Difference between revisions of "Novena/EEPROM"

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(Feature bitmask)
(Feature bitmask)
Line 35: Line 35:
 
! scope="col" | Feature
 
! scope="col" | Feature
 
|-
 
|-
| 0 || 0x01 || ES8328 Audio Codec
+
| 0 || 0x0001 || ES8328 Audio Codec
 
|-
 
|-
| 1 || 0x02 || Battery board
+
| 1 || 0x0002 || Battery board
 
|-
 
|-
| 2 || 0x04 || Retina LVDS display
+
| 2 || 0x0004 || Retina LVDS display
 
|-
 
|-
| 3 || 0x08 || (Reserved: Other LVDS display)
+
| 3 || 0x0008 || (Reserved: Other LVDS display)
 
|-
 
|-
| 4 || 0x10 || mPCIe port
+
| 4 || 0x0010 || mPCIe port
 
|-
 
|-
| 5 || 0x20 || Gigabit Ethernet
+
| 5 || 0x0020 || Gigabit Ethernet
 +
|-
 +
| 6 || 0x0040 || HDMI Output
 
|}
 
|}

Revision as of 06:40, 7 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

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 Mask Feature
0 0x0001 ES8328 Audio Codec
1 0x0002 Battery board
2 0x0004 Retina LVDS display
3 0x0008 (Reserved: Other LVDS display)
4 0x0010 mPCIe port
5 0x0020 Gigabit Ethernet
6 0x0040 HDMI Output