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Re: [Redboot] SDRAM size and ixp425


On Thu, 2005-03-03 at 18:37 +0800, David Lu wrote:
> Thank your for your reply.
> 
> But in the ixdp425.h Line 80: #define IXP425_SDRAM_CONFIG_INIT 
> (SDRAM_CONFIG_CAS_3 | SDRAM_CONFIG_2x8Mx16)
> 
> in Hal_ixp425.h
> // SDRAM_CONFIG bits
> #define SDRAM_CONFIG_2x8Mx16       0
> #define SDRAM_CONFIG_4x8Mx16       1
> #define SDRAM_CONFIG_2x16Mx16      2
> #define SDRAM_CONFIG_4x16Mx16      3
> #define SDRAM_CONFIG_2x32Mx16      4
> #define SDRAM_CONFIG_4x32Mx16      5
> 
> It seems that it does not support 1x4Mx32. But in the h/w design in the 
> Intel's document, the 1x4Mx32 can be supported.

Which document are you looking at? My copy of the IXP425 T-Spec shows
the above list as the only valid options. The SDRAM_CONFIG field of the
memory controller config register is only 3 bits and values 6 and 7 are
reserved.

--Mark



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