本人现在绘制了一块H618的开发板，使用DDR3做为DRAM，现在看到野火家的鲁班猫A0使用的是DDR4，找到了有关ddr的相关定义：
dram_clk = 600
dram_type = 8
dram_dx_odt = 0x07070707
dram_dx_dri = 0x0e0e0e0e
dram_ca_dri = 0x0e0e
dram_odt_en = 0xaaaaeeee
dram_para1 = 0x30fa
dram_para2 = 0x0000
dram_mr0 = 0x0
dram_mr1 = 0x34
dram_mr2 = 0x1b
dram_mr3 = 0x33
dram_mr4 = 0x3
dram_mr5 = 0x0
dram_mr6 = 0x0
dram_mr11 = 0x04
dram_mr12 = 0x72
dram_mr13 = 0x0
dram_mr14 = 0x9
dram_mr16 = 0x0
dram_mr17 = 0x0
dram_mr22 = 0x24
dram_tpr0 = 0x0
dram_tpr1 = 0x0
dram_tpr2 = 0x0
dram_tpr3 = 0x0
dram_tpr6 = 0x48808080
dram_tpr10 = 0x402f6663
dram_tpr11 = 0x36363535
dram_tpr12 = 0x10101110
dram_tpr13 = 0xC60
现在想改为使用的DDR3的，请问如何修改，有相关教程嘛？
使用的DDR3型号为：MT41K128M16JT-125 IT:K110.4.0110，2Gb_DDR3_SDRAM.pdf