[U-Boot] [ppc440epx : memory extention]

[sean]

I'd like to extend capacity of DDR2 memory from 256MB to 512MB on my custumn
board.

EV Board(SEQUOIA) has 256MB DDR2 memory.

 

When I reset the U-Boot program, U-boot show me the SDRAM test fail message
like below.

 

DRAM: 512MB

SDRAM test fails at : 00000000

 

What should I do to upgrade DDR2 memory??

I have only modified follow sessions of U-Boot Code. Is it right??

1)     Sequoia.h

#define CFG_MBYTES_SDRAM        (512)

2)     Sdram.c

           /* For 512M DDR Registers */

           mtsdram(DDR0_02, 0x00000000);

 

           mtsdram(DDR0_00, 0x0000190A);

           mtsdram(DDR0_01, 0x01000000);

           mtsdram(DDR0_03, 0x02050A02);

           mtsdram(DDR0_04, 0x08020100);

           mtsdram(DDR0_05, 0x02020206);

           mtsdram(DDR0_06, 0x0102C811);

           mtsdram(DDR0_07, 0x00070100);

           mtsdram(DDR0_08, 0x04c80001);

           mtsdram(DDR0_09, 0x00011D5F);

           mtsdram(DDR0_10, 0x00000300);

           mtsdram(DDR0_11, 0x0013C800);

           mtsdram(DDR0_12, 0x00000003);

           mtsdram(DDR0_14, 0x00000000);

           mtsdram(DDR0_17, 0x19000000);

           mtsdram(DDR0_18, 0x19191919);

           mtsdram(DDR0_19, 0x19191919);

           mtsdram(DDR0_20, 0x0B0B0B0B);

           mtsdram(DDR0_21, 0x0B0B0B0B);

           mtsdram(DDR0_22, 0x00267F0B);

           mtsdram(DDR0_23, 0x00000000);

           mtsdram(DDR0_24, 0x01010002);

           mtsdram(DDR0_26, 0x246e0408);

           mtsdram(DDR0_27, 0x0000682B);

           mtsdram(DDR0_28, 0x00000000);

           mtsdram(DDR0_31, 0x00000000);

           mtsdram(DDR0_42, 0x0100000A);

           mtsdram(DDR0_43, 0x020A0201);

           mtsdram(DDR0_44, 0x00000002);

           mtsdram(DDR0_02, 0x00000001);

 

 

And should I modify on table entry(in init.s)

tlbentry( CFG_SDRAM_BASE, SZ_256M, CFG_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G)