Difference between revisions of "Didj"

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'''This device is part of the [[LeapFrog_Pollux_Platform | LeapFrog Pollux Platform]], it's recommended to start there for general information.'''
 
[[image:didj.jpg|right|350px|thumb|The LeapFrog Didj]]
 
[[image:didj.jpg|right|350px|thumb|The LeapFrog Didj]]
  
−
== Project Summary ==
+
== Summary ==
−
The Didj is a toy produced by Leapfrog marketed for educational games for 5-10 year olds. Although it has a proprietary graphical front end, it runs a generic Linux distribution on an Arm based processor. Soon after the Didj's release, it was discovered that the cartridge port contained pins that allowed for serial console access with root privileges. After this discovery, work began to modify the Didj into an accessible emulation device.
+
The Didj was a toy produced by Leapfrog marketed for educational games for children aged 5-10.  
 +
 
 +
Didj was end-of-lifed by Leapfrog in mid-2010. It has been replaced by the [[Leapster Explorer]].
 +
 
 +
Although Didj has a proprietary graphical front end, it runs a generic Linux distribution on an Arm based processor. Soon after the Didj's release, it was discovered that the cartridge port contained pins that allowed for serial console access with root privileges. After this discovery, work began to modify the Didj into an accessible emulation device.
  
 
Since development began, much has been accomplished, including:
 
Since development began, much has been accomplished, including:
  
−
* Discovered that the Arm chip is the same as on the GP2X Wiz, only at a lower clock speed.
+
* Discovered that the Arm chip is the same as on the [[GP2X Wiz]], only at a lower clock speed.
 
* Created cartridges that support SD cards
 
* Created cartridges that support SD cards
 
* Accessed the UART features in the cartridge slot
 
* Accessed the UART features in the cartridge slot
  
−
== Project Goals ==
 
−
Here is a place to list all the the goals or wants that we have for this project.
 
  
−
* [http://en.wikipedia.org/wiki/GP2X GP2x] / [http://en.wikipedia.org/wiki/GP2X_Wiz GP2x Wiz]
+
== Platform ==
−
** Port Libraries
+
[[LeapFrog_Pollux_Platform | LeapFrog Pollux Platform]]
−
** Flash Player
 
−
** Emulation ([http://www.globalgph.com/m3/sub4.php Wiz Emulators])
 
−
*** NES
 
−
*** SNES
 
−
*** Gameboy BW/Color/Advanced
 
−
*** Gamegear
 
−
*** MAME
 
−
*** Atari 2600
 
−
*** Colecovision
 
−
*** Others
 
−
* GUI
 
−
** Custom or Modified
 
−
*** Customizable Themes
 
−
* Homebrew Games
 
−
* Overclock Processor
 
  
−
== Tutorials/How To's ==
+
The Didj is part of 3 different devices that all share a common hardware platform, based around the [[Pollux]] SoC. The platform page contains information generic across these devices, and it is recommended that you refer to that page as it is a good starting point to understanding the Didj, and contains some basic How To's and Tutorials to get you started.
  
−
* [[Didj_How_to_Extract_Files|How to extract files from the firmware .exe]]
+
== Boot Loader ==
−
* [[Didj Serial Console|Adding Serial Console]]
+
* [[Didj_Lightning_Boot| Lightning Boot ]]
−
* Gain access to the Didj as a thumb drive [http://wtfmoogle.com/?page_id=741 from Windows].
+
* [[Didj_U-Boot| U-Boot ]]
−
* [[Didj Kernel Build Environment|Creating a Kernel Build Scratchbox]]
+
* [[Didj_Emerald_Boot| Compile and Install Emerald-Boot]]
−
*[http://www.elinux.org/LFConnect_Update_Server_Bypass LFConnect Update Server Bypass]
 
−
*[http://www.elinux.org/Didj_BootLoader_Firmware_Updating Updating Bootloader/Firmware over USB]
 
