cfi probe for two different flash devices

cfi probe for two different flash devices

[J.Murali]

hi all,

i am working on a custom board(Redwood6) using IBM ppc 405. I am using
the Montavista's kernel 2.4.17. We have one AMD flash of 4 MB and one
Intel flash of 16 MB on our board. There are 4 mtd partitions are in AMD
and Intel flash is used as storage space of 5 mtd partition.

AMD partitions
-----------------
1. Bootparams
2. Bootldr
3. kernel
4. Filesystem1

Intel partition
--------------
5. Filesystem2

In the CFI probe, the kernel detects only one flash either AMD or INTEL
(Which address we specify as window address). What i have to to do for
cfi to detect both flash devices.

Any suggestions are appreciated

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Re: cfi probe for two different flash devices

[Gary Thomas]

On Mon, 2003-10-06 at 00:20, J.Murali wrote:
> hi all,
>
> i am working on a custom board(Redwood6) using IBM ppc 405. I am using
> the Montavista's kernel 2.4.17. We have one AMD flash of 4 MB and one
> Intel flash of 16 MB on our board. There are 4 mtd partitions are in AMD
> and Intel flash is used as storage space of 5 mtd partition.
>
> AMD partitions
> -----------------
> 1. Bootparams
> 2. Bootldr
> 3. kernel
> 4. Filesystem1
>
> Intel partition
> --------------
> 5. Filesystem2
>
> In the CFI probe, the kernel detects only one flash either AMD or INTEL
> (Which address we specify as window address). What i have to to do for
> cfi to detect both flash devices.
>
> Any suggestions are appreciated
>

This question would be best asked of the MTD folks (cc'd), but I think
you'll need a customized "map" function that recognizes these two FLASH
device types and creates the appropriate MTD sub-devices appropriately.

--
Gary Thomas <gary@mlbassoc.com>
MLB Associates


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Re: cfi probe for two different flash devices

[David Woodhouse]

On Mon, 2003-10-06 at 11:10 -0600, Gary Thomas wrote:
> This question would be best asked of the MTD folks (cc'd), but I think
> you'll need a customized "map" function that recognizes these two FLASH
> device types and creates the appropriate MTD sub-devices appropriately.

What Gary said.

If you poke around in drivers/mtd/maps you'll find useful examples of
such, including how to concatenate them together into one logical MTD
device and have a file system spanning them both, etc.

--
dwmw2


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RE: cfi probe for two different flash devices

[Rod Boyce]

In fact is was so easy that I went from knowing of the existence of the
MTD subsystem to booting a Linux kernel and file-system on a custom map
in 2 days. You MTD guys have done a fantastic job.

Regards,
Rod Boyce.

PS sorry for the wasted channel space but I had to say something.

> -----Original Message-----
> From: David Woodhouse [mailto:dwmw2@infradead.org]
> Sent: Tuesday, 7 October 2003 6:16 a.m.
> Subject: Re: cfi probe for two different flash devices
>
> On Mon, 2003-10-06 at 11:10 -0600, Gary Thomas wrote:
> > This question would be best asked of the MTD folks (cc'd), but I
> > think you'll need a customized "map" function that recognizes these
> > two FLASH device types and creates the appropriate MTD sub-devices
> > appropriately.
>
> What Gary said.
>
> If you poke around in drivers/mtd/maps you'll find useful examples of
> such, including how to concatenate them together into one logical MTD
> device and have a file system spanning them both, etc.

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/