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Developer and Recovery mode
Table 5. 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.
Chrome vs Chromium OS
Table 6. Difference between Chromium and Chrome OS
Chromium OS
● Is an open source project: http://www.chromium.org/
chromium-os
● Runs on regular PCs and Chrome devices
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Software
Difference between Chromium and Chrome OS
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.
Chrome OS
● Is based on Chromium OS
● Only runs on the Chrome devices with required hardware
features (TPM, RO firmware, recovery button, developer
switch).
● Includes additional licensed features such as the Netflix
plugin, video codecs, and fonts
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