSS_COMPILE=arm-none-eabi- ARCH=arm
make stm32f429-discovery_defconfig
arch/arm/dts/stm32f429-disco.dts
make -j 12

make CROSS_COMPILE=arm-none-eabi- ARCH=arm -j3 O=output/

config          - 使用行定向程序更新当前配置
nconfig         - 使用基于 ncurses 菜单的程序更新当前配置
menuconfig      - 使用基于菜单的程序更新当前配置
xconfig         - 使用基于 Qt 前端的程序更新当前配置
gconfig         - 使用基于 GTK+ 前端的程序更新当前配置
oldconfig       - 使用提供的 .config 作为基础更新当前配置
localmodconfig  - 更新当前配置，禁用未加载的模块
localyesconfig  - 更新当前配置，将本地模块转换为核心
defconfig       - 使用 ARCH 提供的默认配置创建新配置
savedefconfig   - 将当前配置保存为 ./defconfig（最小配置）
allnoconfig     - 创建一个所有选项都回答为 no 的新配置
allyesconfig    - 创建一个所有选项都接受为 yes 的新配置
allmodconfig    - 创建一个尽可能选择模块的新配置
alldefconfig    - 创建一个所有符号都设置为默认值的新配置
randconfig      - 创建一个所有选项都随机回答的新配置
listnewconfig   - 列出新选项
olddefconfig    - 与 oldconfig 相同，但将新符号设置为默认值而不提示
testconfig      - 运行 Kconfig 单元测试（需要 python3 和 pytest）

*
* U-Boot  Configuration
*
*
* Compiler: 
*
Architecture select
  1. ARC architecture (ARC)
> 2. ARM architecture (ARM)
  3. M68000 architecture (M68K)
  4. MicroBlaze architecture (MICROBLAZE)
  5. MIPS architecture (MIPS)
  6. Nios II architecture (NIOS2)
  7. PowerPC architecture (PPC)
  8. RISC-V architecture (RISCV)
  9. Sandbox (SANDBOX)
  10. SuperH architecture (SH)
  11. x86 architecture (X86)
  12. Xtensa architecture (XTENSA)
choice[1-12?]: 2
*
* Skipping low level initialization functions
*
Skip calls to certain low level initialization functions (SKIP_LOWLEVEL_INIT) [N/y/?] N
Skip call to lowlevel_init during early boot ONLY (SKIP_LOWLEVEL_INIT_ONLY) [N/y/?] N
*
* ARM architecture
*
ARM GICV2 driver (DRIVER_GICV2) [N/y/?] N
ARM GICV3 ITS (GIC_V3_ITS) [N/y/?] N
ARM GICV3 GIC600 SUPPORT (GICV3_SUPPORT_GIC600) [N/y/?] N
Do not enable icache (SYS_ICACHE_OFF) [N/y/?] N
Do not enable dcache (SYS_DCACHE_OFF) [N/y/?] N
CP15 based cache enabling support (SYS_ARM_CACHE_CP15) [N/y/?] N
MMU-based Paged Memory Management Support (SYS_ARM_MMU) [N/y/?] N
Use the ARM v7 PMSA Compliant MPU (SYS_ARM_MPU) [Y/?] y
Select the ARM data write cache policy
> 1. Write-back (WB) (SYS_ARM_CACHE_WRITEBACK)
  2. Write-through (WT) (SYS_ARM_CACHE_WRITETHROUGH)
  3. Write allocation (WA) (SYS_ARM_CACHE_WRITEALLOC)
choice[1-3?]: 0
Select the ARM data write cache policy
> 1. Write-back (WB) (SYS_ARM_CACHE_WRITEBACK)
  2. Write-through (WT) (SYS_ARM_CACHE_WRITETHROUGH)
  3. Write allocation (WA) (SYS_ARM_CACHE_WRITEALLOC)
choice[1-3?]: 1
Enable ARCH_CPU_INIT (ARCH_CPU_INIT) [N/y/?] n
Build U-Boot using the Thumb instruction set (SYS_THUMB_BUILD) [Y/?] y

ARM PL310 L2 cache controller (SYS_L2_PL310) [N/y/?] n
ARM PL310 L2 cache controller in SPL (SPL_SYS_L2_PL310) [N/y/?] ^C

embedsky@ubuntu:~/share/u-boot$ ./scripts/kconfig/conf --oldaskconfig Kconfig 

--listnewconfig         列出新的选项
--oldaskconfig          使用行定向程序开始新的配置
--oldconfig             使用提供的 .config 文件作为基础更新配置
--syncconfig            类似于 oldconfig，但生成的配置文件位于 include/{generated/,config/}
--olddefconfig          与 oldconfig 相同，但将新符号设置为默认值
--defconfig <file>      使用 <file> 中定义的默认值创建新的配置
--savedefconfig <file>  将当前最小配置保存到 <file>
--allnoconfig           创建一个所有选项都回答为 no 的新配置
--allyesconfig          创建一个所有选项都回答为 yes 的新配置
--allmodconfig          创建一个所有选项都回答为 mod 的新配置
--alldefconfig          创建一个所有符号都设置为默认值的新配置
--randconfig            创建一个所有选项都随机回答的新配置

embedsky@ubuntu:~/share/u-boot$ ./scripts/kconfig/mconf Kconfig 
.config:37:warning: symbol value '' invalid for ENV_OFFSET
.config:38:warning: symbol value '' invalid for ENV_SECT_SIZE
.config:47:warning: symbol value '' invalid for TPL_STACK
.config:52:warning: symbol value '' invalid for SYS_LOAD_ADDR
.config:57:warning: symbol value '' invalid for PRE_CON_BUF_ADDR
.config:108:warning: symbol value '' invalid for BOARD_SIZE_LIMIT
.config:116:warning: symbol value '' invalid for SYS_MONITOR_BASE
.config:827:warning: symbol value '' invalid for SYS_SATA_MAX_DEVICE

WARNING: unmet direct dependencies detected for NPCM_OTP
  Depends on [n]: ARM [=n] && ARCH_NPCM [=n]
  Selected by [y]:
  - NPCM_AES [=y]
Your display is too small to run Menuconfig!
It m ust be at least 19 lines by 80 columns.
 

WAING: unmet direct dependencies detected for NPCM_OTP
 Dpends on [n]: ARM [=n] && ARCH_NPCM [=n]
 S lected by [y]:
- NP CM_AES [=y]



 configuration changes were NOT saved.

`


建说明



执 make xxx_defconfig`时，会执行conf可执行文件的编译
后执 `./scripts/kconfig/conf --defconfig=generated_defconfig Kconfig`命令，生成配置文件

`ma

kefile
# scripts/kcon fig/Makefile  
  

 %defconfig: $(obj)/conf
    $(Q)$(CPP) -nostdinc -P -I $(srctree) -undef -x assembler-with-cpp $(srctree)/arch/$(SRCARCH)/configs/$@ -o generated_defconfig
    $(Q)$< $(silent) --defconfig=generated_defconfig $(Kconfig)

arm-none-eabi-gcc -E -nostdinc -P -I . -undef -x assembler-with-cpp ./arch/../configs/stm32h750-art-pi_defconfig -o generated_defconfig
nfig/conf  --defconfig=generated_defconfig Kconfig

objdump -d start.o