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Ramdisks[edit source]
Ramdisks will run from the get go, just use xpwntool to pack / encrypt them using a vanilla ramdisk as the template. I am not sure if xpwntool will do this, so you may want to check the header to make sure the correct info (sizes etc) are there.
boot-args[edit source]
They use a buffer that is passed on when booting a kernel for boot args, the difference in 2.x is that the boot-args NVRAM var is totally ignored. Not only would a 'patch' be needed, but some code would actually need to be added, somehow.