Rockbox - Software Freedom Day 2010
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Daniel Stenbergs presentation om reverse engineering konsumentelektronik och Rockbox. Framfört den 18:e september 2010 på Svenska Linuxföreningens Linuxträfff 2010
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Rockbox - Software Freedom Day 2010
- 1. www.rockbox.org Software Freedom Day, Stockholm 18 september, 2010 Daniel Stenberg <daniel@haxx.se>
- 6. foss-sthlm
- 7. FSCONS
- 9. Hur byter man ut dem?
- 11. Hur bygger man mjukvara till den?
- 12. Lite om Rockbox – varför, vad, hur etc
- 13. Prylar Saker funkar inte som man vill
- 14. Folk gillar att bygga om grejor
- 15. Portabla musikspelare dök upp 2001 Inte så spektakulära
- 17. Jo alla
- 18. Sega
- 19. Dålig batteritid
- 21. Inga spel
- 22. Och mycket mycker mer
- 23. Hur svårt kan det vara? Björn Stenberg Linus Nielsen Feltzing Daniel Stenberg Stockholm Sverige, Dec 2001
- 25. Den kör larvig kod
- 26. Jag vill köra min kod istället
- 28. Hur hackar man en mp3-spelare? Eller åtminstone en genomgång om hur vi lyckats göra det hittills...
- 29. Community involvera massa folk! Tidsödande Enformigt Massor av jobb Svårt
- 31. Hi-Res scanna PCB och publicera
- 32. beepa koppel
- 34. - custom branded
- 35. SoC är fokus
- 37. USB
- 38. Sound Codec
- 39. RAM (typiskt kanske 32MB)
- 40. Flash (NOR för program/boot)
- 42. FM tuner
- 43. LCD (gråskala, 16bit färg, touch, …)
- 44. Fjärrkontroll
- 48. NDAs som bara den
- 49. delar av chips är sublicensierade - under andra licenser/NDAer
- 51. Blir svårare och svårare
- 53. BDM
- 54. UART
- 55. USB
- 57. Hur gör jag min egen upgradering?
- 58. Checksummor?
- 59. Scrambled / kryptering?
- 61. Analysera! Kolla olika varianter
- 63. Leta alternativ
- 64. Luckor i algoritmen eller dess implementation
- 65. Buffer overflows
- 67. luriga icke-”standard" CPU/DSP cores (calmrisc16)
- 68. Objdump är din vän
- 69. IDA Pro är dyrt
- 72. Ladda till RAM
- 74. Injicera i original / binary-patch
- 77. Button code
- 80. Gör den “upgraderingsbar” på spelaren
- 81. Prova den
- 82. Sedan är det nedförsbacke
- 84. USB
- 85. Inspelning
- 86. FM tuner
- 87. …
- 89. Mailinglistor
- 90. Forum
- 91. Snacka. Chatta. Testa. Rapportera. Hjälp. Sprid kunskap. Beskriv framgångar
- 92. Förvänta dig inte snabba resultat!
- 94. SW kan göras nästan utan kostnad, HW inte lika mycket
- 95. Lyre bygger spelare för att köra Rockbox
- 97. Det är dyrare att sätta in sig i andras kod
- 98. GPL är läskigt
- 99. Oklart
- 101. Litet
- 102. Skrivet från scratch
- 103. Cooperative multitasking med prioriteter
- 104. Message queues
- 105. UI
- 106. Loadable plugins
- 107. Loadable codecs
- 108. Themeable
- 110. Bygger våra egna cross-compilers
- 111. SVN
- 112. Bygg din egen binär på 30 minuter
- 113. Mest C, små delar i assembler
- 115. Distribuerat byggsystem (160 byggen på 100 sekunder)
- 116. Nedladdningsbara binärer efter varje commit
- 117. Bug tracker
- 120. Gapless playback
- 121. 5-band fully-parametric equalizer, och crossfeed
- 123. Cuesheet support
- 124. Album Art Support
- 127. Språk!
- 128. Talat interface
- 129. Target-specifika detaljerade 200+ sidiga manualer!
- 131. 100 plugins/apps
- 133. Emulators
- 134. MPEG videos
- 135. View pictures
- 136. … och mer!
- 137. Folk gillar skins
- 140. 900K lines of code
- 141. IRC
- 142. Distribuerade beslut
- 144. Devcons!
- 145. This is one of the largest open-source teams in the world, and is in the top 2% of all project teams on Ohloh.
