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Developer and Recovery mode
Table 21. Developer and Recovery mode
Developer Mode
•
Used to boot without verification.
•
Can be turned on via key combination during boot.
•
Stateful partition is wiped during transitions.
•
Used in the factory to boot test image.
Coreboot and U-boot Custom Firmware
Coreboot (x86 only)
•
Memory and chipset initialization
•
Open-source, except for MRC binary from Intel.
U-Boot
•
Performs verified boot
•
Handles recovery and Developer Mode
•
Open source code
Normal boot is very fast, as it takes less than 1 second to start loading kernel. Chromebook does not boot other operating systems such as
Windows or OS X.
Recovery Mode
•
Allows a user to reinstall the Chrome OS from a USB key or SD
card.
•
Recovery mode is entered if verified boot fails.
•
A user can force recovery mode via a key combination during
boot.
Software
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