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关于ddr时序的调整可以参考:
http://processors.wiki.ti.com/index.php/File:DM813x_DDR_Controller_Register_Configuration_spreadsheet_v1.0.zip
uboot的配置
http://processors.wiki.ti.com/index.php/TI813x-DDR3-Init-U-Boot
http://processors.wiki.ti.com/index.php/TI81XX_PSP_UBOOT_User_Guide