Getting mtd to work with IBM Evaluation boards (Ebony/Walnut)

Getting mtd to work with IBM Evaluation boards (Ebony/Walnut)

[Chan Siu Ming]

Hello,
I'm trying to get mtd to work with IBM Walnut and
Ebony PPC evaluation boards. I tried with mtd CVS
from 2004.11.03 and Linux 2.6.9, but seem to have
some problems. Here's first what I did do with 
success:
* patched kernel with CVS mtd and compiled it, 
  everything into the kernel - no modules. I'm
  not quite sure what I should have enabled in
  the config, but I guess these boards have CFI
  AMD chips in them.
* populated /dev with the MAKEDEV in mtd tree
* compiled the mtd utils
My problems are:
* There doesn't seem to be a map for Walnut boards,
  anyone has got one?
* Ebony can read from the flash well, but cannot
write.
  Flash_info says: "0 erase regions". Flash_unlock and
  all write attemps fail, when trying to open the
  device in O_RDWR or O_WRONLY mode. What might be
  the problem?
Tested the physical ram test device on Walnut (mapped
to the boards SRAM at 0xFFF00000) and that worked
fine.

Thanks for any help.


  


	
	
		
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Re: Getting mtd to work with IBM Evaluation boards (Ebony/Walnut)

[bandwidthcrunch]

http://kelp.or.kr/korweblog/stories.php?story=04/06/30/7742286 is
doing something with one of these boards .


On Mon, 8 Nov 2004 21:19:32 +0000 (GMT), Chan Siu Ming
<namely_void@yahoo.co.uk> wrote:
> Hello,
> I'm trying to get mtd to work with IBM Walnut and
> Ebony PPC evaluation boards. I tried with mtd CVS
> from 2004.11.03 and Linux 2.6.9, but seem to have
> some problems. Here's first what I did do with
> success:
> * patched kernel with CVS mtd and compiled it,
>   everything into the kernel - no modules. I'm
>   not quite sure what I should have enabled in
>   the config, but I guess these boards have CFI
>   AMD chips in them.
> * populated /dev with the MAKEDEV in mtd tree
> * compiled the mtd utils
> My problems are:
> * There doesn't seem to be a map for Walnut boards,
>   anyone has got one?
> * Ebony can read from the flash well, but cannot
> write.
>   Flash_info says: "0 erase regions". Flash_unlock and
>   all write attemps fail, when trying to open the
>   device in O_RDWR or O_WRONLY mode. What might be
>   the problem?
> Tested the physical ram test device on Walnut (mapped
> to the boards SRAM at 0xFFF00000) and that worked
> fine.
> 
> Thanks for any help.
> 
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>

Re: Getting mtd to work with IBM Evaluation boards (Ebony/Walnut)

[Chan Siu Ming]

 --- bandwidthcrunch <bandwidthcrunch@gmail.com>
wrote: 
>
http://kelp.or.kr/korweblog/stories.php?story=04/06/30/7742286
> is
> doing something with one of these boards .
 
I've noticed that, too, but my Korean must be a bit
rusty since most of the text seems incomprehensible.
 
> On Mon, 8 Nov 2004 21:19:32 +0000 (GMT), Chan Siu
> Ming
> <namely_void@yahoo.co.uk> wrote:
> > My problems are:
> > * There doesn't seem to be a map for Walnut
> boards,
> >   anyone has got one?
> > * Ebony can read from the flash well, but cannot
> > write.
> >   Flash_info says: "0 erase regions". Flash_unlock
> and
> >   all write attemps fail, when trying to open the
> >   device in O_RDWR or O_WRONLY mode. What might be
> >   the problem?

I looked at code in maps/ebony.c and it seems to use
map_rom for one the chips. That must be why it cannot
be written to. The chips are AM29F040 which are JEDEC
chips. If I change the map_rom to "jedec_probe", I
think it should work. But I would like to know why
it has been set to map_rom originally. Is there some
problem that makes the actual flash chip driver not
to work with Ebony board, or what?

--






	
	
		
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