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... ;P
bye

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