Difference between revisions of "Novena/EEPROM"
(→Feature bitmask) |
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! scope="col" | Bit position | ! scope="col" | Bit position | ||
| + | ! scope="col" | Mask | ||
! scope="col" | Feature | ! scope="col" | Feature | ||
|- | |- | ||
| − | | | + | | 0 || 0x01 || ES8328 Audio Codec |
|- | |- | ||
| − | | | + | | 1 || 0x02 || Battery board |
|- | |- | ||
| − | | | + | | 2 || 0x04 || Retina LVDS display |
|- | |- | ||
| − | | | + | | 3 || 0x08 || (Reserved: Other LVDS display) |
|- | |- | ||
| − | | | + | | 4 || 0x10 || mPCIe port |
| + | |- | ||
| + | | 5 || 0x20 || Gigabit Ethernet | ||
|} | |} | ||
Revision as of 12:30, 3 October 2013
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
| 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).
| Bit position | Mask | Feature |
|---|---|---|
| 0 | 0x01 | ES8328 Audio Codec |
| 1 | 0x02 | Battery board |
| 2 | 0x04 | Retina LVDS display |
| 3 | 0x08 | (Reserved: Other LVDS display) |
| 4 | 0x10 | mPCIe port |
| 5 | 0x20 | Gigabit Ethernet |
