path: root/2008/openmoko-bossa2008/openmoko-tech.mgp

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OpenMoko
Building a truly hackable device


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by

Harald Welte <laforge@openmoko.org>

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OpenMoko
Introduction

Who is speaking to you?

		an independent Free Software developer, consultant and trainer
		who is a member of the free software community for 10 years
		who has worked a lot on the Linux kernel
		who had originally started OpenEZX for Motorola phones
		and who's been lead hardware + system software architect for OpenMoko until recently

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OpenMoko
WARNING

While I have been the Lead System Architect for hardware and system level software, throughout the first 16 months of the project,

I have quit working for OpenMoko, Inc. or the FIC group in November 2007.

Thus, I do not officially represent either of these entities!


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OpenMoko
What is OpenMoko

The commercial side

	First International Computer, Inc.
		A large Taiwanese hardware vendor
		Has a FIC Mobility business unit
		Hardware R&D and production of Neo1973 GTA01 and GTA02 handsets


	OpenMoko, Inc., ("OpenMoko, the Company")
		Part of First International Computer (FIC) Group
		Funding the OpenMoko software R&D
		Responsible for product definitil, sales, marketing, PR, ...


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OpenMoko
What is OpenMoko

The community side
	OpenMoko, the overall Free Software project
		A FOSS project working on
			OpenMoko kernel/u-boot patches (hardware support)
			OpenMoko GNU/Linux distribution
			OpenMoko UI / framework
		Funded by OpenMoko, Inc.

	OpenMoko, the embedded GNU/Linux distribution
		An OE-built embedded GNU/Linux distribution for mobile communications devices
		Primarily targetted at OpenMoko/FIC handsets
		Is being ported to other devices by the community
		Maintained by OE coreteam member employed by OpenMoko, Inc.

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OpenMoko
What is OpenMoko about?

	Open
		Opening up the formerly-closed mobile world
		on any achievable level

	Mobile
		Mobile devices are the future

	Free
		100% Free Software from driver through UI

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OpenMoko
What is OpenMoko about?

	FIC provides
		experience in mass production of consumer electronics
		experience in production of GSM handsets
		experience in hardware development of GSM handsets

	OpenMoko provides
		good contacts within the FOSS communities
		strong technical knowledge on GNU/Linux
		software development

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OpenMoko
Neo1973 GTA01 hardware

Neo1973 GTA01 hardware (07/2007)
		S3C2410 SoC @ 266MHz
		2.8" 480x640 LCM, 262k colors
		128MB SDRAM
		64MB SLC NAND (512/16k)
		USB 1.1 device and host (unpowered)
		A-GPS (without processor)
		GSM+GPRS chipset (ARM7 based)
		Wolfson audio codec
		2 stereo speakers (1.2W)
		2.5mm headset jack
		CSR4 based Bluetooth
		NXP PCF50606 power management unit

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OpenMoko
Application Processor

Closer look at Application Processor
	SC2410 SoC @ 266MHz
		three UART's
		133MHz SDRAM interface
		66MHz external bus
		Two channels SPI
		IIS
		I2C
		SDIO
		TFT controller
		NAND controller

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OpenMoko
Neo1973 GTA02 hardware

Neo1973 GTA02 hardware ("soon")
		S3C2442B SoC @ 400 MHz (500MHz option)
		2.8" 480x640 LCM, 262k colors
		128MB SDRAM
		256MB SLC NAND (2048/128k)
		USB 1.1 device and host (with power)
		A-GPS (fully autonomous firmware-based)
		GSM+GPRS chipset (Ti Calypso, ARM7 based)
		CSR4 based Bluetooth
		Atheros AR6k based 802.11b/g WiFi
		2 3D accelerometers
		Smedia Glamo 3362 GPU
		NXP PCF50633 power management unit

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OpenMoko
GTA02: Smedia Glamo GPU

