Local sdram in 8260 board

Local sdram in 8260 board

[zzh]

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      Hi,I try to make 60x sdram and the local sdram a continuous
20M ram area to accommodate a 8M ramdisk in the motorola 8260 ads board.When it load the initrd,it will get machine check exception
at address 0x1000004 which is in the local sdram.When i disable the
cache ,it will work. Does local sdram noncacheble?How should i
fix it?

davidzhang
7/13/2000


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Re: Local sdram in 8260 board

[Dan Malek]

zzh wrote:

> ...it will get machine check exception
> at address 0x1000004 which is in the local sdram.When i disable the
> cache ,it will work.


It sounds like something is wrong with your memory controller
configuration.  The cache enable/disable also affect the type of
bus cycles that are used to access memory.


	-- Dan

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Re: Local sdram in 8260 board

[Andrew W. Reynolds]

This could be the setup of the SDRAM control word. When the cache is enabled it
begins bursting data from the SDRAM. When the SDRAM control word is not set to
burst 32 bytes it will cause the memory exception.

Dan Malek wrote:

> zzh wrote:
>
> > ...it will get machine check exception
> > at address 0x1000004 which is in the local sdram.When i disable the
> > cache ,it will work.
>
> It sounds like something is wrong with your memory controller
> configuration.  The cache enable/disable also affect the type of
> bus cycles that are used to access memory.
>
>         -- Dan
>


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