[U-Boot] new board SDRAM conf

[Stefan Roese <sr@denx.de>]

On Monday 03 November 2008, ??? wrote:
> I create  My own board port(MFT board) . create configuration header and
> init.S But In the sdram.c(sdram_init->get_ram_size is 4 thus )func is
> failed , sdram is not founded . I think init.S is something wrong or
> CFG_MONITOR_BASE is  wrong ... .
>
> maybe you can point me to the right direction.
>
> It's my board init.S

Your init.S is not optimal but at least not the reason for the problem. You 
are programming a 256MB TLB entry for SDRAM. This is more than enough for 
your 128MB. You should fix this at some time but it not the problem right 
now. CFG_MONITOR_BASE is also most likely not the problem.

<snip>

> My SDRAM is  128MB mode 3, 13x10(4)
> And use external DDR_SDRAM Bank_0(BANKSEL_0)

OK.

<snip>

> /*-----------------------------------------------------------------------
>  * DDR SDRAM
>  *----------------------------------------------------------------------*/
> #undef CONFIG_SPD_EEPROM		/* Don't use SPD EEPROM for setup	*/
> #define CONFIG_SDRAM_BANK0	1	/* init onboard DDR SDRAM bank 0*/
> #define	CFG_SDRAM0_TR0		0x410A4012
> #undef CONFIG_SDRAM_ECC		/* enable ECC support		*/
>
> #if 1
> #define CFG_SDRAM_TABLE	{ \
> 		{(128 << 20), 13, 0x000A4001}, /* 128MB mode 3, 13x10(4)*/ \
> 		{(128 << 20), 12, 0x000A2001}, /* 128MB mode 2, 13x10(4)*/ \
> 		{(64 << 20),  13, 0x00084001}, /* 64MB mode 3, 13x9(4)	*/ \
> 		{(64 << 20),  12, 0x00082001}, } /* 64MB mode 2, 13x9(4)	*

Why do you define so many entries in this table? One (128MB mode 3) should be 
enough for you. If get_ram_size() doesn't return 128MB in this init function 
then you need to check whether you have a problems with the timings. Use a 
debugger (or test routines) to see if some bits fail etc.

Best regards,
Stefan

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