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authorHarald Welte <laforge@gnumonks.org>2015-10-25 21:00:20 +0100
committerHarald Welte <laforge@gnumonks.org>2015-10-25 21:00:20 +0100
commitfca59bea770346cf1c1f9b0e00cb48a61b44a8f3 (patch)
treea2011270df48d3501892ac1a56015c8be57e8a7d /2006/phneutral-a780
import of old now defunct presentation slides svn repo
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+* Title:
+ Towards the first 100% free software GSM phone
+
+* Subtitle:
+ Reverse Engineering the Motorola EZX (A768,A780,E680) series of Linux-based GSM phones
+
+* Abstract:
+ This presentation describes the progress of hacking and extending the
+ Motorola series of Linux based Smartphones, with the ultimate goal to
+ replace all proprietary applications with 100% free software.
+
+* Description:
+ A longer and detailed description of the event's content (250 to 500 words)
+ It's been two years since Motorola has released the first Linux
+ Smartphone (A768). More recently, two new models were introduced, the
+ A780 and the E680, the former even officially distributed in Germany
+ and all over the EU.
+
+ What's so special about a Linux based smartphone? It's special because
+ the Linux kernel acts as an enabler for 3rd party hacks and 3rd party
+ software, like it can be observed with the OpenWRT, OpenTom,
+ NSLU2-Linux, OpenEmbedded, OpenZaurus and other similar projects.
+
+ The author of this presentation has sucessfully obtained "telnet"
+ access to an A780 cellphone, built a matching cross-compilation
+ toolchain and installed various applications for debugging, such as
+ busybox, iptables, nmap, lsof, strace, etc.
+
+ While re-engineering efforts are still in a early stage, work is
+ proceeding extremely fast, and important pieces such as the protocol
+ between the PXA270 frontend processor and the ARM7TDMI GSM processor
+ have already been partially re-engineered. The project is expected to
+ progress significantly until 22C3.
+
+
+* Please state if you are going to submit a paper to be included in the 22C3
+ Proceedings
+ Yes
+
+* Please state if you are going to use slides in your talk and in which format
+ you are going to provide a copy
+ Magicpoint or tpp
+
+* Duration of your talk
+
+* Language of your talk
+ en_US
+
+* Links to background information on the talk
+ http://www.motorolafans.com/
+ http://gnumonks.org/~laforge/weblog/linux/a780/
+ http://svnweb.gnumonks.org/trunk/a780/
+
+* Target Group:
+ Developers
+
+* Resources you need for your talk
+ digital projector
+
+* Related talks at 22C3 you know of
+ none
+
+* A lecture logo, square format, min. 128x128 pixels (optional)
+ none
+
diff --git a/2006/phneutral-a780/openezx.mgp b/2006/phneutral-a780/openezx.mgp
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+%include "default.mgp"
+%default 1 bgrad
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+%nodefault
+%back "blue"
+
+%center
+%size 7
+
+Motorola EZX
+Linux Smartphones
+
+May 28, 2006
+ph-neutral
+
+%center
+%size 4
+by
+
+Harald Welte <laforge@gnumonks.org>
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Introduction
+
+
+Who is speaking to you?
+ an independent Free Software developer
+ who earns his living off Free Software since 1997
+ who is one of the authors of the Linux kernel firewall system called netfilter/iptables
+ who can claim to be the first to have enforced the GNU GPL in court
+ who is doing way too many projects simultaneously, one of them OpenEZX
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Contents
+
+ Disclaimer
+ What is OpenEZX
+ History of Motorola Linux Phones
+ A780 / E680(i) overview
+ Techniques for reverse engineering
+ Current status of information about EZX phones
+ OpenEZX software status
+ Another Linux GSM Phone: HTC BlueAngel
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Disclaimer
+
+
+Disclaimer
+ I have no affiliation with Motorola
+ OpenEZX project has no affiliation with Motorola
+ All Information is based on observation, and may be wrong
+ Lots of the work has been done by a large community, I'm a newbie ;)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+What is OpenEZX
+
+
+ OpenEZX project
+ to document EZX phone hardware and software
+ to provide 100% free software stack for frontend CPU
+ might at some future point in time also look into GSM/RF related hacks
+ Homepage: http://openezx.org/ (http://open-ezx.org)
+ Wiki: http://wiki.openezx.org/
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+History
+
+
+History of Motorola Linux based gsm phones
+ A760, A768
+ Released in Asia in 2003
+ EZX (A780, E680, E680i)
+ E680 sold only in asian market
+ A780 sold in China since August 2004
+ A780 first Motorola Linux phone available in EU/US
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780
+
+
+ The A780 phone
+ Quad-band GSM
+ AGPS
+ GPRS, EDGE, HSCSD
+ Intel Xscale based
+ Monta Vista CE Linux
+ Bluetooth
+ USB device port (modem / mass storage)
+ Transflash slot (SD-card in smaller form factor)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+E680/E680i
+
+
+ The E680 phone
+ Like A780
+ No GPS
+ full-size SD/MMC slot
+ FM Radio
+ minor differences in Audio system, GPIO assignment, ...
