| ??? 12/08/07 10:51 Read: times Msg Score: +1 +1 Informative |
#147986 - the Embedded Controler is always powered and Responding to: ???'s previous message |
(if there is power available) and it handles
- the LEDs - the keys beside the screen - on-board temperature sensor - power to WLAN and CPU - it passes the data from keyboard/touchpad to the CPU - the one-wire interface to the battery fuel gauge IC - battery charging The command list the EC is expected to handle would be here http://wiki.laptop.org/go/Ec_specification The way the EC connects to its code memory is interesting: Code memory of the EC is the first 64 kByte block within a serial 1 MByte(*) flash (SPI) which is also used for the firmware of the Geode LX:) And the Geode LX (the main CPU, thanks Andy) connects via a LPC (http://en.wikipedia.org/wiki/Low_Pin_Count) interface to the EC. On boot the Geode LX reads its firmware from the SPI flash through the LPC interface. Later, when the Geode LX is up it then uses the LPC interface to pass commands (mentioned in Ec_specification) to the EC... Greetings, Frieder * Besides the 1 MByte SPI flash the laptop also has 1 GByte SLC Nand flash, (and an SD-card slot and USB slots)) |
| Topic | Author | Date |
| One-Laptop-Per-Child uses 8051 core, OpenEC | 01/01/70 00:00 | |
| This is NOT an 8051-based laptop! | 01/01/70 00:00 | |
| what's the role of the EC in the laptop? | 01/01/70 00:00 | |
| Reference | 01/01/70 00:00 | |
the Embedded Controler is always powered and | 01/01/70 00:00 |