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PRTCSS power on DM368

hi,

   I have a strange problem on DM368,when power on DM368,sometimes it can not boot up,we try change the POWER ON sequence about(1.3V/1.8V/3.3V),but it have no effect,(by the way,we power supply  PRTCSS  and Core with the same DC-DC at the same time).

      at last,we remove the  PRTCSS  power(DM368 pin K7,J6floatting),then the DM368 work fine,I want to know why the PRTCSS affect the boot up ? after remove PRTCSS power,we have another problem,when we set BTSEL[2:0]=010(SD BOOT modes), it can  not boot from SD_Card but NANDfLASH directly,and when we recover PRTCSS power,set BTSEL[2:0]=010,it can boot from SD_Card, Why?

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