Smedia Glamo 3362 GPU
		8MB internal SDRAM
		16bit local bus interface to S3C2410
		2D acceleration
		3D acceleration
		H.263 codec (encode/decode)
		LCM controller
		SD-Card controller
		hardware JPEG encoder/decoder
		Camera interface and imapge processing (unused)

OpenMoko is writing 100% FOSS drivers (GPL/MIT licensed)
		kernel driver for core and framebuffer
		Xglamofb accelerated X server

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OpenMoko
GSM Modem

Closer look at the GSM Modem
	Ti Calypso/Iota based chipset
	As proprietary as any other phone
		runs proprietary nucleus OS
		runs proprietary GSM stack
	Supports GSM voice/data/fax and GPRS
	Tri-Band GSM
	Very good TS 07.05 / 07.07 / 07.10 compliance
		eveyone can download the protocol docs from ETSI.org
		no user/hacker needs access to NDA'd documents

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OpenMoko
Free Software stack

Free Software stack
	bootloader: u-boot current git (post-1.3)
	kernel: linux 2.6.24 based
	xserver: kdrive
	glibc
	glib
	gtk+
	pulseaudio
	gsmd / libgsmd

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OpenMoko
Development Model

Development Model
	"do embedded GNU/Linux the right way"
		use and track current mainline code
		actively contribute our code upstream
		all code is immediately committed to public svn repository
		development discussions happen on public mailinglists
		all code developed by OpenMoko is FOSS licensed
		everyone can contribute
		no copyright assignments to OpenMoko

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OpenMoko
Build System

	We build
		an embedded Linux distribution
		split in ipk packages (just like dpkg/rpm)
		ipk feeds (just like apt-get/yum)

	We release
		full source code in svn
		all patches to all packages
		the entire build system (built with OE)

	Our build system is public
		Everyone can rebuild everything
			cross-toolchain
			u-boot / kernel image
			application/library packages

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OpenMoko
Hackable Device

Hackable Device
	Standards compliance wherever possible
	The device shall be under full user control
	Everyone should be able to hack it, at any level
	Make entry barrier for development as easy as possible
	bootloader prompt via USB serial emulation
	Serial console
	JTAG for the people
	Provide Debug Board with embedded USB JTAG + serial adapter


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OpenMoko
Standards compliance

Standards compliance
	We use open/documented/available standards wherever possible
	Use official USB device firmware upgrade protocol
	Have charger behave 100% to USB spec (100/500mA)
	Use GSM chipset that follows GSM 07.07/07.10 closely

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OpenMoko
User control

User control
	The phone needs to be under control of the user, and the free software he uses
	Even backdoors or rogue GSM firmware shall not be able to intrude the privacy fo the user
	So we e.g. put the Audio codec (under explicit control from the Linux-running AP) between microphone/speaker and the GSM modem
	So we enable the Linux-running AP to cut power of the GSM modem
	Thus, free software (and thus the user) remains in ultimate control


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OpenMoko
Hackable at any level

Hardware Hacking
	we even encourage hardware hacking
	I2C, SPI, GPIO and IRQ line on documented test pads and connector
	allows for attachment of new peripherals to the device
	even the hardware schematics available under FOSS-permissive NDA

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OpenMoko
Hackable at any level

System-level hacking (bootloader, OS)
	entire bootloader from very first instruction FOSS
	entire kernel including all drivers FOSS
	JTAG accessible on debug connector
	serial console on debug connector
	debug board (USB JTAG adaptor and USB serial converter)
	un-brickable through emergency boot loader in read-only NOR flash (GTA02)
	DFU (Device Firmware Upgrade) for full-system re-flash via USB

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OpenMoko
Hackable at any level

Userspace and UI level hacking
	entire userspace world FOSS (libraries, daemons, UI, X driver, ...)
	FOSS build system and toolchain/SDK enable anyone to build custom softwar packages and/or flash images
	provide a programming environment as close as possible to the Linux desktop world
	allow developers to re-use their existing Linux development skills

