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Can DDR2 Frequency of dm6446 run up to 270MHz?

Dear all,

I boot my board by Nand flash. It works fine when the DDR2 freq is 162MHz.

I changed the PLL setting of DDR2 in the ubl to the below:

PLL Multiplier   --   20

PLL Frequency (MHZ)    --  540

Divider Ratio   --   1

PLL2_SYSCLK2 Frequency (MHZ)   --       540

DDR2 Clock     --  270

Some boards can work and the others can't.  Does anybody know the reason? Maybe I need to change the DDR2 setting at the same time? If so, what  DDR2 regs value should be setted?

Any clue is appreciated.

Wei Jiang