iesvilla.blogg.se - Linux u boot tutorial

LINUX U BOOT TUTORIAL INSTALL
LINUX U BOOT TUTORIAL SERIAL
LINUX U BOOT TUTORIAL DRIVERS
LINUX U BOOT TUTORIAL UPDATE
LINUX U BOOT TUTORIAL DRIVER

Localmodconfig - Update current config disabling modules not loaded Oldconfig - Update current config utilising a provided. Gconfig - Update current config utilising a GTK+ based front-end Xconfig - Update current config utilising a Qt based front-end Menuconfig - Update current config utilising a menu based program Nconfig - Update current config utilising a ncurses menu based The other makefile targets are the following:Ĭonfig - Update current config utilising a line-oriented program It can then be compared with the predefined configuration (configs/stm32mp*defconfig). This target saves the current config as a defconfig file in the build directory. 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).

LINUX U BOOT TUTORIAL 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.

LINUX U BOOT TUTORIAL 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.

LINUX U BOOT TUTORIAL 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).

LINUX U BOOT TUTORIAL 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).