−
*[http://www.elinux.org/Didj_Boot_From_UART Boot Didj From UART Connection]
 
−
*[http://www.elinux.org/Didj_Mount_File_System_Under_Linux Mount Didj File System Under Linux]
 
−
*[http://www.elinux.org/Didj_USB_Mounting USB Mounting Under Windows and Linux]
 
−
*[http://www.elinux.org/Didj_Common_Commands Common Commands Reference]
 
−
*[[Didj SD MMC Expansion]]
 
−
*[[Didj Stop Start Up Junk]] How to remove all the kids game files
 
  
−
== Technical Information ==
+
== Sources and Toolchains ==
 +
* [[LeapFrog_Pollux_Platform:_Source_Code| Sources and Toolchains]]
  
−
* [http://sites.google.com/site/claudeschwarz/didjhacking2 Home Brew Cartridge and Custom Bootloader]
+
== Tutorials/How To's ==
−
* [[Didj_Mem_Map|Initial Memory Map Dump]]
+
''' General '''
−
* The #edev guys (#edev on irc.freenode.net) located [http://www.leapfrog.com/etc/medialib/leapfrog/legal.Par.14642.File.dat/Additional%20Third%20Party%20Notices%20for%20LF%20Connect%20Application%20.pdf THIS] on the leapfrog site.
+
* [[Didj_Common_Commands|Common Commands Reference]]
−
** [http://medialib.leapfrog.com/didj_opensource_code/Didj-Linux-3197-20080429-1631.tar.gz Didj Linux and root filesystem source is here]
+
* [[LeapFrog_Pollux_Platform:_Console_Access|Console Access]]
−
** busybox isn't listed
+
* [[LeapFrog_Pollux_Platform:_Cartridge| Cartridges]]
−
* The linux kernel source is now available from LeapFrog.
+
** [[LeapFrog_Pollux_Platform:_Cartridge_Settings| Cartridge Settings]]
−
[http://medialib.leapfrog.com/didj_opensource_code/Didj-Linux-3197-20080429-1631.tar.gz 2008 version]
+
* [[LeapFrog_Pollux_Platform:_Extract_Archives| Extract lfp/lf2 Archives]]
−
 
+
''' Networking '''
−
[http://medialib.leapfrog.com/didj_opensource_code/Didj-Linux-4222-20090422-1236.tar.gz 2009 version]
+
* [[Didj_Enable_Networking| Enable Networking via USB Gadget]]
−
* [[Didj Source Info]]
+
* [[Didj_Install_Dropbear| Install Dropbear SSH]]
−
* [http://git.berlios.de/cgi-bin/gitweb.cgi?p=opendidj;a=blob_plain;f=host_tools/lf1000_bootstrap.py;h=f0d3ef0d9186edf368062608ff868914e6083ee4;hb=06890453479d271856f58d1d2cb685ee6e5afd5f LF1000 UART Bootstrap Utility] written in Python
+
* [[Didj_MP3_Streaming| Playing MP3 network streams and files]]
−
* [[media:lf1000-bootstrap-utilities.tar.gz |LF1000 UART Bootstrap Utilities]] based on the OMAP boot utilities from TI
+
* [[LeapFrog_Pollux_Platform:_Networking| Networking Setup]]
 +
* [[LeapFrog_Pollux_Platform:_Networking_Applications| Networking Applications]]
 +
* [[LeapFrog_Pollux_Platform:_Internet_Access| Internet Access from Device]]
 +
* [[LeapFrog_Pollux_Platform:_Mount_NFS_Directory| Mount NFS Directory]]
  
−
== Discussion ==
+
''' USB Storage '''
 +
* [[Didj_USB_Mounting|USB Mounting Under Windows, Linux, and OS X]]
 +
* [[Didj_SCSI_Commands|SCSI Commands]]
  
