Enable Verbose Boot
For the Repair Volume
Mount the repair partition.
mkdir /mnt/repair/ mount -t hfs /dev/disk0s2 /mnt/repair/
Edit /mnt/repair/com.apple.Boot.plist
: under key Kernel Flags
, add
-v
before rp=:///OS.dmg
For the normal OSBoot Volume
Edit /System/Library/CoreServices/com.apple.Boot.plist
: under key: Kernel Flags
, add
-v
Thanks to phoem for this information.