These two memory areas store settings and information that is not cleared whenever you turn off your Mac’s power.
To do this, you’ll want to turn off your Mac, and then turn it back on while holding down the Command Option P R keys.
Thus, the firmware is implemented in Forth, and stored in the ROM as FCode bytecode.
Device drivers that are required during system startup are also implemented similarly.
Apple and Sun are two prominent computer system makers that use implementations of Open Firmware in their systems (Sun's trademark is called ).
Sometimes, launching your Mac this way can help save you a trip to the Apple Store. Instead, turn to this guide in which we explain all of the various boot options in OS X that may help return your Mac to normal. You can hold down the C key on your keyboard to instantly boot to a Mac OS X or other bootable disc in your Mac.Next, try manually clearing some of the caches that may be relevant to the Finder.These include those for the Finder as well as related services like i Cloud Drive.I am getting past this error, when using Use Kernel Cache=Yes, but I can't complete the booting. and the cache at /System/Library/Caches/com.caches Type rm -R /System/Library/Caches/com.caches which will cause them to be rebuilt at the next boot. This works, but if I try to change something on the HDD, the commands fail with the message "read only file system". // Edit: Forget to run /sbin/mount -uw / Now i can make changes to filesystem. After deleting the old cache files, I can't even get to the command prompt via -v -s (with and without User Kernel Cache=Yes).Some posts suggests that I should rebuild the kernel cache. It is also strange, that the terminal doesn't recognize sudo.. I tried it with rd=disk0, rd=disk0s1, rd=disk0s2, rd=disk0s3, rd=disk1, rd=disk1s1, rd=disk1s2, rd=disk1s3 but no success...