XO 4 B1: Difference between revisions

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* Seven bumps (arranged in two rows) on the Hinge Cover, identical to the XO-1.75 [[Image:XO-1.75_Hinge_Cover.jpg|thumb|right|XO-1.75 Hinge Cover]]
* Seven bumps (arranged in two rows) on the Hinge Cover, identical to the XO-1.75 [[Image:XO-1.75_Hinge_Cover.jpg|thumb|right|XO-1.75 Hinge Cover]]
* The display has a bezel which doesn't have any texture (it is slick), and it is 1mm deeper than earlier XO laptops.
* The display has a bezel which doesn't have any texture (it is slick), and it is 1mm deeper than earlier XO laptops.
* The touchscreen light guide is clear. In production units, this will be tinted and appear deep purple/black.
* Rev. C motherboard
* Rev. C motherboard



Revision as of 08:52, 22 September 2012

  This page is monitored by the OLPC team.

XO-4 Laptop Beta test model, also known as B-test or B1.

Description

The B1 was the first complete prototype of the XO-4. The B1 bring up happened in the middle of September, 2012. XO-4 B1 units all have prototype multi-touch touchscreens using touchscreen technology from Neonode.

Identification

  • Seven bumps (arranged in two rows) on the Hinge Cover, identical to the XO-1.75
    XO-1.75 Hinge Cover
  • The display has a bezel which doesn't have any texture (it is slick), and it is 1mm deeper than earlier XO laptops.
  • The touchscreen light guide is clear. In production units, this will be tinted and appear deep purple/black.
  • Rev. C motherboard

B1 laptops were produced with a variety of keyboards. They are identified in the battery compartment as SKUs 291, 292, 293, or 294.

Photographs:

XO4 A2 mobo annotated bot.png

Actually an A2 motherboard. Changes are minor, however. To be updated soon

Software Support

  • The current EC Firmware release is 7.0.2.01.
  • The current Open Firmware release is Q7B01.
    • The Q7Bxx series of Open Firmware cannot be used with XO-4 A2 motherboards. Starting with B1, the size of OFW is 2MBytes.
    • This will not work on an XO-1, XO-1.5, or XO-1.75. As with XO-1.75, Open Firmware and the EC firmware are separate --- Open Firmware contains a recent version of the EC firmware and will automatically update an older version given two sources of power, but a more recent version may actually be programmed into the EC.
  • The current Linux image is 13.1.0 build 22.

It is strongly recommended that you have two sources of power (a charged battery and an external power source) when you upgrade your EC or OpenFirmware. Failure to do so may require the use of an SPI programmer to recover your laptop.

Upgrading the EC code

Using OpenFirmware and WiFi

  • requires Q7B01 or later
ok wifi name
ok flash-ec http:\\dev.laptop.org\pub\ec\cl4-7_0_2_01.img
Reading http:\\dev.laptop.org\pub\ec\cl4-7_0_2_01.img
Scan for: name found
Associate with: name 
DHCP got 10.0.0.170 
EC firmware verison: XO-EC 7 0.2.01
Erasing ...

Writing ...
fff0 
Verifying ...
fff0

Board powers down at this point due to EC restart. Power up manually.

Using OpenFirmware

  • requires Q7B01 or later

Place the EC firmware on a USB key and type:

ok flash-ec u:firmware-name
EC firmware verison: XO-EC 7 0.2.01
Erasing ...

Writing ...
fff0 
Verifying ...
fff0

Board powers down at this point due to EC restart. Power up manually.

Upgrading OFW

Place a recent release of the Q7XYY firmware onto an SD device, and place it in the external SD slot.

Interrupt the OFW boot process by pressing the ESC key.

Type (assuming a q7b02 release):

 flash ext:\q7b02.rom

Reboot by holding down the power button once this is completed.

See SPI Flash Recovery using JTAG if necessary.

Upgrading Linux

Installing from OpenFirmware

You will need the .zd version of the OS image. Download it, then:

  1. Place the image on a USB stick, and insert it into the XO-4 laptop's external SD slot.
  2. Get the Ok prompt,
  3. Install onto the internal SD card, type:
fs-update u:os1.zd

Installing from Linux using an XO-1.75

To install on an XO-1.75, boot an XO-1.75 to Linux, insert the SD card in the XO-1.75 external slot, then:

zcat os1.img.gz > /dev/mmcblk1

... and then power down, remove the SD card, and insert in the XO-4.

Installing from OpenFirmware using an XO-1.75

You will need the .zd version of the OS image. Download it, then:

  1. Place the image on a USB stick, and insert it into the XO-1.75 laptop's USB port.
  2. Get the Ok prompt,

To install an image onto the external SD card, you need to type:

devalias fsdisk ext:0
fs-update u:\os1.zd

... and then power down, remove the SD card, and insert it in the XO-4.

Setting the Date

The simplest way to set the date after replacing/changing the RTC battery is boot into Open Firmware and type:

wifi <your_essid>
ntp-set-clock

Restrictions

There is a list of recommended modifications (ECOs).

We recommend that B1 motherboards use a heat spreader.

Documentation

Supporting documentation for these boards (all in PDF):

Please note that production boards will likely have different pin mappings and connector locations.

See also:

Followed by

Preceded by

Changes