XO 1.5 C2

  This page is monitored by the OLPC team.

XO-1.5 Laptop C test model 2 (C-Test 2), also known as C2.

Description

The C2 prototypes are complete systems, externally identical to production XO-1s (CL1A). This is the XO-1.5 (CL1B) version that will enter production.

Identification

Externally identical to XO-1 w. capacitive (single) touchpad, except for three raised dots on each side of the hinge cover:

• Motherboard revision G
• WLAN daughtercard
• Some have all eight memory chips populated (1 GB) and some have only four of eight memory chips populated (512 MB).

Motherboard

Software Support

Firmware

XO-1.5 use Q3xxx firmware releases. These will not work on an XO-1.

Obtaining Firmware

C2 motherboards require a release equal to or later than Q3A26. We currently suggest using Q3A26.

Check the XO 1.5 EC dev changelog for information about the latest EC firmware (integrated into the above OFW releases).

See the firmware upgrade instructions for a B2 unit.

Linux

See Linux download and installation instructions for a B2.

Hardware Limitations

The currently known hardware limitations are:

Serial Port

The processor serial port situation on XO-1.5 is not optimal, as it shares pins with the camera interface. There is a connector (J4) located on the upper left hand side of the motherboard for +3.3V RS-232 connection (see the pinout and the connector/jumper locations), but its use must be enabled using a jumper or properly wired serial adapter, present at boot.

To use the serial port you will have to either short PR148, short pins 1 and 3 on the SERIAL ENABLE jumper (JP1), or use a serial adapter which has pin 1 tied to GND (pin 4) through a 1K resistor. PR148 is a large power resistor located near the processor serial port (see the XO-1.5 connector locations). JP1 is located right behind the processor serial port. Pins 1 and 3 are the two pins closest to the memory chips.

There is no need to disconnect the camera in order to use the serial port. Any use of the camera while the serial port is enabled will generate constant spurious serial data. To fix this, the Linux camera driver will not load if the serial port is enabled. If the SERIAL_ENABLE jumper is set, the camera in-use LED will remain lit. This will not be fixed (Trac ticket #9385).

SPI Flash location

Power Distribution

Software Limitations

(Below list auto-sourced from F11_for_1.5/Known_Issues)

(obsolete reference, see release notes).

Documentation

Supporting documentation for these boards are (in PDF):

• Pinouts
• Connector Locations
• GPIO Mappings
• EC Pinout
• EC Power On Sequence
• Power Distribution Diagram (PDF)
• Motherboard Photos

Followed by

• Nothing right now.

Preceded by

• C1