XO 1.5 C3: Difference between revisions
(Created page with '{{OLPC}} XO-1.5 Laptop model C3. == Description == The C3 is the XO-1.5 (CL1B) version in production. == Identification == Externally identical to X…') |
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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 [[Media:XO_1.5_Pinouts_C2.pdf|pinout]] and the [[Media:XO_1.5_Connectors_C1.pdf|connector/jumper locations]]), but its use must be enabled using a jumper or properly wired serial adapter, present at boot. |
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 [[Media:XO_1.5_Pinouts_C2.pdf|pinout]] and the [[Media:XO_1.5_Connectors_C1.pdf|connector/jumper locations]]), but its use must be enabled using a jumper or properly wired serial adapter, present at boot. |
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The new serial adapters for XO-1.5 laptops automatically enable the serial port when connected at boot. They do this by tying pin 1 to GND (pin 4) through a 1K resistor. |
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| ⚫ | Serial adapters used with XO-1 will work with XO-1.5, but you will have to manually enable the serial port. To do this, you will have to either short pins 1 and 3 on the SERIAL ENABLE jumper (JP1) or short PR148. JP1 is located right behind the processor serial port. Pins 1 and 3 are the two pins closest to the memory chips. PR148 is a large power resistor located near the processor serial port (see the [[Media:XO_1.5_Connectors_C1.pdf|XO-1.5 connector locations]]). You can use a pencil, rubbed repeatedly across PR148, to enable the serial port. An eraser can be used to disable the port. [[Image:XO_1.5_PowerDomains_C2.png|thumbnail|Power Distribution]] |
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| ⚫ | 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 |
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[[Image:XO_1.5_PowerDomains_C2.png|thumbnail|Power Distribution]] |
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If the SERIAL_ENABLE jumper is set, the camera in-use LED will remain lit. This will not be fixed ([http://dev.laptop.org/ticket/9385 Trac ticket #9385]). |
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==Software Limitations== |
==Software Limitations== |
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Revision as of 06:05, 8 May 2010
XO-1.5 Laptop model C3.
Description
The C3 is the XO-1.5 (CL1B) version in production.
Identification
Externally identical to XO-1 w. capacitive (single) touchpad, except for three raised dots on each side of the hinge cover:
Internally:
- Motherboard revision G
- The WLAN is on a removable daughtercard
- Some XO-1.5 have all eight memory chips populated (1 GiB), and some have only four memory chips populated (512 MiB).
Software Support
Firmware
XO-1.5 use Q3xxx firmware releases. These will not work on an XO-1.
If you upgrade the Linux distribution on a laptop, it contains a recent version of firmware which will be automatically installed on the next reboot when both DC power and a battery are present.
Obtaining Firmware
C2 motherboards require a release equal to or later than Q3A26. We currently suggest using Q3A35.
Check the XO 1.5 EC dev changelog for information about the latest EC firmware (integrated into the above OFW releases).
Installing Firmware
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.
The new serial adapters for XO-1.5 laptops automatically enable the serial port when connected at boot. They do this by tying pin 1 to GND (pin 4) through a 1K resistor.
Serial adapters used with XO-1 will work with XO-1.5, but you will have to manually enable the serial port. To do this, you will have to either short pins 1 and 3 on the SERIAL ENABLE jumper (JP1) or short PR148. JP1 is located right behind the processor serial port. Pins 1 and 3 are the two pins closest to the memory chips. PR148 is a large power resistor located near the processor serial port (see the XO-1.5 connector locations). You can use a pencil, rubbed repeatedly across PR148, to enable the serial port. An eraser can be used to disable the port.
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 --- thus disabling power to the camera.
If the SERIAL_ENABLE jumper is set, the camera in-use LED will remain lit. This will not be fixed (Trac ticket #9385).
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 at this time