Commits on Jan 9, 2012

1. HACK HACK HACK: Got the linux kernel working on the 2g touch. …

   The way that I did it is terrible though. I took the iphone 3g config and
   modified everything from there without actually making a new config for the 2g
   touch. In other words, compile this code for the iphone 3g and it actually runs
   on the 2g touch. Ugh that is so nasty. Anyways, this boots on the 2g touch and
   gets a bunch of stuff up and running. I'm not 100% sure what all works, but it
   makes it though all of the basic initialization. There aren't really drivers for
   anything after that though... I hacked printk to output to the framebuffer that
   iBoot sets up, so you do get output on the screen as the kernel is booting.
   
   INSTRUCTIONS FOR USE:
   
   This really shouldn't be in a git commit message, but I'm too lazy to put it
   elsewhere.
   
   If anybody wants to actually do something with this code, you should do
   everything properly and make a proper config for the 2g touch that doesn't just
   modify the iphone 3g one. For new drivers for the 2g touch, you should start by
   looking at openiBoot (everything up to but not including NAND is working there
   for the 2g touch) and at the a4 kernel on the iDroid-Project page. It should be
   pretty easy to get the kernel up to the level that openiBoot is at.
   
   I've added a .config to this git commit that will build linux for the 2g touch.
   Just run make in the main folder, and it will spew out the kernel at
   arch/arm/boot/zImage. I've just been using the initrd from the main idroid
   project distribution (android.img.gz or whatever) so grab that too.
   
   To use this kernel, use the openiBoot in my (kleemajo's) github repository. It
   has a couple patches specific to the 2g touch that are needed due to the
   device's memory setup (initrd gets placed in the wrong spot on the 2g touch
   using the stock iDroid-Project openiBoot).
   
   From the openiBoot console, send the kernel and initrd over and then boot linux.
    This is done with the commands:
   !/path/to/zImage
   kernel
   !/path/to/android.img.gz
   initrd
   boot
   
   If everything goes well, you will see the output of linux booting on your LCD!
   
   I don't have time to do much more with this kernel: my objective was always just
   to get some form of linux on the 2g touch. If someone wants to port all of the
   drivers and get a full android working then please go ahead. Unfortunately,
   there isn't much developer interest for this specific device so you will most
   likely be on your own.  If a serious developer is interested in getting a full
   android port, I can help you out and share more of my knowledge. I unfortunately
   don't have the time to train people who have never done this before though so
   please only contact me if you are very familiar with C and ARM assembler and
   have a good knowledge of how the iPhone and iPod Touch work already. I've put up
   a guide at http://www.idroidproject.org/wiki/User:Kleemajo that will get you up
   to speed. If you have read though that whole guide and understand everything in
   it, then feel free to contact me at kleemajo@gmail.com for help.
   
   The big step that is still missing before android is possible is NAND support.
   To put it nicely, NAND is a bitch and is going to take a lot of effort and time
   to reverse engineer. The iphone 4 guys (Bluerise, ricky26 et. al) are doing a
   great job with the FTL reversing, and a lot if not all of that code can be used
   directly on the 2g touch. The main issue is that the low level flash drivers are
   different... the 2g touch uses something called "h2fmss" which is completely
   different from what is done on the 8900 (iPhone 2G/3G) series of devices and
   also completely different from the "h2fmi" used on the a4 (iPhone 4G) series. It
   is a huge chunk of code and seems to get bigger and bigger the more that you
   look at it...
   
   To anyone who has read though this, good luck!

   

   kleemajo committed Jan 9, 2012
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