UEFI_DRIVER dependencies

[Michael Zimmermann <sigmaepsilon92@gmail.com>]

I know that UEFI_DRIVERs don't need or support Depex sections, but
what if an UEFI_DRIVER depends on a protocol provided by another
UEFI_DRIVER?
Since they get loaded automatically because I put them in my
platform's fdf, it raises the question of the loading order.

Will they get loaded in the order they're defined? How often will the
core retry if one of the drivers returns EFI_NOT_READY?

Thanks,
Michael