Figure 2. 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.
Coreboot and U-boot Custom Firmware
Coreboot
• 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 few second to start loading kernel. Chrome devices does not boot other operating systems such as
Windows or OS X.
Chrome vs Chromium OS
Table 20. Difference between Chromium and Chrome OS
Difference between Chromium and Chrome OS
Chromium OS Chrome OS
• Is an open source project: https://www.chromium.org/
chromium-os
• Runs on regular PCs and Chrome devices
• Is based on Chromium OS
• Only runs on the Chrome devices with required hardware
features (TPM, RO firmware, recovery button, developer
switch).
Software 25
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