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Add a section about what the firmware should do in EL3 before starting Xen. E.g guest will use HVC instruction to issue hypercall. As this can be set only at EL3, i.e. outside Xen, document this boot requirement. Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>