#U BOOT COMMANDS INSTALL#
#U BOOT COMMANDS SERIAL#
#U BOOT COMMANDS DRIVERS#

the selected configuration file: configs/stm32mp*_defconfig.

options defined in Kconfig files (CONFIG_ compilation flags).

Kbuild infrastructure (as in Linux Kernel, you can use make menuconfig in U-Boot).

The U-Boot binary configuration is based on

pass the control to the Linux kernel (or to another target application).

#U BOOT COMMANDS INSTALL#

install the secure monitor (optional) or.load and check images (such as kernel, device tree and ramdisk).Execution of the boot command (by default bootcmd=CONFIG_BOOTCOMMAND):ДЇor example, execution of the command bootm to:.Command execution through autoboot (CONFIG_AUTOBOOT) or console shell.Post-relocation initialization:(common/board_r.c): initialization of all the drivers.Relocation: copy of the code to the end of DDR memory.Pre-relocation initialization (common/board_f.c): minimal initialization (such as CPU, clock, reset, DDR and console) running at the CONFIG_SYS_TEXT_BASE load address.U-Boot executes the following main steps in DDR memory: USB: host (mass storage) or device (DFU stack).Display: LCD, HDMI, BMP for splashcreen.It supports the following features and commands:.It manages several internal and external devices such as NAND and NOR Flash memories, Ethernet and USB.It loads the kernel into RAM and gives control to the kernel.

#U BOOT COMMANDS SERIAL#

It features a simple command line interface (CLI), allowing users to interact over a serial port console.

U-Boot is the second-stage bootloader (SSBL) of boot chain for STM32 MPU platforms.

loading and execution of U-Boot (or Kernel in Falcon mode : README.falcon ).Дў.2 U-Boot: SSBL 2.2.1 U-Boot description.

#U BOOT COMMANDS DRIVERS#

board_init_r(): initialization of the other drivers activated in the SPL device tree.configuration of heap in DDR memory (CONFIG_SPL_SYS_MALLOC_F_LEN).board_init_f(): driver initialization including DDR initialization (mininimal stack and heap: CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN).SPL executes the following main steps in SYSRAM: There is no workaround for these limitations. SCMI support for clock and reset (not compatible with latest Linux kernel device tree).

limited features (STM32CubeProgrammer / boot from NAND Flash memory).

However, several known limitations have been identified when SPL is used in conjunction with the minimal secure monitor provided within U-Boot for basic boot chain. SPL is provided only as an example of the simplest FSBL with the objective to support upstream U-Boot development. SPL cannot be used for product development.

It loads the SSBL (U-Boot) into the DDR memory.

It performs the initial CPU and board configuration (clocks and DDR memory).

It is a small binary (bootstrap utility) generated from the U-Boot source and stored in the internal limited-size embedded RAM. The U-Boot SPL or SPL is an alternate first stage bootloader (FSBL).

U boot commands