Flash mapped to lower address?

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Re: Flash mapped to lower address?

Devi Priya

22 Dec 2003 22 Dec '03

10:01 p.m.

If i have my Flash memory mapped to the lower address (0x0000-0x3FFFFF), then what modification should be made to linux bios?

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ebiederman＠lnxi.com

23 Dec 23 Dec

12:29 p.m.

"Devi Priya" ijpriya@hotmail.com writes:

...

If i have my Flash memory mapped to the lower address (0x0000-0x3FFFFF), then what modification should be made to linux bios?

If this is x86 and that is your only flash address then you can't boot. x86 cpus start at address 0xfffffff0. Unless there are some embedded variants I am not familiar with.

If this is ARM where flash is normally mapped to 0 that makes sense but currently we don't have an arm port. I don't think it would be too difficult though.

So I really can't answer without more information.

Eric

ron minnich

24 Dec 24 Dec

8:35 p.m.

On Tue, 23 Dec 2003, Devi Priya wrote:

...

If i have my Flash memory mapped to the lower address (0x0000-0x3FFFFF), then what modification should be made to linux bios?

why on earth would you map flash to this address? it makes no sense to me.

ron

Bari Ari

25 Dec 25 Dec

7:39 p.m.

Devi Priya wrote:

...

If i have my Flash memory mapped to the lower address (0x0000-0x3FFFFF), then what modification should be made to linux bios?

If you have you Flash mapped to 0x0000 - 0x3FFFF then you can't use your Flash as a Boot Device since the "SCx200 Core Logic module positively decodes memory addresses 000F0000h-000FFFFFh (64 KB) and FFFC0000h-FFFFFFFFh (256 KB) at reset".

Why don't you just get the application note "AMD Geode™ SC1200/SC2200/ SC3200 Processors: External NAND Flash Memory Circuit" and the Geode data sheet from AMD? They explain how all this works.

-Bari