[U-Boot-Users] SDRAM and DRAM mapping on FADS

[Wolfgang Denk]

In message <3FDA9E80.000010.12071 at bjapp11> you wrote:
>
> With these settings, bank 2 is mapped to 0x00000000~0x00ffffff, bank
> 3 is mapped to 0x01800000~0x01ffffff. This is not the desired
> mapping. The desired mapping is: 0x00800000~(0x01800000-1) => bank2,

So change the mapping as desired.

> 0x01800000~(0x02800000-1) => bank3. But I don't think we can get
> this mapping by setting BR/OR2 and BR3/OR3 with appropriate values.

What makes you think so?

> So I think DRAM should be mapped at address 0 and SDRAM follows if
> the DRAM size is 16MB or 32MB.

You can define any mapping you like. This is  done  in  software,  so
feel free to implrement whichever mapping makes sense.

> Is my understanding correct?

I don;t know. You did not explain why you think this or that.

> --Boundary-=_AEdPcDyxqrbEmaHUPRnUdWsXLQqh
> Content-Type: text/html; charset="gb2312"
> Content-Transfer-Encoding: 8bit

Arrrgh. Never post HTML, please.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Objects in mirror are closer than they appear.