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This is a requirement of the the kernel[1]. Failing to do so may lead to boot failures. 1. https://www.kernel.org/doc/Documentation/arm/Booting Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
This function returns a pointer to the string of the property 'bootargs' present in the 'chosen' node. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
The DTB may have a property for this purpose. If no command line is given by board_override_cmd_line() or board_override_cmd_line_ext(), it makes sens to use it. In that case the amount of memory is prepended to the DTB bootargs. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
A FIT image is an image container. It usualy contains the kernel, one or more DTB, and optionnaly a initramfs. It is commonly used on ARM. If this option is selected, it is still possible to load a classic kernel image. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
The kernel may use an initial root file system located in RAM before the final root filesystem is available. A FIT image may contain such a ramdisk image. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
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The FIT image is a widely used image format. With it, it becomes possible to package a linux kernel, one or more dtb and a initramfs into a single image.
There are practical advantages to do so:
This series adds support for FIT image stored in NAND and SPI Flash. Support for other storage media should be easy to add.