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dm38x sd无法启动



使用的是3.9.1 的ipnc_rdk , 直接配置为

SYSTEM_PLATFORM  := CSK

# Build configuration
#APP_BUILD_CFG    := debug
APP_BUILD_CFG   := release

# Binary to boot from NAND or SDCARD  , default is sd
#BINARY_MODE   := nand
BINARY_MODE   := sd
# Choose the target platform that is needed
# Values are "DM388" and "DM8127"
IPNC_DEVICE    := DM388
#IPNC_DEVICE    := DM8127

# Values are "LOW_POWER" and "FULL_FEATURE"
#IPNC_CONFIG := FULL_FEATURE
IPNC_CONFIG := LOW_POWER

# Memory foot print
MEMORY_CONFIG := 512MB

IMGS_ID := IMGS_MICRON_AR0331
然后直接make sys 
生成 dm38x-csk.dtb MLO  u-boot.img  uImage  用脚本mksd-ti81xx.sh
 写入到sd 卡后 设备无法启动。串口无任何输出。
问题: 1 、uboot中是否需要配置dts ?
            2、dm38x的PLL配置CONFIG_DDR_533_MHZ宏定义文件 config.h是一个自动生成的,
无法更改,请问哪里可以修改为400MHZ ,
            3、uboot的第一阶段貌似都没有起来,请问一下解决思路。