This is very much not an option on most embedded devices. They allow one key to be burned once.
IIRC, a certain Marvell SoC datasheet says multiple key slots are supported, but the boot ROM only supports reading the first entry (so really, only one key is supported).
IIRC, a certain Marvell SoC datasheet says multiple key slots are supported, but the boot ROM only supports reading the first entry (so really, only one key is supported).