Support/Haswell

Intel processors of the Haswell architecture are very popular in 2013/2014-era ChromeOS devices.

Factory firmware support for booting legacy OSes via SeaBIOS is common, but custom firmware is also available for all Haswell models as well -- see Firmware.

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
   • Most models ship with this feature enabled and including a working SeaBIOS
   • On some models, includes bugfixes and enables additional functionality
   • Haswell: Most models ship with this feature enabled, but a few are buggy
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
   • Removes the white "OS verification is OFF" screen
   • Removes the ability to run ChromeOS natively, creating a small risk of bricking your device
   • Adds full hardware support for virtualization (vmx / VT-x)
   • This option is the most comprehensive and fixes many bugs and/or idiosyncrasies associated with the stock firmware

Model-Specific Notes

ASUS Chromebox, 2014 (PANTHER) / HP Chromebox, 2014 (ZAKO)

• Factory legacy boot firmware bug prevents use of attached USB devices at boot, including keyboard
  • While installation is possible with factory firmware, it is less than ideal.
  • Custom firmware does not have bug; update RW_LEGACY. See Installing/Panther.