+
+ The E680i phone
+ seems to only differ in software
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Other Linux Smartphones
+
+ Other Motorola Linux Smartphones
+ E895
+ A1200
+ A910
+ A732
+ A728
+ ROKR E2
+
+ They all have a similar design, so supporting all of them should be possible
+ Unfortunately I don't really have the money to buy/import all of them :(
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Techniques for re-engineering
+
+
+ learn about the device
+ take the device apart
+ take high-res PCB photographs
+ FCC database sometimes quite helpful
+ remove all the shielding covers
+ write down types of all integrated circuits
+ google for those circuits, try locating data sheets
+ sometimes service manuals can be obtained for small fees
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Techniques for re-engineering
+
+
+ try to find a serial console port
+ successful in many embedded devices
+ all you need is a 3.3v<->RS232 level shifter
+ A780: checking all 100+ test points with an oscilloscope :(
+ unfortunately not successful in the case of A780
+
+ try to find a JTAG port
+ cheap JTAG / parallel port adaptors available or DYI
+ only helps if you also have a BSDL file or similar
+ hard to figure out which of the five pins is which
+ be aware: there might be multiple JTAG ports for multiple IC's
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Techniques for re-engineering
+
+
+ access to the OS instead of the UI
+ serial console helps in many cases, not in this one
+ networked devices sometimes have telnet/ssh available
+ exploits of known-to-be-installed software (zlib-1.1.3)
+ try "weird button combinations" at startup
+
+ access to flash memory
+ read out via JTAG
+ if you have shell access, dd if=/dev/mtd* of=...
+ via vendor-supplied flash programming tool
+ copy / unpack / mount flash image to PC workstation
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Techniques for re-engineering
+
+
+ simulation
+ running ARM binaries from device in QEMU emulation
+ commercial ARM emulators
+
+ disassembling
+ WARNING: may be illegal in most jurisdictions
+ use gnu binutils (objdump, ...)
+ use special-purpose proprietary tools (IDA Pro)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 Hardware
+
+
+ In short
+ A Motorola Neptune LTE based mobile phone plus
+ A PXA270 Xscale based PDA in one case
+
+ Application Processor (PXA270)
+ runs heavily modified linux-2.4.20 kernel
+ 48MB RAM
+ 48MB "wireless" flash
+ software-configurable clock speed up to 400MHz
+ JTAG port on test pads, BSDL file and JFlash available
+ SPI/SSP interface to PCAP and BP
+ directly attached to 320x200 LCD display
+ directly attached to touch screen, buttons
+ directly attached to 1.3Mpixel camera module
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 Hardware
+
+
+ Baseband Processor (Neptune LTE)
+ contains ARM7TDMI for GSM stack
+ contains 566xx DSP for digital baseband
+ JTAG port on test pads, but no BSDL file
+ Connected to Application processor via USB
+ SPI/SSP interface to PCAP and AP
+ UART connected to AGPS processor
+ Connects to GSM SIM module
+ 8MB external flash
+ 2MB external RAM
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 Hardware
+
+
+ AGPS Processor (Motorola Telematics MG4100)
+ Attached to UART of BP
+ Has it's own Flash and RAM (2MB?)