−
* [http://www.hackerfoundry.com/forums/viewtopic.php?f=4&t=7&sid=4cc66fd2128b96e03603c812ba926301 Didj Project Forum]
+
''' Cartridge '''
−
* [irc://chat.freenode.net/didj #Didj on Freenode IRC]
+
* [[Didj_Make_ATAP| Make an ATAP NAND Cartridge]]
−
* [http://www.cozybit.com/stories.htm Cozybit boasts of their involvment in integrating Linux with the Didj]
 
−
* [http://blogs.distant-earth.com/wp/?p=64 Hacking around with the Leapfrog Didj]
 
−
* [http://didjdev.freeforumhost.com/viewforum.php?f=3 Didj Homebrew Forum] (Empty?)
 
−
* Hackaday Posts
 
−
** [http://hackaday.com/2010/02/01/leapfrog-didj-handheld-linux-on-the-cheap/ Didj Hacking]
 
−
** [http://hackaday.com/2010/02/03/leapfrog-didj-followup/ Didj Hacking Followup]
 
  
−
==Graphics Hardware ==
+
''' Flash NAND '''
 +
* [[Didj_U-Boot_NAND_Flashing| Flash Data to NAND]]
 +
* [[Didj_BootLoader_Firmware_Updating|Updating Bootloader/Firmware]]
  
−
* Resolution: 320x240
+
''' Firmware Image '''
 +
* [[File_Systems#Mounting_JFFS2_image_on_PC_using_mtdram| Mount JFFS2 Image on Linux]]
 +
** Relevant Settings
 +
** Correct endianess
  
−
* Display Modes: RGBA 565
+
* [[LeapFrog_Pollux_Platform:_Firmware#Didj_JFFS2 | Create JFFS2 image]]
 +
** Relevant Settings
 +
** -e 128
 +
** -p
  
−
* MLC: Multi-layer controller provides HW compositing for up to three graphics layers
+
''' Kernel/RootFS/Firmware'''
−
** One 24-bit 2D layers (no HW accel)
+
* [[Didj_and_Explorer_libSDL|Building libSDL]]
−
** One 16-bit 3D layer
+
* [[Didj_and_Explorer_SDL_ttf|Building SDL_ttf font library]]
−
** One YUV video layer (no HW accel)
+
* [[Didj_and_Explorer_SDL_image|Building SDL_image library with jpg and png support]]
 +
* [[Didj_and_Explorer_SDL_mixer|Building SDL_mixer audio library]]
 +
* [[Leapster_Explorer:_tslib_Touchscreen_Library|Building tslib]]
 +
* [[Leapster_Explorer:_SDL_resources|SDL Resources]]
 +
* [[Didj_2.6.31_Kernel| Didj Kernel 2.6.31 Upgrade]]
 +
* [[Didj_Explorer_Kernel|2.6.31 Kernel for Didj]]
 +
* [[Didj_Explorer_SD_Kernel| Boot Kernel and Rootfs from SD w/Framebuffer]]
 +
* [[Leapster_Explorer_Framebuffer_Driver|Linux Framebuffer Driver]]
 +
* [[Didj_and_Explorer_MMC_Patch|Enable SD Card Module]]
 +
* [[Leapster_Explorer_Root_File_System|Building The Explorer Root File System]]
 +
* [[Didj_and_Explorer:_boot_pixel_format|Changing the fb driver to display the boot logo correctly]]
 +
* [[LeapFrog_Pollux_Platform:_TV_Out | TV Out]]
 +
* [[Didj_2.6.31_Generic_Buildroot | Generic Buildroot Rootfs and Kernel build]]
  
−
* Graphics API OpenGL ES 1.1: A reduced instruction set version of OpenGL for embedded systems. OpenGL is a 3D graphics programming interface. Proprietary interface to Multi- Layer Display controller for 2D RGB and YUV video buffer support. FreeType Font renderer. Theora video codec plays OGG-Theora files.
+
''' Games and Emulators '''
 +
* [[LeapFrog_Pollux_Platform:_Emulators_And_Games| Emulators and Games]]
  
