XO4 Bringup
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This page lists goals and plans for initial bringup of the XO 4 A1 motherboard, the first prototype of the XO-4 Laptop.
Status
Note that a check in any one of the two columns is generally sufficient to prove that the hardware works.
| Subsystem | OFW | Linux | Notes/Reference |
|---|---|---|---|
| CPU Boot | X | ||
| Serial port | X | ||
| Host/EC communications | X | XO_1.75_HOST_to_EC_Protocol | |
| Host/EC programming | X | ||
| PS/2 KB & Touchpad | X | ||
| USB | X | ||
| SD (Int/Ext) | X | ||
| eMMC | X | ||
| DCON/Display | X | ||
| Audio playback (Int/Ext) | X | ||
| Audio recording (Int/Ext) | |||
| SDIO WLAN | X | ||
| Battery charging | X | ||
| Touchscreen | |||
| OFW SPI Flash Prog. | X | ||
| Camera | X |
Goals
The goal of a A-phase board bring-up is get a small number of boards to an acceptable state of functionality. At this point, a larger number of boards are modified to match and distributed for both extended testing of basic functionality (esp. memory stability) and development of software to access further functionality.
The following are the goals of this bringup:
- EC code booting and controlling the power sequencing properly
- CPU booting OFW
- Reliable memory and internal SD operation from OFW
- Reliable use of USB ports from OFW
- Support for the display and keyboard from OFW and Linux
- Support for reprogramming the EC SPI Flash from CPU
Non-goals
We can go home even if these aren't working
- Proper operation of audio interface
- Proper operation of the wireless LAN
- Camera
- Linux
Personnel
- Wad (EE), Gary Chiang (EE), Richard (EC/OFW), Mitch (OFW), Paul (EC/Linux), from OLPC
- Mars (PM), Eddie (PM), Beckham Chen (EE), from Quanta R&D