BBB with 1GB DDR3

I have a couple of BBB boards (rev. C) where the original 512MB DDR3 chip (Micron MT41K256M16HA-125:E) was removed and replaced with a new one with 1GB capacity (Micron MT41K512M16HA-125:E).
The only difference between the chips are the number of row address lines (15 for 512MB chip, 16 for 1GB chip).
In order to have the system to handle the full memory I know I have to change the setting of the SDRAM_CONFIG register, reg_rowsize field from actual 6 to 7.
I have to change the SDRAM_CONFIG register from the actual 0x61C05332 to 0x61C053B2

I’ve find the 0x61C05332 constant into the MLO file (there’s only one into the file and also it’s very close to the other constants used to initialize the other EMIF registers so I’m very confident that it’s really it).I’m just wondering if I could, simply, directly edit the content of the MLO file… without recompiling all the boot enviroment.

Can this work? or has the MLO file some checksum also?

I don’t need a new brick… :stuck_out_tongue_winking_eye:
bye

Hi Gianfranco,

did you succeeded with adding 1G of SDRAM to your BBB? I’m fighting with similar problem but different chip. Thanks.

BR,

marek

Dňa piatok, 26. júna 2015 11:32:36 UTC+2 Gianfranco Rosso napísal(-a):

Hello Marek,

to be honest, I really don’t remember if it was succesfull.
For sure I can tell you that we didn’t got any bricked boards… so at least the board with 1G ram was working anyway (maybe using only 512M as the original configuration).
It’s also possilbe that the BBBs auto recognized the new size and made it available without making any change to configuration…

Anyway few days later we found a supplier (www.specialcomp.com) that provide us BBB boards with 1G natively installed (non reworked) and also in industrial temperature range, we use those.

bye

Hi,

do you remember by any chance which RAM chips was used? Thanks.

BR,

marek

Hello Marek,

we used Micron MT41K512M16HA-125:E (that was from the same family of original memory chip, just with double capacity…)

bye