militrinity.blogg.se - Adding i2c u boot commands

ADDING I2C U BOOT COMMANDS INSTALL
ADDING I2C U BOOT COMMANDS SERIAL
ADDING I2C U BOOT COMMANDS DRIVERS
ADDING I2C U BOOT COMMANDS DRIVER

Save your configuration to be able to use it as a defconfig file: Warning: the modification is performed locally in the build directory. You can then compile U-Boot with the updated. Make menuconfig -> menu based program make config -> line-oriented configuration make xconfig -> QT program make gconfig -> GTK program make nconfig -> ncurse menu based program config) by using one of the following five make commands:

Change the U-Boot compile configuration (modify.

Select a predefined configuration (defconfig file in configs directory ) and generate the first.

config file located in the build directory, with the same makefile target. Like the kernel, the U-Boot build system is based on configuration symbols (defined in Kconfig files). Hence to compile U-Boot, select the and the device tree for the board in order to choose a predefined configuration. įor example, CONFIG_ SPL activates the SPL compilation.

DeviceTree: U-Boot binaries include a device tree blob that is parsed at runtimeĪll the configuration flags (prefixed by CONFIG_) are described in the source code, either in the README file or in the documentation directory.

STM32MP15x lines : include/configs/stm32mp15_st_common.h.

STM32MP13x lines : include/configs/stm32mp13_st_common.h.

The file name is configured through CONFIG_SYS_CONFIG_NAME, for example on STMicroelectronics boards:

other compilation flags defined in include/configs/stm32mp*.h (these flags are progressively migrated to Kconfig).

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).

ADDING I2C 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):įor 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.

ADDING I2C 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 Arm ® Cortex ® MPUs. loading and execution of U-Boot (or Kernel in Falcon mode : README.falcon ).Ģ.2 U-Boot: SSBL 2.2.1 U-Boot description.

ADDING I2C 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).

ADDING I2C U BOOT COMMANDS DRIVER

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: SPL is not supported in OpenSTLinux as alternate FSBL: it 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).