Embedded controller/lang-es

From OLPC
Jump to navigation Jump to search
  Esta página está supervisada por el equipo de OLPC.
  Traducción de Embedded controller original  
  english | español | 한국어   +/- cambios  

Introdución

The XO laptop uses a small micro-controller, an ENE KB3700 (Datasheet), to control the battery charging operation and perform other tasks associated with starting and stopping the laptop.

This Embedded Controller (EC) consists of a 8051 micro-controller, a dedicated LPC interface to communicate with the processor, and an SPI Flash ROM interface. The SPI Flash ROM supports two code segments, and a table of Manufacturing Data. The EC supports the Boot Hub Protocol, allowing the XO's main processor to boot from one of the code segments in the SPI Flash.

El laptop XO usa un microcontrolador pequeño, un ENE KB3700 (Datasheet) para controlar la operación de cargar la bateria y hacer otras tareas associadas con arrancando y apagando la maquina.

Este Controlador Incrustado (EC) consiste de un microcontrolador 8051, un interfacio LPC dedicado a comunicacion con el procesor, y un interfacio a un Flash ROM de typo SPI (interfacio serie). El Flash ROM SPI contiene dos segmentos de código, y una mesa de Informacion de Fabricacion. El EC soporte el Boot Hub Protocol, permitiendo el procesor central del XO a arrancar de uno de los segmentos de código adentro del Flash ROM SPI.

Detallas

The EC, implemented as a KB3700, has a paramount importance in controlling the XO when the CPU is not active. To do so, the KB3700 communicates with the CPU via the EC protocol over a physical LPC interface. For more information, see the Ec specification.

The KB3700 also communicates with the Maxim DS2756 battery fuel gauge IC within the battery pack, via the 1-wire Dallas protocol. DS2756 data sheet.

ec-status

One can deduce part of the internal state of the EC using ec-dump.fth under OpenFirmware. Running the ec-dump script gives us valuable data about internals of the EC, being the EC Register Settings.

The procedure to run ec-dump over internet in a wireless connection is:

ok wifi media lab 802.11 *change it to your name AP
ok fl http:\\18.85.2.147\~joel\ec-dump.fth *change to your AP IP direction

Running ec-dump over internet and saving the file in a USB key:

ok wifi media lab 802.11 *change it to your name AP
ok fload http:\\18.85.2.147\~rafael\to-file.fth
ok to-file u:\ec-dump fload http:\\18.85.2.147\~joel\ec-dump.fth

Proyecto OpenEC

The firmware running on the XO's EC, while heavily modified and supported by OLPC, was originally written by two different companies. OLPC has had no success convincing those companies to open source their code.

The OLPC community is now working on OpenEC, an Open Source implementation of the XO's Embedded Controller firmware. It currently is in an early stage and not functional yet.

El firmware corriendo en el Controlador Incrustado del XO, mientras modificada y apoyada por OLPC, fue escrito originalmente por dos empresas diferentes. OLPC no ha tenido éxito convencer a las empresas a abrir su código fuente.

La comunidad de la OLPC está trabajando en OpenEC, una aplicación de código abierto para el Controlador Incrustado del XO. En la actualidad se encuentra en una etapa temprana y aún no funcional.

Documentacion Relacionada