XO4 Bringup
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This page listed goals and plans for initial bringup of the XO 4 A1 motherboard, the first prototype of the XO-4 Laptop, and now lists ongoing work.
Status
Note that a check in any one of the two columns is generally sufficient to prove that the hardware works.
| Subsystem | OFW | Linux | Kernel maintainer | Notes/Reference |
|---|---|---|---|---|
| CPU Boot | X | X | NA | |
| Serial port | X | X | NA | #12045 still open |
| Host/EC communications | X | X | dilinger / pgf | XO_1.75_HOST_to_EC_Protocol |
| Host/EC programming | X | NA | NA | |
| Keyboard | X | pgf | ||
| Touchpad | X | pgf | ||
| USB | X | cjb | ||
| SD (Int/Ext) | X | X | cjb | Ext SD cards are being detected read-only by Linux in some machines |
| eMMC | X | X | cjb | |
| DCON | X | cjb | ||
| Framebuffer display | X | jnettlet | ||
| Xorg | NA | jnettlet | ||
| Audio playback (Int/Ext) | X | saadia | ||
| Audio recording (Int/Ext) | saadia | |||
| SDIO WLAN - libertas | X | X | cjb | |
| SDIO WLAN - mwifiex | shep | |||
| Battery charging | X | NA | NA | |
| Touchscreen | pgf | unit tested in both OFW/Linux, waiting for new IR pcb assemblies | ||
| OFW SPI Flash Prog. | X | NA | NA | |
| Camera | X | jnettlet | ||
| SMP | NA | dilinger | ||
| Battery driver | X | X | pgf | |
| OLS | saadia | |||
| Switches (ebook, lid) | X | pgf | ||
| Internal RTC | saadia | |||
| External RTC | saadia | |||
| Accelerometer | saadia | |||
| Suspend/resume | dilinger | |||
| CPU frequency changing |
A1 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
A1 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
A1 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