−
== Chip List ==
+
''' Brio Development '''
 +
* [[Didj_Replacement_App_Menu| Replacing the default App Menu from the default App Menu]]
  
−
[[Image:Didj Mainboard Front.jpg|350px|thumb|A picture of the front of the Didj mainboard]]
+
''' JTAG '''
 +
* [[LeapFrog_Pollux_Platform:_JTAG_Pinouts| JTAG Pinouts]]
 +
* [[Pollux:_FTDI_JTAG_How_To| Pollux FTDI JTAG How To]]
 +
* [[Pollux_JTAG_with_Wiggler| Pollux JTAG Wiggler Config]]
 +
* [[LeapFrog_Pollux_Platform:_JTAG_Kernel_Boot| JTAG Kernel Boot]]
  
−
[[Image:Didj Mainboard Back.jpg|350px|thumb|A picture of the back of the Didj mainboard]]
+
''' Compiling Source Code '''
 +
* [[LeapFrog_Pollux_Platform:_Build_Environment| Set up the Build Environment]]
 +
* [[LeapFrog_Pollux_Platform:_Kernel_Configuration| Kernel Configuration]]
  
−
==== Processor ====
+
== Development Scripts and Programs ==
−
* OEM branded version of the MagicEyes [[Pollux]] VF3520F [[media:pollux-datasheet.pdf|Datasheet]]
 
−
* Appears to be the 393MHz version of the same processor in the [http://gp2xwiz.com/ GP2x Wiz]
 
−
* Marked with:
 
−
** "LF-1000" - [[LF-1000|LF-1000 Specifications]]
 
−
** "ARM"
 
−
** "N12N1D"
 
−
** "H0815"
 
  
−
==== Memory ====
+
* [http://git.berlios.de/cgi-bin/gitweb.cgi?p=opendidj;a=blob_plain;f=host_tools/lf1000_bootstrap.py;h=f0d3ef0d9186edf368062608ff868914e6083ee4;hb=06890453479d271856f58d1d2cb685ee6e5afd5f LF1000 UART Bootstrap Utility] written in Python
−
* 1 QImonda HYB25DC25616OCE-5 - 32megabyte sdram [[media:HYB25DC25616OCE-5.pdf | Datasheet]]
+
* [[media:lf1000-bootstrap-utilities.tar.gz |LF1000 UART Bootstrap Utilities]] based on the OMAP boot utilities from TI
−
* 1 Micron MT29F2G08AAC - 256megabyte nand flash 8-bit [[media:MT29F2G08AAC.pdf | Datasheet]]
 
  
−
==== Audio ====
+
== Technical Information ==
−
* 1 Cirrus Logic CS43L22 - audio codec [[media:CS43L22.pdf | Datasheet]]
+
* [[Didj_Mem_Map|Initial Memory Map Dump]]
 +
* [[Didj_GPIO_Map|Map of Didj GPIO Pins]]
 +
* [[LeapFrog_Pollux_Platform:_Technical_Details|Device Comparison]]
  
−
==== Display Driver ====
+
''' File System Info '''
−
* 1 Giantplus GPM758A0 - 320x240 TFT [http://www.giantplus.com.tw/en/p/34-color_stn_module-gpg0909_3.html Pinouts and Specifications]
+
* rootfs / rootfs rw
 +
* /dev/root / jffs2 ro
 +
* none /proc proc rw
 +
* sysfs /sys sysfs rw
 +
* /dev/ram0 /tmp tmpfs rw
 +
* /dev/mtdblock1 /flags jffs2 rw,sync,noatime
 +
* /dev/mtdblock2 /mfgdata jffs2 ro,sync,noatime
 +
* /dev/mtdblock10 /Didj vfat rw,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha  rset=iso8859-1
 +
* /dev/mtdblock11 /Cart vfat ro,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha  rset=iso8859-1
  
