Support/Haswell

Intel processors with Haswell cores are very popular in 2013-era ChromeOS devices.

Factory firmware support for coreboot and SeaBIOS is common, but custom firmware is also available for all Haswell models from John Lewis: https://johnlewis.ie/custom-chromebook-firmware/rom-download/.

There are three firmware update options available:

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
- Haswell: Most models ship with this feature enabled, but a few are buggy
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
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

Model-Specific Notes

Factory firmware bug prevents use of USB keyboard
- Custom firmware does not have bug; update RW_LEGACY. See Installing/Panther.
- Factory firmware reported fixed in version Google_Panther.4920.24.26. See https://www.reddit.com/r/GalliumOS/comments/3z1xxs/success_asus_chromebox_using_chrx/.