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DDR3 is 2GB?



Hi all 

In Mistral 8148 EVM board, have 8pcs DDR3(MT41J128M8JP-125) on two banks(DDR0, DDR1), the total size is 1G bytes.

but when I power on the EVM, the u-boot report DDR3 information is DRAM:  2 GiB, why?

//-----------------------------------------------------------------

U-Boot 2010.06 (Oct 10 2012 - 14:08:25)

TI8148-GP rev 2.1

ARM clk: 600MHz
DDR clk: 400MHz

DRAM: 2 GiB
NAND: HW ECC BCH8 Selected
256 MiB
Using default environment

The 2nd stage U-Boot will now be auto-loaded
Please do not interrupt the countdown till TI8148_EVM prompt if 2nd stage is already flashed
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x20000, size 0x40000
262144 bytes read: OK
## Starting application at 0x81000000 ...