+
+ PCAP2 (power management, clock and audio peripheral)
+ produces a 16 different voltages
+ handles all mono/stereo audio
+ connected to 2 speakers, microphone, vibrator
+ clock generation
+ SPI/SSP interface to AP and BP
+ Backlight control
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 Hardware
+
+
+RF Part (not very much information known)
+
+ RF6003
+ fractional-n RF synthesizer
+
+ RF2722
+ GPRS/EDGE capable receiver (RX)
+
+ RF3144
+ quad-band power amplifier (TX))))
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 AP Software
+
+
+ linux-2.4.20
+ whole bunch of montavista additions
+ dynamic power management
+ EZX arm subarchitecture
+ low-level drivers for
+ SPI/SSP
+ PCAP Audio (mono/stereo/headset/...)
+ Vibrator (/dev/vibrator)
+ USB host port attached to BP
+ USB device port (belcarra usbd, not gadget)
+ Transflash/SD/MMC
+ THREE proprietary flash file systems
+ Intel VFM (hatcreek.o)
+ m-systems DiskOnChip (tffs.o)
+ third unknown
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 AP Software
+
+
+ mux_cli.o
+ hooks into special functions of USB host driver
+ provides GSM TS07.10 (de)multiplex
+ userspace has tty devices
+
+ gprsv.o
+ implements GPRS line discipline for mux_cli ttys
+ hooks into netfilter to intercept DNS packets ?!?
+ provides gprs0 / grps1 network devices
+
+ ipsec.o
+ proprietary ipsec stack (don't we already have two GPL licensed?)
+ Copyright Certicom Corp
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 Software
+
+
+ Libraries
+ glibc
+ Bluetooth
+ proprietary userspace program directly opens HCI
+ GPS
+ no NMEA, no serial device emulation :(
+ proprietary library / lapid via mux_cli kernel module
+ UI
+ embedded Qt
+ Motorola EZX toolkit
+ Java
+ Full J2ME support
+ (but who wants java if there's linux?)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+A780 Software
+
+
+ Apps
+ Opera
+ Helix Player with codecs
+ aac, amr, mp4, realvideo, mid, mp3, mp4, wma
+ movianVPN
+ proprietary IPsec VPN client
+ CoPilot
+ proprietary GPS navigation, map&route program
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX Firmware Images
+
+
+ EZX Firmware Images
+ Motorola ships .SHX firmware images to service centres
+ No legal way for users to get FW updates
+ Proprietary Windows apps flash phone via USB
+ Motorola PST
+ Motorola RSD lite
+ SHX files contain 'code groups'
+ AP bootloader (blob based)
+ AP linux kernel
+ AP root filesystem
+ AP /ezxlocal filesystem
+ AP "language pack"
+ Bootup Logo/Animation
+ BP OS
+ DSP code
+ Cryptographic Signature(s)
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX bootloader
+
+
+ EZX bootloader
+ based on GPL licensed blob
+ source code now finally released by Motorola
+ low-level initialization code (GPIO config, clock, ...)
+ vendor specific USB device that allows for
+ transfer of executable code from USB host
+ execution of transferred executable
+ serial console code is present in binary, but not used :(
+ PST/RSD firmware updates work by uploading a 'ramloader'
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX Firmware Update Process
+
+
+ EZX AP Firmware Update Process
+ Application Processor is put into update mode
+ via two-button combination at bootup
+ via software (writing magic value to start of SDRAM)
+ Application Processor enumerates in firmware update mode
+ Host PC sends executable code (ramldr) to phone memory
+ Host PC sends jump command to make AP execute downloaded code
+ Application Processor re-enumerates as different device
+ Host PC sends content for individual flash partitions into AP RAM
+ AP ramldr code flashes partitions
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX Firmware Update Process
+
+
+ EZX BP Firmware Update Process
+ Application Processor is put into "pass-through mode"
+ via boot loader by fiddling with HCD/OTG/UDC/GPIO regs
+ Host PC is directly attached to Basband Processor
+ Host PC downloads executable code (BP ramldr) to phone memory
+ BP verifies cryptographic signature (RSA 1024?)
