Novena/EEPROM

Novena has a utility EEPROM that can be used for storing device-specific data. This is optional, and default values will be used if it is blank / not present.

All multi-byte integers are in native host order.

Structure

EEPROM structure

Size	Default Value	Description	Result if no EEPROM present
6	'Novena'	Unterminated EEPROM signature	The EEPROM contents will not be used
1	1	Version number of EEPROM structure	The EEPROM contents will not be used
1	0	Reserved	No change
4	0	Device serial number	No change
6	(Random)	Gigabit MAC address	Random MAC address is generated on each boot
2	0	Feature bitmask	No features are enabled

Feature bitmask

There is a bitmask field that defines various board features. In this way, a single image can be shipped that supports various components. For example, a router might not have a display, but a laptop would need to have its LCD turned on. A bit is "1" if the feature is present (and needs to be enabled), and "0" if it is not present. Note that some values are mutually-exclusive (e.g. you can only have one kind of LVDS display attached).

Feature list

Bit position	Feature
1	ES8328 Audio Codec
2	Battery board
3	Retina LVDS display
4	(Reserved: Other LVDS display)