−
==== Power ====
+
Filesystem                Size      Mounted on
−
* 1 Intersil ISL7665SACBAZ - Programmable Over/Under Voltage Detector [[media:isl7665s.pdf | Datasheet]]
+
/dev/mtdblock6          14.0M    /
−
* 3 TI TPS62050 - Adjustable Step-Down Converter [[media:tps62050.pdf | Datasheet]]
+
/dev/mtdblock1          896.0k    /flags
 +
/dev/mtdblock2            1.0M    /mfgdata
 +
/dev/mtdblock9          215.8M    /Didj
  
−
==== Crystals ====
 
−
* Oscillators
 
−
** 12MHz Crystal
 
−
*** For usb
 
−
** 27MHz Crystal
 
−
*** For the Processor*
 
−
** Barrel Crystal
 
−
*** For the RTC 32.768KHz*
 
  
−
==== Test Pads ====
+
''' Active Kernel/Rootfs
−
* Possible JTAG on pads
 
−
or touch screen interface?
 
−
** TP8 - Vcc
 
−
** TP9
 
−
** TP10
 
−
** TP11
 
−
** TP12
 
−
** TP13
 
−
** TP14 - Vss
 
  
−
==== Ethernet? ====
+
Near the begging of the boot message you should see one of two root options:
−
There is info of a CS9800 Ethernet controller used on the development board
+
root=31:04
 +
You are using  mtd4: 00e00000 00020000 "Linux_RFS0" or
 +
root=31:06
 +
You are using  mtd6: 00e00000 00020000 "Linux_RFS1"
  
−
<nowiki>* See the processor datasheet page 20.</nowiki>
 
  
−
= Cartridges =
+
''' Partitions '''
−
== Original Cartridge ==
+
{| cellpadding="4" border="1"
−
Manufactured by Sandisk
+
|-
−
* s740878-1
+
|style="background-color:#CCCCCC"| Name
−
* 4620329
+
|style="background-color:#CCCCCC"| Location
−
* 0621
+
|style="background-color:#CCCCCC"| Size
−
* 151-10043-07-a
+
|style="background-color:#CCCCCC"| Device
−
<gallery widths=200px>
+
|style="background-color:#CCCCCC"| Notes
−
Image:cartfront.jpg|Original Cartridge Front
+
|-
−
Image:cartback.jpg|Original Cartridge Back
+
| LF1000_uniboot
−
</gallery>
+
| 0x00000000
−
[[Category:Hardware]]
+
| 0x00020000
−
== Custom Cartridges ==
+
| /dev/mtd0
 +
| Lightning Boot
 +
|-
 +
| Atomic_Boot_Flags
 +
| 0x00020000
 +
| 0x000E0000
 +
| /dev/mtd1
 +
| On NAND
 +
|-
 +
| Manufacturing_Data
 +
| 0x00100000
 +
| 0x00100000
 +
| /dev/mtd2
 +
| On NAND
 +
|-
 +
| Kernel0
 +
| 0x00200000
 +
| 0x00200000
 +
| /dev/mtd3
 +
| On NAND
 +
|-
 +
| Linux_RFS0
 +
| 0x00400000
 +
| 0x00E00000
 +
| /dev/mtd4
 +
| On NAND
 +
|-
 +
| Kernel1
 +
| 0x01200000
 +
| 0x00200000
 +
| /dev/mtd5
 +
| On NAND
 +
|-
 +
| Linux_RFS1
 +
| 0x01400000
 +
| 0x00E00000
 +
| /dev/mtd6
 +
| On NAND
 +
|-
 +
| Brio
 +
| 0x02200000
 +
| 0x0DE00000
 +
| /dev/mtd7
 +
| On NAND
 +
|-
 +
| EXT
 +
| 0x10000000
 +
| 0x10000000
 +
| /dev/mtd8
 +
|
 +
|-
 +
| Cartridge
 +
| 0x00000000
 +
| 0x10000000
 +
|
 +
| On Cartridge NAND
 +
|}
  
−
=== Home Etched Didj Breakout Board ===
 
  
−
* Easy to make at home (can be made with a radioshack kit and a dremel)
+
''' Battery Compartments '''
−
* The board layout was designed in eagle.
 
