[U-Boot] [ppc440epx : memory extention]

[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)

[U-Boot] [ppc440epx : memory extention]

[Stefan Roese]

On Tuesday 16 September 2008, sean wrote:
> I'd like to extend capacity of DDR2 memory from 256MB to 512MB on my
> custumn board.

So you have a custom board port for your specific board, correct? Is the DDR2 
hardware design similar to the one on Sequoia? What are the differences here?

> 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)

Yes.

> 2)     Sdram.c
>
>            /* For 512M DDR Registers */
>
>            mtsdram(DDR0_02, 0x00000000);

<snip>

Can't comment here. This is really complex and pretty board/DDR2 specific.

> 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)

Yes, you need to add another TLB entry for the 2nd 256MB. Or you could remove 
those entries completely and use program_tlb() to add the TLB(s).

Best regards,
Stefan

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