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OpenMoko
GSM Integration

Application Processor GSM integration
	kernel line discipline implementation for GSM 07.10
	userspace GSM daemon with unix domain socket
	libgsmd with API for applications
	kernel part intended for mainline submission
	will support different phones / gsm chipsets
		Various HTC devices with Linux
		Motorola EZX phones using OpenEZX


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OpenMoko
GSM Integration

But you can't hack the GSM stack
	yes, that is true.
	pretty much like you can't hack the firmware of your SCSI or RAID controller, WiFi card, Bluetooth chipset, etc.
	even the firmware of a good old analogue phone line (voice) modem was not hackable
	having proprietary firmware on a dedicated peripheral CPU is even acceptable to the FSF!
	And no doubt, anyone inside OpenMoko would love to ever have a open source GSM stack.  Patches welcome :)

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OpenMoko
GSM Integration

But you can't hack the GSM stack
	so you get the maximum level of freedom that you can get with any other peripheral device:
		open source low-level (mux, power mgmt) drivers
		open source high-level drivers (gsm daemon)
		openly documented serial protocol (TS 07.05, 07.07, 07.10)
	asking for more freedom on the GSM side is hypocritical when accepting the very same level with other peripheral devices.

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OpenMoko
GSM Integration

But you can't hack the GSM stack
	besides that
		GTA01 has baseband JTAG on test pins
		OpenMoko does not cryptographically sign GSM firmware images
		GSM firmware is user-upgradable

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OpenMoko
Difference

Difference from other Linux phones
		'others' discourage third parties from writing apps
			you need explicit permission? WTF!
		'others' try to make customers pay for a device that's still under manufacturer / GSM operator control
		'others' use proprietary kernel modules
			locks you into some old kernel version
		'others' use proprietary bootloaders
		'others' dont give you JTAG/serial access
		'others' use proprietary UI toolkits
			vendor lock-in
		'others' dont give out their build system
		'others' dont give out their firmware update tools



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OpenMoko
Neo1973 GTA01 Emulator

The Neo1973 GTA01 emulator
		based on populer qemu project
		full GTA01 hardware emulation, including
			NAND controller
			LCM controller
			power management unit
			GSM modem
			touchscreen controller
			SD card controller
			...
		you can run the exact same bootloader/kernel/rootfs images
		thus, no need to buy real hardware to start hacking
		e.g. NetBSD port has been done entirely on emulator!
		http://wiki.openmoko.org/wiki/OpenMoko_under_QEMU


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OpenMoko
How to contribute


	First: get hands-on experience 
		with emulator (free, based on qemu, full GTA01 emulation)
		with real hardware (GTA01 now, GTA02 soon)
	follow instructions on the wiki, improve it with your feedback
	start local user / developer groups
	go through bugzilla, look for bugs in your favourite components
		try to reproduce bug with current images
		provide feedback
		help by proividing additional debugging information

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OpenMoko
How to contribute


	write your own gtk+/e17 applications fit for 480x640 screen size and limited CPU
		do development on your host pc (native)
		then cross-compile for OpenMoko
		then test on emulator or hardware
		then build and package with OE
	go through projects.openmoko.org and contact project teams, help them out
	hang out on mailinglists and #openmoko on freenode.net
		start sharing your experience with others with your experience

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OpenMoko
Online Resources


		http://www.openmoko.org/
			portal site, just links everywhere else
		http://wiki.openmoko.org/
			everything you (n)ever wanted to know about openmoko ;)
		http://bugzilla.openmoko.org/
			documents all known bugs, please add/report and debug!
		http://lists.openmoko.org/
			various mailing lists for Q&A and discussions
		http://planet.openmoko.org/
			planet aggregating RSS feeds of various blogs
		irc.freenode.net #openmoko
			lots of developers hanging out there
		https://direct.openmoko.com/
			for buying actual hardware