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As there is no common firmware interface on all ARM platforms, the steps required to make the system bootable on ARM devices are highly device-dependent. Ubuntu uses a tool called flash-kernel to take care of this. Flash-kernel contains a database which describes the particular operations that are required to make the system bootable on various devices. It detects whether the current device is supported, and if yes, performs the necessary operations.
On devices which boot from internal NOR- or NAND-flash memory, flash-kernel writes the kernel and the initial ramdisk to this internal memory. This method is particularly common on older armel devices. Please note that most of these devices do not allow having multiple kernels and ramdisks in their internal flash memory, i.e. running flash-kernel on them usually overwrites the previous contents of the flash memory!
For ARM systems that use U-Boot as their system firmware and boot the kernel and the initial ramdisk from external storage media (such as MMC/SD-cards, USB mass storage devices or IDE/SATA hard- disks), flash-kernel generates an appropriate boot script to allow autobooting without user interaction.
6.3.6.3. Continue Without Boot Loader