Sandisk Sansa View

[Bagder]

The sansa view is using the mi4 file format and we have already extracted the key for the View so all you need is to download the mi4code tool and decrypt it yourself.

[crackmonkey421]

OK.. I've updated the View's wiki
http://www.rockbox.org/twiki/bin/view/Main/SansaView

I'll link it to the new ports section once we figure out how to use some of the hardware.

[Bagder]

I think even the BL.rom file outputs on the screen and given its much smaller size that should be a good start to disassemble to find out these details.

And the mi4 nature of this target should make it perfectly safe to run experimental builds on too.

rockfarm: notice that there's no reason to believe (yet) that the e200 and view are any similar LCD-wise and the page you mention is about the sansa e200

[crackmonkey421]

IDA Pro works for ARM and Windows, but it is not free nor cheap. There might be others that I don't know of.

http://www.hex-rays.com/idapro/

I'll post my arm-elf-objdumps, but compared to understanding them, creating them is very easy. So posting them might be pointless, but here you go anyway:

arm-elf-objdump -D --target binary -marm bootLoader.rom > bootLoader.rom.objdump
http://rapidshare.com/files/132287509/bootLoader.rom.objdump.html

arm-elf-objdump -D --target binary -marm -Mforce-thumb bootLoader.rom > bootLoader.rom.thumb.objdump
http://rapidshare.com/files/132288468/bootLoader.rom.thumb.objdump.html

[crackmonkey421]

Would it be unlawful to post the AS3517 data sheet?

To request it yourself:
http://www.austriamicrosystems.com/eng/Products/Audio/Audio-Front-Ends/AS3517/(rq)/1

I'd like to get the data sheets for AS3525 and AS3514 as well to aid in research of similar ports..  Is there a place to download these or should I just try requesting each one from AMS?

It's lonely in here...

[saratoga]

Would it be unlawful to post the AS3517 data sheet?

They gave them out on the condition that they not be posted online.  If someone gets to the point on the View port where they are ready to begin writing the DAC driver, I'm sure we'll be able to get them a copy of the datasheet.

[Bagder]

Other methods of finding the exact LCD controller in use have involved finding out the init sequence (by reverse engineering the Original Firmware) and then comparing that init sequence with datasheets (or code) for existing LCD controller suspects.

[dram_dave]

Has anyone looked at the View's power management?  The AS3517's three main buck converter outputs (supplies) shift their voltages from 1.0v / 1.7v / 3.0v in mp3 playback to 1.2v / 1.8v / 3.3v during video playback when the CPU etc. presumably need faster speed.  The SDRAM clock rate also switches by a factor of 3x.  Does anyone know if this was done on the e200 series (and where in the code)?

[rockfarm]

Not sure if this helps at the moment, but here's something.
Using funman's idea of Googling info on some chips on the PCB, I have managed to find a data sheet on the internet for the Samsung K4M56323PG-HG75. It's an SDRAM chip, and I found it on space_ghost's scan of the back of the PCB.
The data sheet can be found on this page:
http://www.samsung.com/global/business/semiconductor/productInfo.do?fmly_id=136&partnum=K4M56323PG

Again, I hope this helps.

[Scrtcwlvl]

Not sure if this helps, but I removed the metal plate on the back of my views LCD and there were some numbers on the back as well as a few on the side.

I have a smashed View I use for parts and am not the slightest bit afraid of opening my good 16gb working view.  I did notice however, there were different numbers on the 8gb ribbon connector for the LCD and the 16gb ribbon connector (this could be a mute point, just wanted to put it out there.)


The black numbers on the back read
TD-T240T2G120-10
S070914008
(in case they are hard to read)

and on the side is BLU120-10 A3 S70821209C

Not sure if this is a help or nothing at all, I was contacted by a Pepa.Vidlak  to post what I could on the LCD, this is all I got.

[yapper]

http://www.dragonlcd.com/Standard_TFT_Module.htm mentions T240T2G120. There is also a link on this page http://www.dragonlcd.com/Technical_Info.htm for LCD Driver Info, but that link is currently broken. However there is a Sales email address listed

[zivan56]

Good find.  It appears all the characteristics match: model number, 2.4 inch, 240x320 resolution.  Also, the driver info page cached by Google: http://209.85.173.104/search?q=cache:2rX4xAsiffgJ:www.dragonlcd.com/Technical_Info_LCD_Driver.htm

[yelped]

Good job on the LCD!

Also I think I have found out who makes the wheel and the buttons.
On space ghost's pictures, it said Omron on one of the chips, so I went to their website, and look what I found...

http://www.components.omron.com/components/web/webfiles.nsf$FILES/family.html?ID=GTAA-76GR75
And there is a link to the data sheet on that page, too!

I hope this helps and someone will be able to test these discoveries in the code.

Thanks a lot!

[Bagder]

PortalPlayer and Nvidia never revealed any data sheets for any portalplayer chip in the past so I'd say the chances are very slim that they would for this particular version all of a sudden.

I must admit my memory is degrading here, but I can't recall if anyone ever tried to run a custom modified View firmware (like with a string changed) just to verify that the bootloader DSA-signature flaw is still present.

[saratoga]

I must admit my memory is degrading here, but I can't recall if anyone ever tried to run a custom modified View firmware (like with a string changed) just to verify that the bootloader DSA-signature flaw is still present.

Indeed someone has:

http://forums.rockbox.org/index.php?topic=13562.msg127955#msg127955