Difference between revisions of "Support/SandyIvy"

Revision as of 02:18, 23 December 2015

Intel processors with Sandy Bridge and Ivy Bridge cores are only used in a few ChromeOS devices.

Factory firmware support for coreboot and SeaBIOS is limited, but custom firmware is available for all Sandy/Ivy Bridge models from John Lewis: https://johnlewis.ie/custom-chromebook-firmware/rom-download/.

There are three firmware update options available:

1. RW_LEGACY
   • Leaves all stock functionality intact, including the white "OS verification is OFF" screen
   • Allows device to dual-boot GalliumOS alongside ChromeOS
   • Some models ship with this feature enabled and including a working SeaBIOS
   • On some models, includes bugfixes and enables additional functionality such as booting from SD card/eMMC
   • Sandy/Ivy Bridge: only available for the Google Pixel 2013 (LINK)
2. BOOT_STUB
   • Bypasses the white "OS verification is OFF" screen
   • Removes the ability to run ChromeOS natively, creating a small risk of bricking your device
   • Leaves the “REFRESH + POWER” functionality of the stock ROM intact
     • If you engage this key sequence, device will reboot and try to run ChromeOS Recovery (which will fail)
     • This process will repeat on every boot until you disassemble the device and briefly disconnect the battery
3. Full ROM
   • Installs a complete ROM containing a coreboot build and a working SeaBIOS
   • Bypasses the white "OS verification is OFF" screen
   • Removes the ability to run ChromeOS natively, creating a small risk of bricking your device
   • Will wipe out all product data
   • This option is the most invasive and may include bugs or idiosyncrasies that the stock firmware does not
   • Sandy/Ivy Bridge: Enables hardware virtualization extensions and suspend