I have tried to configure PortX for use of memory  space 0x7000_0000.  I have modified MCCR4[EXTROM] to  enable entened ROM.

but i can't accessed address 0x70000000 ...

i find something worng in include/config_Sandpint8245.h

according to define BATs in config_Sandpint8245.h

not allocate BATs for address 0x7000000 , so i try change BAT1 for extended rom

i modify ppcboot code to blow list

 

1. 0x40000000 used by initial stack , until sdram init....(BAT1 allocation)

2. command/board.c : board_init_r () this function use stack...in ram so no more need 0x40000000

3. my added code to BAT1 realloction for 0x70000000.. 

    void move_bat1 (void)
    {
    mtspr (IBAT1L, (0x70000000 | BATL_PP_10 | BATL_CACHEINHIBIT));
    mtspr (IBAT1U, (0x70000000 | BATU_BL_256M | BATU_VS | BATU_VP));

    mtspr (DBAT1L, (0x70000000 | BATL_PP_10 | BATL_CACHEINHIBIT));
    mtspr (DBAT1U, (0x70000000 | BATU_BL_256M | BATU_VS | BATU_VP));
    __asm__ __volatile__("eieio");
    __asm__ __volatile__("isync");
    __asm__ __volatile__("sync");

}

 

4. call move_bat1 at board_init_r ......

 

but...board not working.....