it's a long term problem.
we designed our board base on c6670evm,build the ibl/linux and so on.but the board cannot booting linux sometimes,it just stopped at "booting from nor"(we select nor flash as our boot device).
We change the boot mode to nand flash,ethernet with the same image,it still had the unusual stopping.
First we check the power of the board,the ripples we made it to 20mv,it's good enought for these chips.
When ibl read linux from flash, we caculated the chechsum of the linux image before it beginning boot,the checksum is right,also i print a part of memory of linux which place at the head and the tail,it just right.
Then before ibl copy linux from nor flash,we first do a memory writing and reading on ddr3 memory(512MB),then calculated the checksum,it still right.
Then we change the ddr3's initial parameters,we calculated it with our ddr3's spec by the Excel calculate tool provided by TI.we give the clock to ddr3 is 62.5MHz,so the pll output frequence is 1250MHz,not 1333MHz.we made two group parameters based on 1250MHz and 1333MHz,they act as the same.If we change parameters based on1066MHz,but the input clock is still 62.5MHz,it will make the board always stop booting.
the frequence of the system can't booting is about 1/50,all of the board had the problem,some may worse.
what happened to the system booting?