April
14
64Mb Didj mod
I have killed a Didj but upgraded one for science today!
pin pulled up when I removed the old chip, will be very hard to fix…
Second attempt was perfect :)
675-1022-1-ND is the part number from Digikey I used
then after I put everything together I forgot there was a resister that needed to be changed.
PVD[6] is the blue resistor on the left
PVD[7] is the resistor that needs to be moved
the one with the arrow needs to be moved to the other location
This sets the capacity of the DDR-SDRAM IC connected to the MCU-Y DDR memory bank.
2 ‘ b 00 : 64Mbit
2 ‘ b 01 : 128Mbit
2 ‘ b 10 : 256Mbit
2 ‘ b 11 : 512Mbit
Once that is set you need to hex edit your Lighting boot to change the kernel command line.
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Wow thats pretty nice im really tempted to buy one of these now :) Can you feel any difference after upgrading?
A tip for removing pesky SMT components – cover the area in aluminum foil, and cut out a hole for the part you’re removing. Grab two sides of the chip/part with self-closing tweezers – leave it hanging so that it pulls upward slightly on the chip. Blast the area with a hot air gun, wait… and POP! out goes the chip!
I’ve used this trick successfully dozens of times and have yet to damage anything. Fixing broken pads is a major pain in the ***.
Wounldn’t it be possible to upgrade to 512Mb any reason not to? More Power required? or expense?
The maximum ram that the Didj can handle is 128mb, To do that would require two 8x chips from the 16x chip and a lot of pin swapping.
In theory you could add another 64mb chip and use one of the Gpio from the buttons for chip select but it might be un-sable
There just isn’t enough chip select pins :(
So, then we are limited to 64mb SD cards ? Will larger one work and just show 64 as usable ? Or are they useless ?
The 64 MB limit refers to the DDR memory.
With the Micro Sd cards I have tested up to 4gb so far with no problems. I believe someone had a 8 gig working.