−
** The Eagle Board file [[media:dijibreakoutboard.zip|Download]]
 
−
** The Didj Edgecard connector library file [[media:LEAPFROG_DIJI_EDGECARD.zip|Download]]
 
−
*** You can use this to make any board you want.
 
−
** Edited Didj Cartridge library [http://alternet.us.com/other/LEAPFROG_DIdj.zip Download]
 
−
*** (including outlines and keepout regions according to Awesomnesser's diagrams)
 
−
* This cartridge locks in just like the real thing.
 
−
** It is easy to do just superglue a small piece of FR4 in the corner and dremel a notch out. (see dimensions below)
 
−
** You will also need a spacer on the top and bottom and those dimensions are also included.
 
  
−
<gallery widths=200px>
+
The Didj has two identical battery compartments, the combined collection of batteries are wired in series.
−
Image:Awesomenesser01.jpg|The breakout board
+
* Battery Compartment Terminals:
−
Image:Awesomenesser02.jpg|The bottom of the board
+
** Term 1 - Battery +
−
Image:Awesomenesser03.jpg|The breakout board clicked into the Didj
+
** Term 2 - Temp Sensor +  Wired to Pollux pins K20 / GPIOA 28 and K21 / GPIOA 29
−
Image:Awesomenesser04.jpg|The board hooked up to a sd card and FTDI cable (same as Claudes board)
+
** Term 3 - Temp Sensor -
−
Image:Awesomenesser05.jpg|The dimensions of the basic cartridge
+
** Term 4 - Battery -
−
Image:Awesomenesser06.jpg|The laser printout for the toner transfer (Remember to mirror your printout and turn off the unused layers)
 
−
</gallery>
 
  
−
=== Hack an Original Cart ===
 
  
−
* Modify an original cart to have a uart output
+
''' Rechargeable Batteries '''
−
<gallery widths=200px>
 
−
Image:hacked.jpg|Modified original cartridge
 
−
</gallery>
 
  
−
=== Claudes Cartridge ===
+
In addition to the terminals facing the Didj's contacts, there are another set of contacts facing away from the Didj.
−
* Features
+
These contacts are duplicates used by the charging station. The batteries themselves are NIMH cells, producing around 2.5v per pack when fully charged.
−
** Jumpers (For custom bootloader)
 
−
** SD Card (Enabled through the custom bootloader)
 
−
** USB through a FTDI chip
 
−
** Optional NAND
 
−
* [http://sites.google.com/site/claudeschwarz/didjhacking2 Claudes Website]
 
−
* [[media:ClaudesSchematic.pdf | Claudes Schematic]]
 
−
* [[media:ClaudesGerberFiles.zip | Claudes Gerber Files]]
 
−
<gallery widths=200px>
 
−
Image:claudesboardrendered.jpg|Rendering
 
−
Image:claudesboardpopulated.jpg|Populated Cartridge
 
−
</gallery>
 
  
−
=== SD and USB Serial Cart ===
 
  
−
* Features
+
''' Recharging Station '''
−
** Fits (mostly) within the Didj
 
−
** Includes an FTDI FT232RL USB-Serial adaptor for Bootloader and Serial Console
 
−
** Includes SD card slot
 
−
** Includes solder jumpers for custom bootloader
 
−
** Open Eagle source files (CC Attribution, Non-Commercial, Share Alike)
 
−
* [http://alternet.us.com/other/SD_UART-2.pdf Front and Back PDF]
 
−
* [http://alternet.us.com/other/SD_UART-2.zip Eagle files]
 
−
* [http://batchpcb.com/index.php/Products/27971 BatchPCB public design]
 
−
* Comments welcome!
 
