Dell Chromebook 11 3180 Disassembly and Reassembly Guide - For use by Certifie - Page 34

Developer and Recovery mode, Coreboot and U-boot Custom Firmware, Chrome vs Chromium OS

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Developer and Recovery mode Table 2. Developer and Recovery mode Developer Mode Recovery 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. • 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 (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 3. Difference between Chromium and Chrome OS Difference between Chromium and Chrome OS Chromium OS Chrome OS • Is an open source project: http://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). • Includes additional licensed features such as the Netflix plugin, video codecs, and fonts 34 Software

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Developer and Recovery mode
Table 2. Developer and Recovery mode
Developer Mode
Recovery 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.
•
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 (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 3. Difference between Chromium and Chrome OS
Difference between Chromium and Chrome OS
Chromium OS
Chrome OS
•
Is an open source project: http://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).
•
Includes additional licensed features such as the Netflix plugin,
video codecs, and fonts
34
Software