12:21 <Halftux> hi joerg do you know if it is possible to replace the 256mb ram from N900 with 512mb? I have seen that there is one 128mb Numonyx M39L0R7070 chip inside. From where comes the other 128mb?

12:55 <Halftux> Could it be possible to solder the M39L0R8090 ?

14:43 <drathir> not sure but there was soc limitation if good remember i guess...

14:47 <Joerg-Neo900> Hi Halftux! the N900 has 256MB (no idea where from you have the 128MB info) PoP on CPU, theoretically you could upgrade this to 1GB like we did on the BB-xM. But it's *very* demanding and we killed a few boards to get one that worked. TI PoP isn't meant to get disassembled once you "married" the CPU with the PoP-Top

14:48 <Joerg-Neo900> drathir: the limit was "2 banks a 512MB" for OMAP3

14:49 <drathir> Joerg-Neo900: oh than wrong remember...

14:51 <Joerg-Neo900> KCE00E00CA is the 1GB RAM PoP chip we sourced

14:51 <drathir> Joerg-Neo900: im wonder how about power consumption of such upgrade? mean i n900 is any visable ?

14:52 <Joerg-Neo900> three guys received chips for free to pimp their N900, none of them reported back - I don't know if they all killed themselves during the endeavor or were simply too embarrassed of the total failure

14:53 <drathir> oh... thats scary...

14:53 <Joerg-Neo900> drathir: the 1GB chip needs negligibly more power than the 236MB

14:54 <Joerg-Neo900> I guess if one of those guys had succeeded to pimp a N900 they came bragging, no?

14:59 <Joerg-Neo900> http://talk.maemo.org/showthread.php?p=1442609&highlight=KCE00E00CA#post1442609 http://talk.maemo.org/showthread.php?p=1467952&highlight=KCE00E00CA#post1467952

15:01 <Joerg-Neo900> atk: http://wstaw.org/m/2015/04/29/plasma-desktoptw1950.png

15:01 <Joerg-Neo900> back from http://talk.maemo.org/showpost.php?p=1468824&postcount=2396

15:02 <Joerg-Neo900> Halftux: http://talk.maemo.org/showthread.php?p=1467283

15:03 <Joerg-Neo900> Halftux: http://talk.maemo.org/showthread.php?p=1466445

15:07 <Joerg-Neo900> please rephrase

15:08 <Halftux> Thank you for the links. the n900 chip has 128mb flash and 128mb lpddr according to the datasheet and number on the chip so in total 256mb? and there is another configuration with 256mb flash and 512mb lddr?

15:09 <Joerg-Neo900> N900 has 256MB RAM and those are in PoP

15:10 <Joerg-Neo900> KCE00E00CA has 1024MB RAM + iirc 512MB NAND

15:16 <Joerg-Neo900> drathir: could you please rephrase your question?

15:26 <Halftux> So after removing the old chip I need to seperate the cpu and soldering the new ram onto it and then soldering the pop to the pcb

15:33 <Halftux> So I could get access to SMT/BGA Rework machines and also a reball machine. http://www.finetech.de/advanced-rework/applications/package-on-package-pop.html

15:40 <drathir> Joerg-Neo900: sure i have on mean if similar rules apply when You chose ram to mobile platforms configurations as phones eg. in way ram must be supported by cpy and motherboard used in phone ?

15:52 <drathir> cpy/cpu*

19:55 <Halftux> So I had a closer look at your N900 block diagram and first I was refering to the wrong chip. I had wrong information from the internet, there is also written that the samsung chip has 2GB. So the KAT00F00DD-AE77 needs to be replaced with the KCE00E00CA and it is sitting on top of the omap, so to say a South-Korea-USA pop with South-Korea on top (popt).