−
** Gerbers haven't been made yet.  Please post comments here, or as a message to me.
 
−
** I think the design is correct based on Claude's schematic and Awesomenesser's diagrams, but I can't be sure.
 
−
** Later, I'll have this produced by BatchPCB, I'll post a link to the public design on that site, if others want boards made.
 
  
−
= File System Info =
+
The recharger station contains a battery charge circuit with temperature monitoring.  The station also has a pair of contacts that duplicate the 9V dc barrel jack.
  
−
*rootfs / rootfs rw
 
  
−
*/dev/root / jffs2 ro
+
''' SSP / SPI Controller '''
 +
[[Didj SPI Info]]
  
−
*none /proc proc rw
+
== Images ==
 +
<gallery perrow=5 caption="PCB Images">
 +
File:Scanned-desoldered-mainboard-front-v2.jpg|Front side mainboard, with LF1000 CPU and SDRAM de-soldered.
 +
File:Bga-closeup.jpg|Close up of the LF1000 CPU ball-grid.
 +
File:Scanned-desoldered-mainboard-back-v2a.jpg|Back side mainboard, with cartridge socket and NAND de-soldered.
 +
File:Didj Mainboard Front.jpg|Front side mainboard
 +
File:Didj Mainboard Back.jpg|Back side mainboard
 +
</gallery>
  
−
*sysfs /sys sysfs rw
+
== External Links ==
−
 
+
* [http://www.cozybit.com/stories.htm Cozybit boasts of their involvment in integrating Linux with the Didj]
−
*/dev/ram0 /tmp tmpfs rw
+
* [http://blogs.distant-earth.com/wp/?p=64 Hacking around with the Leapfrog Didj]
−
 
+
* [http://sites.google.com/site/claudeschwarz/didjhacking2 Claude's Didj Hacking Page]
−
*/dev/mtdblock1 /flags jffs2 rw,sync,noatime
+
* Hackaday Posts
−
 
+
** [http://hackaday.com/2010/02/01/leapfrog-didj-handheld-linux-on-the-cheap/ Didj Hacking]
−
*/dev/mtdblock2 /mfgdata jffs2 ro,sync,noatime
+
** [http://hackaday.com/2010/02/03/leapfrog-didj-followup/ Didj Hacking Followup]
−
 
 
−
*/dev/mtdblock10 /Didj vfat rw,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha  rset=iso8859-1
 
−
 
 
−
*/dev/mtdblock11 /Cart vfat ro,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha  rset=iso8859-1
 
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Filesystem                Size      Mounted on
 
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/dev/mtdblock6          14.0M    /
 
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/dev/mtdblock1          896.0k    /flags
 
  
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/dev/mtdblock2            1.0M    /mfgdata
 
  
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/dev/mtdblock9          215.8M    /Didj
 
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#
 
  
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== Important File Locations ==
+
[[Category:Didj]]
 +
[[Category:LeapFrog Pollux Platform]]

Latest revision as of 00:08, 26 February 2013

This device is part of the LeapFrog Pollux Platform, it's recommended to start there for general information.

The LeapFrog Didj

Summary

The Didj was a toy produced by Leapfrog marketed for educational games for children aged 5-10.

Didj was end-of-lifed by Leapfrog in mid-2010. It has been replaced by the Leapster Explorer.

Although Didj has a proprietary graphical front end, it runs a generic Linux distribution on an Arm based processor. Soon after the Didj's release, it was discovered that the cartridge port contained pins that allowed for serial console access with root privileges. After this discovery, work began to modify the Didj into an accessible emulation device.

Since development began, much has been accomplished, including:

  • Discovered that the Arm chip is the same as on the GP2X Wiz, only at a lower clock speed.
  • Created cartridges that support SD cards
  • Accessed the UART features in the cartridge slot


Platform

LeapFrog Pollux Platform

The Didj is part of 3 different devices that all share a common hardware platform, based around the Pollux SoC. The platform page contains information generic across these devices, and it is recommended that you refer to that page as it is a good starting point to understanding the Didj, and contains some basic How To's and Tutorials to get you started.

