Dell Chromebook 11 3189 Disassembly and Reassembly Guide - For use by Certifie - Page 38

Developer and Recovery mode, Coreboot + U-boot Custom Firmware

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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 + 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. 38 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 + 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.
38
Software