The main catalogue and structure of u-boot analysis and Transplant U-boot

U-boot Official Download Website:

ftp://ftp.denx.de/pub/u-boot/

This site is a collection of FTP downloads from the German Denx Software Center

Take U-boot 2013.10 as an example:

U-boot -2010.03 main directory structure and description
Cpu	The architecture proprietary files correspond to different CPUs, such as arm720t,arm920t,arm1136, etc.;
Api	System-independent APIs used by external programs
Board	Development boards that include different configuration types (even if the CPU is the same), such as smdk2410,sbc2410x;
Common	General function, more is the next layer of the driver package;
Disk	disk partition processing program;
Doc	Develop the use of documentation (don't expect it to be of much help, O (∩_∩) o~)
Drivers	The drivers for all kinds of tool devices are basically generic, and they introduce platform/board related functions from the outside through macros;
Example	Some test programs that can be run using U-boot after downloading
Fs	File system
Include	Header and Development Board configuration files, the Development Board configuration files are placed in the Include/configs directory, U-boot does not make menuconfig similar menu for visual configuration, need to manually modify the macro definition in the configuration file
Lib _*	Files that are common to all architectures;
Nand_spl	U-boot generally start from the ROM, NOR flash devices, and now support starting from NAND flash, but the number of supported CPUs is not many;
Net	various network protocol files;
Post	Power-on self-test procedure
Rtc	Driver files for real-time clocks
Tools	Tools for making u-boot format images, such as mkimage;

The main catalogue and structure of u-boot analysis and Transplant U-boot