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)