![]() ![]() The only deviations from this are when you press one of the startup key combinations to alter this list. if that volume is not present (or NVRAM is reset to defaults), find the first viable boot volume in the local device tree and hand things off to mach_kernel (et. ![]() ![]() launch mach_kernel (or EFI on Windows / Linux side of things) and exit.read the value of the startup disk from NVRAM.This is the hardware behavior and unless you rewrite the code / replace the hardware, you are bound by this functionality. Intel Macs have the following basic behavior at boot time when the chime indicates a successful POST. When a mac can't find the first viable image to boot, it's programmed to get the prohibitory icon - not the boot picker. You don't without modifying things on a low level or adding custom software like the awesome Boot Runner. ![]()
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