Boot Loader

Sources and Toolchains

Tutorials/How To's

General

Networking

USB Storage

Cartridge

Flash NAND

Firmware Image

Kernel/RootFS/Firmware

Games and Emulators

Brio Development

JTAG

Compiling Source Code

Development Scripts and Programs

Technical Information

File System Info

  • rootfs / rootfs rw
  • /dev/root / jffs2 ro
  • none /proc proc rw
  • sysfs /sys sysfs rw
  • /dev/ram0 /tmp tmpfs rw
  • /dev/mtdblock1 /flags jffs2 rw,sync,noatime
  • /dev/mtdblock2 /mfgdata jffs2 ro,sync,noatime
  • /dev/mtdblock10 /Didj vfat rw,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha rset=iso8859-1
  • /dev/mtdblock11 /Cart vfat ro,noatime,fmask=0022,dmask=0022,codepage=cp437,iocha rset=iso8859-1
Filesystem                Size       Mounted on
/dev/mtdblock6           14.0M     /
/dev/mtdblock1          896.0k    /flags
/dev/mtdblock2            1.0M    /mfgdata
/dev/mtdblock9          215.8M    /Didj


Active Kernel/Rootfs

Near the begging of the boot message you should see one of two root options: 

root=31:04

You are using mtd4: 00e00000 00020000 "Linux_RFS0" or 

root=31:06

You are using mtd6: 00e00000 00020000 "Linux_RFS1"


Partitions

Name Location Size Device Notes
LF1000_uniboot 0x00000000 0x00020000 /dev/mtd0 Lightning Boot
Atomic_Boot_Flags 0x00020000 0x000E0000 /dev/mtd1 On NAND
Manufacturing_Data 0x00100000 0x00100000 /dev/mtd2 On NAND
Kernel0 0x00200000 0x00200000 /dev/mtd3 On NAND
Linux_RFS0 0x00400000 0x00E00000 /dev/mtd4 On NAND
Kernel1 0x01200000 0x00200000 /dev/mtd5 On NAND
Linux_RFS1 0x01400000 0x00E00000 /dev/mtd6 On NAND
Brio 0x02200000 0x0DE00000 /dev/mtd7 On NAND
EXT 0x10000000 0x10000000 /dev/mtd8
Cartridge 0x00000000 0x10000000 On Cartridge NAND


Battery Compartments

The Didj has two identical battery compartments, the combined collection of batteries are wired in series.

  • Battery Compartment Terminals:
    • Term 1 - Battery +
    • Term 2 - Temp Sensor + Wired to Pollux pins K20 / GPIOA 28 and K21 / GPIOA 29
    • Term 3 - Temp Sensor -
    • Term 4 - Battery -


Rechargeable Batteries

In addition to the terminals facing the Didj's contacts, there are another set of contacts facing away from the Didj. These contacts are duplicates used by the charging station. The batteries themselves are NIMH cells, producing around 2.5v per pack when fully charged.


Recharging Station

The recharger station contains a battery charge circuit with temperature monitoring. The station also has a pair of contacts that duplicate the 9V dc barrel jack.


SSP / SPI Controller Didj SPI Info

Images

  • PCB Images
  • Error creating thumbnail: File with dimensions greater than 12.5 MP

    Front side mainboard, with LF1000 CPU and SDRAM de-soldered.

  • Close up of the LF1000 CPU ball-grid.

  • Error creating thumbnail: File with dimensions greater than 12.5 MP

    Back side mainboard, with cartridge socket and NAND de-soldered.

  • Front side mainboard

  • Back side mainboard

External Links

Retrieved from "https://elinux.org/index.php?title=Didj&oldid=224210"