Raw Kernel Image Support for Falcon Mode Boot Via SPI Devices

Hi All,

While trying to bring up Falcon Mode boot on an ARM64 board, I've discovered that the SPL+SPI(spl_spi.c) driver does not allow us to load a raw kernel image and subsequently call the bootz_setup() function which resides in spl_parse_image_header().

I've added a new config option (CONFIG_SYS_SPI_KERNEL_SKIP_HEADER) which will skip the mkimage header check, allowing the subsequent spl_parse_image_header() call to successfully fall through to bootz_setup() and load/boot a raw kernel image.

Sincerely, Nathan Barrett-Morrison