Transcript
Page 1: One Laptop Per Child - BSDCan Laptop Per Child BSDCan May 2007 Andrew Clunis

One Laptop Per Chi ld

BSDCan

May 2007

Andrew Clunis<[email protected]>

Page 2: One Laptop Per Child - BSDCan Laptop Per Child BSDCan May 2007 Andrew Clunis

“It's an education project, not a laptop project.”

- Nicholas Negroponte

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Why?

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High-quality education is key to growing a healthy society.

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An inexpensive laptop computer for every child in the world is a good way

of doing it.

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<picture of pilot project in Africa goes here>

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Children learn by doing.

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Collaboration is paramount.

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It needs to be malleable; not like the immutable systems that we have been trained to “consume” in the Western

world.

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It must depend on as little infrastructure as possible.

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Goals

● high-quality education for everyone is essential for a healthy society

● a inexpensive laptop for every child in the world

● learning by doing (“constructionism”)● malleable● infrastructure not always available● child-to-child collaboration and

communication

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Learn ing Learn ing

● children learn by doing● constructionism (a variant of

constructivism)● “'Edutainment'? No thanks. I prefer

Playful Learning.”● use the laptop as a tool to create things,

not for doing “busy work”● ideas pioneered by folks like Seymour

Papert and Alan Kay

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Mult i -T iered Content Creat ion is Bad

● computers should not merely be “delivery systems” for the “content providers”

● more balanced creation to consumption ratio

● kids shouldn't be forced to use watered-down tools

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Appropr iate to Appropr iate

● all OLPC code is Free Software

● transparency is empowering

● much of the user environment and activity code is Python, thus making it editable without use of compilers or toolchains, right there on the laptop

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Col laborat ion

● all Activities shareable on the mesh● live sharing (think Writely)● instantly get voice, video, and text chat

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Economics

● “Scale vs Pilot”● millions of machines, not thousands● when you make that many devices, you

can have custom pieces made (ASICs, etc.)

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Hardware

● 466 MHz AMD Geode LX-700● 256 MiB of RAM● 1 GiB of Flash NVRAM (compressed to

give about ~2 GiB with jffs2)● speciality LCD display● speciality “CaFE” ASIC, for better NAND

access, plus 'bonus' camera and SD● no moving parts!

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LCD disp lay

● much less expensive than conventional LCDs ($35 target)

● hybrid reflective and transmissive modes● outdoors!● 1200x900 addressable resolution, 200

DPI● colour mode effective 800x600, full

1200x900 (200 dpi) in monochrome mode

● LED backlight rather than mercury lamp

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Reflective Monochrome Transmissive Colour

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Power Requirements

● grid infrastructure often not available in developing nations

● human power● traditional laptop uses more than 25

watts● OLPC needs to be less than 2.5 watts (a

whole order of magnitude!)

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Where's the crank?!

● crank now an optional separate module● some locales might not require the crank● onboard crank tends to torque laptop too

much● more versatile, things like “gang

charging” or a PV array on the roof of a schoolhouse are now possible

● Kofi Annan broke it

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Crank

● either FreePlay or similar● not actually a crank, because cranks only

use weak arm muscles● either pull cord (shoulder) or pedal (legs)● small child can only produce about 5 to

10 watts● 10:1 minimum usage to cranking ratio

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Power Management

● laptop enters suspend-to-RAM state during periods of inactivity

● very aggressive● DCON chip contains small piece of RAM

that (more or less) fits the entire framebuffer, so CPU can be suspended with display still on

● always maintaining mesh network for others, even while suspended

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Environmental Impact

● ROHS compliant● no mercury in display● will not poison water table when

discarded

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Can't f ind a network? Make one instead!

● IEEE 802.11s extensions to standard 802.11g

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Threats

● Gee, a whole bunch of always-on Internet-connected laptops in the hands of small children?

● mmm, botnets and spam pharms just waiting to happen

● thieves and black market● corruption and graft● however, security system must impose on

personal freedom as little as possible

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Hardware Secur i ty

● laptop taken away from its home network ceases to function after set amount of time

● “trusted” firmware and boot path makes it very difficult to defeat without opening laptop and reflashing ROMs

● “modchip” theoretically possible, but unfeasible for common thieves

● identifiable colours

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Software Secur i ty : “Bi t f rost”

● traditional “programs run as me” security model no good

● activities run with minimal rights● very granular rights system, including

CPU scheduling!● no passwords● all activities run in linux-vserver sandbox,

an in-kernel thin 'virtualisation':no CPU overhead, ~32 KiB per process overhead

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Software

● entirely Free Software● OpenFirmware● Linux 2.6.2x● Xorg● Gecko 1.9● OLPC-specific Sugar user environment

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Sugar

● applications are “Activities”● shell written in Python● discards “desktop metaphor” in favour of

“zoom metaphor”● Python requires no “toolchains”.● Python is “semantic”; there is no

intermediary compiled “presentation” format.

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Act iv i t ies

● collaborative● discrete “bundles” that are easily

shareable with others● can't join an activity on the mesh

because you haven't got it? It will be downloaded from the group automatically.

● Written in Python● Speciality widget classes in Sugar that

derive from Hippo and GTK+

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Communicat ion Manager

● Collabora Inc.● provides the low level constructs for

implementing collaboration in Activities● integrated with Telepathy● servers are an optimisation only (XMPP)● runs as dbus service● handles pipe reliability ● really is a series of tubes

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Act iv i t ies

● Write● Draw● TamTam● Develop● eToys● Web● News Reader● Block Party

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Develop act iv i ty

● a Python “IDE”● both live collaboration and...● ... distributed version control● code localisation (maybe)

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Summary

● laptop computer for children in developing nations

● inexpensive, safe, reliable● creation as important as consumption● Free Software● malleable system; kids can play and

change things

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Quest ions?

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Bibl iography

● OLPC wiki (http://wiki.laptop.org/)● “Edutainment? No thanks, I prefer Playful

Learning”, Mitchel Resnick● “Making Sausage: How the OLPC machine

was designed”, Jim Gettys


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