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.

Bringup status
Subsystem OFW Linux Kernel maintainer Notes/Reference
CPU Boot X X
Serial port X X #12045 still open
Host/EC communications X dilinger / pgf XO_1.75_HOST_to_EC_Protocol
Host/EC programming X 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 X X cjb
Battery charging X NA
Touchscreen pgf
OFW SPI Flash Prog. X NA
Camera X jnettlet
SMP NA dilinger
Battery driver X pgf
OLS saadia
Switches (ebook, lid) pgf
Internal RTC saadia
External RTC saadia
Accelerometer saadia
Suspend/resume dilinger
CPU frequency changing

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