8-bit mtd flash support

8-bit mtd flash support

[Shamile Khan]

hi,

I am faced with a situation where my processor is connected
to 1 NOR flash chip in 8-bit mode. Now the consequence of
this is that I cannot excute code directly from flash. I am
not concerned about the performance penalties at this point
as I believe in the next rev of our board this problem
should be fixed in hardware.(i.e. 32 bit access to flash).
I was wondering if
a) Its a valid concept to have a Linux mtd flash filesystem
where the flash chip only allows 8-bit access
b) anyone else has been in this situation and
c) if there are mtd drivers available for 8-bit access to a
flash chip.

Regards,
Shamile


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Re: 8-bit mtd flash support

[Wolfgang Denk]

In message <20040120011332.12136.qmail@web11601.mail.yahoo.com> you wrote:
>
> I am faced with a situation where my processor is connected
> to 1 NOR flash chip in 8-bit mode. Now the consequence of
> this is that I cannot excute code directly from flash. I am

Why not? You should be able to configure your processor to use a  bus
width of 8 bit for the flash device.

> I was wondering if
> a) Its a valid concept to have a Linux mtd flash filesystem
> where the flash chip only allows 8-bit access

Yes.

> b) anyone else has been in this situation and

Yes.

> c) if there are mtd drivers available for 8-bit access to a
> flash chip.

Yes.

All this is in place and working.

Best regards,

Wolfgang Denk

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