nxp，您好！imx8mp 板子上连接MT53E1536M32D4DT-046 WT:A，6G lpddr，uboot启动起来就死了，只打印几行，我的操作步骤如下：
1.下载MX8M_Plus_LPDDR4_RPA_v9.xlsx，打开此文件，复制出ddr stress test file,保存为ddr1.ds
2.下载mscale_ddr_tool_v3.31，运行MSCALE_DDR_Tool.exe，load ddr script选择ddr1.ds,连上串口，点击download按钮，串口打印出ddr信息。点击calibration,format选择array,点击Gen Code按钮，生成lpddr4_timing.c
3.把lpddr4_timing.c拷贝到uboot的board/freescale/imx8mp_evk目录下，
4.make imx8mp_ddr4_evk_defconfig， make menuconfig，arm architecture-->nxp i.mx8M board select,选择imx8mp lpddr4 evk。device drivers-->i.mx8 ddr controler ，去除imx8 ddr4。然后make all -j16,生成 uboot
5.切换到imx8mp/imx-mkimage/src/imx-mkimage目录下，
cp /home/jimmy/share/imx8_6g/uboot/u-boot-nodtb.bin /home/jimmy/share/imx8_6g/imx8mp/imx-mkimage/src/imx-mkimage/iMX8M/ -v
cp /home/jimmy/share/imx8_6g/uboot/spl/u-boot-spl.bin /home/jimmy/share/imx8_6g/imx8mp/imx-mkimage/src/imx-mkimage/iMX8M/ -v
cp /home/jimmy/share/imx8_6g/uboot/arch/arm/dts/imx8mp-ddr4-evk.dtb /home/jimmy/share/imx8_6g/imx8mp/imx-mkimage/src/imx-mkimage/iMX8M/ -v
cp /home/jimmy/share/imx8_6g/uboot/tools/mkimage /home/jimmy/share/imx8_6g/imx8mp/imx-mkimage/src/imx-mkimage/iMX8M/ -v
make SOC=iMX8MP clean
make SOC=iMX8MP flash_ddr4_evk
生成flash.bin
6.SD卡连上电脑，dd if=flash.bin of=/dev/sdb bs=1k seek=32.
7.板子切换到sd卡启动模式，启动，串口打印信息如下：
U-Boot SPL 2022.04 (Jan 06 2024 - 21:18:52 -0800)
DDRINFO: start DRAM init
DDRINFO: DRAM rate 4000MTS
DDRINFO:ddrphy calibration done
DDRINFO: ddrmix config done
只打这几行字符串，uboot就死在这里了，我是哪里出错了，ddr初始化好像成功了，bl31.bin要改吗？uboot的dts需不需要改动？