- 147. Lagligt
- 148. Real name policy
- 149. Inga anonyma bidrag
- 150. Vi avråder från piratkopiering
- 152. Linux, Windows och Mac
- 153. Sandisk Sansa c100, Onda VX747, SanDisk Sansa Fuze, Sandisk Sansa Clip v1, iAudio M5, Archos FM Recorder, Cowon iAudio 7, iAudio X5, Apple iPod Mini 2nd gen, Apple iPod color/photo, Archos Recorder V2, Onda VX767, Logik Dax, Philips GoGear HDD6300, Samsung YH-925, Olympus M-Robe 500, Apple iPod 3rd gen, SanDisk Sansa c200, Tatung Elio, Archos Ondio FM, iriver H100/H115, Archos Recorder, Apple iPod Nano 2nd gen, iriver H120/H140, Archos Ondio SP, iriver H10 5GB, Philips GoGear SA9200, Philips GoGear HDD1800, Sandisk Sansa m200, Toshiba Gigabeat F/X, SanDisk Sansa e200 v2, Archos Jukebox 5000, Samsung YH-820, Apple iPod Nano 1st gen, iriver H320/H340, Creative ZVM, Apple iPod 4th gen gray, Cowon D2, Meizu M6, Archos Jukebox 6000, Toshiba Gigabeat S, Apple iPod Video 60 GB, Olympus M-Robe 100, Apple iPod 1st and 2nd gen, Samsung YH-920, Apple iPod Video 30 GB, Apple iPod Mini 1st gen, iAudio M3, Sandisk Sansa c200v2, iriver H10 20GB, Philips GoGear HDD1600, SanDisk Sansa e200
- 154. … torn!
- 155. Som fan!
Editor's Notes
- About Rockbox and how to get Free Software on mp3 players.
- Work at haxx 20 something projects 15K something public commits Open source contributor since 1995
- We all have gadgets that don't work like we wish they would For many years my mobile phone had lots of quirks I didn't like but couldn't make it stop doring.
- And we already appreciate and enjoy customizing our softwares and operating systems thanks to free and open software.
- The first portable music players appeared 2001 Archos was not the first, but one of the absolutely first harddrive based ones as the flash-based ones only had very very tiny storage back then 6GB disk, 12MHz SH7034. Dedicated mp3 decoding chip. 2MB ram.
- Let's make it better. Call out to get interested people to join.
- Probably applies to a lot of other sorts of devices but this talk is limited to portable music players only since that is what Rockbox runs on.
- Web site, wikis, mailing lists, forums. The more the merrier
- Various amounts of these parts can be embedded into the same circuit/SoC
- UART and USB are mentioned as they can be used to output data through and to use gdb on target with etc. Some Ofs even used (removed) UART to output debug messages.
- Finding a non-standard one without for example gcc port could in itself be a blocker for further work!
- Bricking devices is uncool JTAG and BDM might be able to download code to RAM
- We like dual-booting abilities The first-stage booting is even more very different between targets
- The steep uphill battle is done. Now the slightly more casual work begins.
- HW development is different - you need real money to make physical things MPEG, USB, SD etc licenses and “IP rights”
- We run on hard-drive devices with 2MB ram only, and then lots of that is used to buffer compressed music! Some recent flash-based players have even less ram.
- Traditional-style *nix-based cross-compiled development
- The simulator pops up a window looking like the target and it simulates the low layer APIs.
- Excellent audio playback is our primary focus
- We have a fairly large blind and visually impaired user-base thanks to our spoken interface, that works with pre-recorded sound-snippets played back when you hover over menu items. Manuals built daily and provided on site non-stop.
- Our focus on audio playback has made one or two people call the non-audio stuff “rubbish” or similar over the years. We emulate various old game systems. Doom is a native port, not an emulator. MPEG1 and 2 videos with fairly good frame rates on most devices.
- We have a dedicated theme site for people to upload their own creations for their particular device.
- Existing other Open source and Free Software projects make Rockbox possible. We could not have done this by ourselves.
- Developer conferences take place in the US and in Europe roughly once a year.
- Real name to emphasis our legal standpoint, to get a proper track of who did what and to avoid the nickname craziness many “hacking” projects use.
- Fancy UI point-and-click makes installing a breeze!
- We already have code running on a few more models since I made this slide a few weeks ago and I find it telling. A device is often called target and vice versa
- This is an old tradition and ritual of ours – some would even call it a sport. To build the biggest possible tower out of devices that can run Rockbox.
- Makes your mp3 player run Free Software