In a long discussion JDark convinced me that lost RAM is a software problem and everything is soldered correctly. I've smoked the intel manual, decompiled SPL - and found the reason - bootloader initializes timings only for the first 64-Mb memory bank! So when you access the second bank on stacked chips - you get just a garbage. Patching bootloader is a dangerous task, so i had to patch nk.exe. The second bug was in NK. As you know the last 1 mb of first 64Mb RAM is used for framebuffer, so we get a "hole" if we have 128 Mb RAM. Had to fix that too.

The test ROM is ready, but it is now too early to release it to public - the device hangs on exiting from sleep mode, but this could be fixed.


So to make 128Mb RAM working you'll need to solder chips, shorten CS1 as showed on the picture (other pins should be left as they are):

and flash a ROM when I'll publish it.

The ROM would be incompatible with G4 devices as long time ago I've broken something in my patches and don't have G4 to find what to fix. I need a person who has a G4 device and knows how to use KITL.

Now Universal has 112.44 Mb total RAM available to OS.

Originally Posted by mamaich

In a long discussion JDark convinced me that lost RAM is a software problem and everything is soldered correctly. I've smoked the intel manual, decompiled SPL - and found the reason - bootloader initializes timings only for the first 64-Mb memory bank! So when you access the second bank on stacked chips - you get just a garbage. Patching bootloader is a dangerous task, so i had to patch nk.exe. The second bug was in NK. As you know the last 1 mb of first 64Mb RAM is used for framebuffer, so we get a "hole" if we have 128 Mb RAM. Had to fix that too.

The test ROM is ready, but it is now too early to release it to public - the device hangs on exiting from sleep mode, but this could be fixed.


So to make 128Mb RAM working you'll need to solder chips, shorten CS1 as showed on the picture (other pins should be left as they are):

and flash a ROM when I'll publish it.

The ROM would be incompatible with G4 devices as long time ago I've broken something in my patches and don't have G4 to find what to fix. I need a person who has a G4 device and knows how to use KITL.

Now Universal has 112.44 Mb total RAM available to OS.

Hi Mamaich,


Congrats on another amazing piece of work, your work never ceases to amaze me.

What do you need from KITL?
I have a G4 Uni, let me know if I can help.
G4 Boot with KITL output attached, hope it helps.

Cheers,


Beasty

Originally Posted by beast0898

What do you need from KITL?

I need you to flash a ROM that is incompatible with G4 devices - it was posted somewhere on the forum, and send KITL output from it so i'll find where it would hang

a screenshot:

Congratulations!

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Hi, Congratulations on your discovery! I have always been amazed and appreciated by the energy and efforts that have been put into making this great device even greater.

The Universal with 128mb memory would become highly desirable and usable. This would substantially extend its usage life. Hope this eventually becomes available for all generations of the Universals.

Btw, how do you find the battery life issue once you've got the 128mb ram? Is it a real drain on the power?

Please keep up good hard work & Regards,

McToey

Congratulations

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Well done. Congratulations for your great work.

Thank you very much.

Now the only thing we need is a person/company who can order and solder those chips

Wiki page added

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Ok i have added a wiki page:

http://wiki.xda-developers.com/index...ersal_128MBRAM

Where to buy Infineon HYB25L512160AC-7.5 Chip?

Originally Posted by mamaich

I need you to flash a ROM that is incompatible with G4 devices - it was posted somewhere on the forum, and send KITL output from it so i'll find where it would hang

Hi Mamaich,

Any ideas where this Rom is?

I've searched to no avail.

If someone can provide a link to the Rom, I'll flash. KITL and post results back.


Cheers,


Beasty