+ BP executes BP ramldr
+ Host PC sends content for flash partitions into BP RAM
+ BP ramldr code flashes partitions
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX Firmware Update Process
+
+
+ EZX AGPS Firmware Update Process
+ AGPS attached to UART of BP
+ BP can update AGPS ARM7 firmware via UART
+ Protocol unknown
+
+ EZX Bluetooth Firmware Update Process
+ Broadcom bcm2305 connected to AP UART
+ It can be updated via UART, too
+ Linux kernel driver can only update it via USB, not UART
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX USB (EMU)
+
+
+ EZX phones seem to have USB device port
+ Actually, it's "Enhanced Mini USB" (EMU)
+ Depending on pullup/pulldown/... resistors
+ USB device port
+ Serial port (RS232 at 3.3V levels)
+ Stereo audio signal
+ 500mA charger
+ Carkit (easy install, professionally installed)
+ Factory test
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+EZX USB (EMU)
+
+
+ USB Configurations
+ Even in USB device EMU mode, there are many configs
+ Official configs
+ cdc_acm (serial modem emulation for host pc)
+ USB mass storage (transflash and VFAT-on-TFFS devices)
+ Undocumented configs
+ usbnet (network device over USB)
+ Allows telnet into phone
+ PST
+ Mode used by PST Windows App
+ DSPlog
+ Apparently a way to dump data from DSP
+ NetMonitor
+ supposedly for GSM network monitor
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+How to boot via USB
+
+
+ Button combination during power-on gets phone into bootloader
+ bootloader supports download of executable code from USB host into RAM
+ bootloader can jump to downloaded executable code
+ A Linux application (boot_usb) has been developed, using libusb
+ using boot_usb, we can boot our own kernel without flashing device
+ ideal for rapid kernel development
+ not really an option for final EZX distribution, what if no usb host around?
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Status
+
+
+ Status of Free Software on original kernel
+ Updated toolchain (gcc-3.4)
+ Linux native BlueZ bluetooth working
+ netfilter/iptables port (you can do NAT between GPRS and usbnet)
+ nmap/tcpdump/af_packet.o
+ lsof, busybox, bash2,
+ gameboy emulator
+ qonsole (qt console app with OSD keyboard)
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Status of kernel
+
+
+ The current 2.6.16.13-ezx5 kernel supports
+ PXA270FB with framebuffer based console + backlight
+ Serial Console (STUART on PCB, or FFUART via EMU -> USB)
+ New Driver for SSP/SPI (PCAP)
+ Driver for SD/MMC/Transflash using generic MMC stack
+ USB host controller (OHCI) towards BP working
+ USB device controller working (usbnet)
+ New Touchscreen driver
+ New Keypad driver
+ TODO
+ look into supporting other Motorola Linux phones
+ finish port of TS 07.10 mux and GPRS line discipline
+ fix initial gpio handshake between AP and BP
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Other Software
+
+
+ Other Free Software
+ ezxflash - Linux app (with GUI!) replacing proprietary P2K
+ fbgrabd
+ Daemon that runs fbgrab, creates PNG's and sends them via TCP
+ gpiotool
+ Tool for reading/reconfiguring/setting GPIO pins from userspace
+ pcaptool
+ Tool for reading/writing PCAP registers
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+TODO
+
+
+ TODO
+ some reference application that can make voice and/or data calls from the commandline
+ document Motorola vendor-specific AT commands, add them to libgsm
+ USB On-The-GO support (hardware support present!)
+ discover how DSPlog, PST, other interfaces work
+ dm-crypt for your personal contacts/data
+ native IPsec
+ ScummVM port [320x240 and touchpad, ideal!] :)
+ at some point merge with openembedded.org ?
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+OpenEZX
+Thanks
+
+
+ Thanks to
+ the BBS scene, Z-Netz, FIDO, ...
+ for heavily increasing my computer usage in 1992
+ KNF (http://www.franken.de/)
+ for bringing me in touch with the internet as early as 1994
+ for providing a playground for technical people
+ for telling me about the existance of Linux!
+ Alan Cox, Alexey Kuznetsov, David Miller, Andi Kleen
+ for implementing (one of?) the world's best TCP/IP stacks
+ Astaro AG
+ for sponsoring parts of my free software work
+ Chaos Computer Club (http://www.ccc.de/)
+ for providing an inspiring environment for cool hacks
+%size 3
+ The slides and the an according paper of this presentation are available at http://svn.gnumonks.org/projects/presentations
+%size 3
personal git repositories of Harald Welte. Your mileage may vary