RM48L952: Read/write issue using SDRAM

more info about what is occurring from my programmer....

from my programmer:  first write is ok, subsequent writes overwrites good data with zeros.

Writing to a 8-bit variable located in external memory and then reading it back gives an incorrect value:

This code:

       volatile unsigned char *ptr = ((volatile unsigned char *)0x80000000U);

UARTprintf("Byte test\n");

ptr[0] = (unsigned char)0x12;

UARTprintf("ptr[0] = 0x%02x\n", ptr[0]);

ptr[1] = (unsigned char)0x34;

UARTprintf("ptr[1] = 0x%02x\n", ptr[1]);

ptr[2] = (unsigned char)0x56;

UARTprintf("ptr[2] = 0x%02x\n", ptr[2]);

ptr[3] = (unsigned char)0x78;

UARTprintf("ptr[3] = 0x%02x\n", ptr[3]);

ptr[4] = (unsigned char)0x9a;

UARTprintf("ptr[4] = 0x%02x\n", ptr[4]);

ptr[5] = (unsigned char)0xbc;

UARTprintf("ptr[5] = 0x%02x\n", ptr[5]);

ptr[6] = (unsigned char)0xde;

UARTprintf("ptr[6] = 0x%02x\n", ptr[6]);

ptr[7] = (unsigned char)0xf0;

UARTprintf("ptr[7] = 0x%02x\n", ptr[7]);

Prints out:

Byte test

ptr[0] = 0x00

ptr[1] = 0x00

ptr[2] = 0x12

ptr[3] = 0x34

ptr[4] = 0x00

ptr[5] = 0x00

ptr[6] = 0x9a

ptr[7] = 0xbc

Hello Mike,

1. Are EMIF DQM signals are used to enable the byte access?

2. Please use device mode or strong-ordered mode for EMIF SDRAM  using MPU

3. Please lower your EMIF clock: