What is SPL in U-Boot?

SPL (Secondary Program Loader) is a small binary, generated from U-Boot source, that fits in the SRAM and loads the main U-Boot into system RAM. between the SPL and the main U-Boot. – SPL also relies heavily on toolchain garbage collection.

What is SPL load?

To be clear: SPL stands for Secondary Program Loader. Which means that ROM code is the first thing that loads (and executes) other program, and SPL is the second thing that loads (and executes) other program.

What does U-Boot do?

U-Boot boots an operating system by reading the kernel and any other required data (e.g. device tree or ramdisk image) into memory, and then executing the kernel with the appropriate arguments. U-Boot’s commands are actually generalized commands which can be used to read or write any arbitrary data.

What is SPL Linux?

The Solaris Porting Layer, SPL, is a Linux kernel module which provides a compatibility layer used by the ZFS on Linux project.

What is SPL MLO?

“MLO” is the second-stage bootloader. The second-stage bootloader can apparently be one of either the X-loader or SPL. This bootloader apparently also just reads the first partition of the SD card, and loads a file called “u-boot. bin”, and executes it.

How do I boot from U-Boot?

BOOTING USING NOR FLASH:

1. Download uImage and copy it to NOR flash partition. NOTE: The size and offset values given below are to be considered representative only.
2. Download ramdisk and copy it to NOR flash partition.
3. Setup the bootargs and bootcmd environment variables to boot from SPI flash.

Is Systemd boot faster than grub?

The systemd-boot is basically an interface for the boot logic included in EFI, which is why it can only be used with compatible EFI systems. With its limited interface, systemd is a far smaller bootloader than Grub. Some people install it for speed or to manage multiple operating systems more effectively.

How do you boot a load kernel?

What is U-Boot?

1. Connect the Ethernet cable to the Physical Board (Embedded Processor ).
2. Copy the kernel image (uImage) to the /TFTP boot directory of your Linux host workstation.
3. Copy the file system image from the /TFTP boot directory of your Linux host workstation.

How does embedded Linux boot?

The Linux boot process involves the following steps: After a processor is reset, it executes ROM startup code. The ROM startup code initializes the CPU, memory controller, and on-chip devices, and it configures the memory map. The ROM startup code then executes a bootloader.

How do you make a Raspberry Pi boot?

RPi U-Boot

1. 1 Overview.
2. 2 Get the source. 2.1 Mainline. 2.2 Stephen Warren’s work-in-progress branch. 2.3 Oleksandr Tymoshenko’s branch.
3. 3 Get an ARM compiler. 3.1 Ubuntu packages. 3.2 Raspberry Pi Foundation Tools.
4. 4 Compile the source.
5. 5 Copy U-Boot to your SD card.
6. 6 Test U-Boot.
7. 7 Kernel Command-Line.
8. 8 Booting from an SD card.

What does the SPL do in U-Boot?

The SPL has very limited configuration or user interaction, and mainly serves to initialize the external DDR memory and set-up the boot process for the next bootloader stage: U-Boot. U-Boot allows for powerful command-based control over the kernel boot environment via a serial terminal.

Which is the second stage of U-Boot?

For more information on the SYSBOOT pins and associated boot parameters see the device TRM. The second stage bootloader is known as the SPL (Secondary Program Loader), but is sometimes referred to as the MLO (MMC Card Loader). The SPL is the first stage of U-Boot, and must be loaded from one of the boot sources into internal RAM.

What does U-Boot do in a serial terminal?

U-Boot allows for powerful command-based control over the kernel boot environment via a serial terminal. The user has control over a number of parameters such as boot arguments and the kernel boot command. In addition, U-Boot environment variables can be configured.

What does uBoot SPL do on Altera Cyclone V?

The U-boot SPL, which functions as the preloader, contains board-specific initialization code, which sets up the processor’s registers to reflect the settings made in Qsys: That the correct UART is used, the DDR memory becomes usable and the pins designated as GPIO start to behave like such, etc.