This was quite fast considering that Apple opened up booting custom objects sometime last week…it seems to still be software rendering for now, but it's good to see this progressing so quickly. It seems that there is effort being put into upstreaming this too (despite a couple of unfortunately hitches :/) so we might be seeing this ready for general-purpose use quite soon!
Apple officially opened up booting custom images on the M1? Do you have any more information about this? I had a quick search and couldn’t find any news stories.
It’s not something that would probably get reported widely, but the bputil command (which manages boot policy, as the name suggests) and kmutil now work as of the second beta of 11.2 and allow for you to provide your own code to run.
"macOS Big Sur 11.2 beta 2 is out with full custom kernel support" ... "The OS now finally includes the firmware and bootloaders and tools necessary to replace Big Sur with not-Big-Sur. That was previously not possible."
