RE: [microblaze-uclinux] CFI Flash on 8bit bus?

["Errol Terblanche" <rince@xxxxxxxxxxx>]

Do you get the status info?

Like Anuroop said, use XMD to mwr the status command to the flash(any flash
address), then do a mrd from any flash address, if you still get 0xff from
the chip then try swapping the bits, ie, if the status command is 0x70 then
try 0x0E to see if the bits are swapped. Once you get a valid status (for
mine it is 0x80) then you can try the Manufacturer command again, but look
for it at the bit swapped address too...

I had to struggle with this for a while... :-)

Hope this helps...

But I still can't write to the flash, even with the EMC hack. Don't know
what I'm doing wrong, will investigate further, or just design my board with
16bit bus...


Thanx,
E


-----Original Message-----
From: owner-microblaze-uclinux@itee.uq.edu.au
[mailto:owner-microblaze-uclinux@itee.uq.edu.au] On Behalf Of Tom Curran
Sent: Tuesday, July 12, 2005 5:27 PM
To: microblaze-uclinux@itee.uq.edu.au
Subject: [microblaze-uclinux] CFI Flash on 8bit bus?

Hello,

The following email thread was sent to me by a friend.  I am having what may
be similar issues with an 8-bit flash device attached to the opb_emc of my
MicroBlaze platform.  I cannot seem to get the flash device to respond to
queries for its Manufacturer_ID or Device_ID.  I am curious about the
modifications to the opb_emc that are mentioned below?  What sort of
modifications?  Where can I get them?  Although I am not running an OS on my
platform, I think they might be relevant.  Any help is appreciated!  Many
thanks in advance.

--Tom Curran
Xilinx FPGA and Microblaze design lackey
narrucmot@verizon.net

>
> -----Original Message-----
> From: owner-microblaze-uclinux@itee.uq.edu.au
> [mailto:owner-microblaze-uclinux@itee.uq.edu.au] On Behalf Of Errol
> Terblanche
> Sent: Thursday, July 07, 2005 2:57 AM
> To: microblaze-uclinux@itee.uq.edu.au
> Subject: RE: [microblaze-uclinux] CFI Flash on 8bit bus?
>
> Hi David,
>
> Ahh, so that is why it specifically mentions "16-bit flash works with
> JFFS2
> filesystem". :-).
>
> Thanks for the info.
>
> Thanx,
> E
>
>
> -----Original Message-----
> From: owner-microblaze-uclinux@itee.uq.edu.au
> [mailto:owner-microblaze-uclinux@itee.uq.edu.au] On Behalf Of David
> Banas
> Sent: Tuesday, July 05, 2005 10:44 PM
> To: microblaze-uclinux@itee.uq.edu.au
> Subject: RE: [microblaze-uclinux] CFI Flash on 8bit bus?
>
> Hi Erol,
>
> Those of us using 16-bit wide FLASH have had to use some modifications
> to
> the actual HDL code for the EMC core. These mods were originally written
> by
> Steve Sanders. I wonder if you're in the same boat and might need to
> follow
> Steve's example, in order to make the EMC core compatible with your
> FLASH.
>
> David Banas
> Field Applications Engineer
> Nu Horizons Electronics Corp.
> 2070 Ringwood Avenue
> San Jose, CA 95131
> (408)434-0800 - office
> (415)846-5837 - cell
> http://www.nuhorizons.com
>
>> -----Original Message-----
>> From: owner-microblaze-uclinux@itee.uq.edu.au
> [mailto:owner-microblaze-
>> uclinux@itee.uq.edu.au] On Behalf Of Errol Terblanche
>> Sent: Friday, July 01, 2005 12:42 AM
>> To: microblaze-uclinux@itee.uq.edu.au
>> Subject: [microblaze-uclinux] CFI Flash on 8bit bus?
>>
>> Hi everyone,
>>
>> I have been struggling with flash for the last few days, and I'm at my
>> wit's
>> end.
>>
>> I have configured mtd to use Intel flash and to use 8bit bus width.
>>
>> During boot I get the following message:
>>
>> [snip]
>> physmap flash device: 1000000 at 24000000
>> cfi_cmdset_0001: Erase suspend on write enabled
>> 0: offset=0x0,size=0x20000,blocks=128
>> Using buffer write method
>> physmap: no partition info available, registering whole flash at once
>> [snip]
>>
>> That tells me that it did detect the chip, as its block size is
>> 0x20000(128KB) and it has 128 blocks for a total of 16MB.
>>
>> But when I try and format(or dd) it I get the following:
>>
>> [snip]
>> # ftl_format /dev/mtd0
>> Partition size = 16 mb, erase unit size = 128 kb, 1 transfer units
>> Reserved
>> 5%, formatted size = 15631872 bytes Erasing all blocks...
>> Chip reports improper command sequence: status 0x7000000000
>>
>> block erase failed: Input/output error
>> format failed.
>> [snip]
>>
>> The only thing that I can think of is that mtd is accessing it as
>> something
>> other than 8 bit mode thus sending erroneous blank commands during the
>> erase
>> command sequence. And why is 0x7000000000 a 40 bit number?
>>
>> Thanx,
>> Errol
>>
>>
>> ___________________________
>> microblaze-uclinux mailing list
>> microblaze-uclinux@itee.uq.edu.au
>> Project Home Page :
> http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
>> Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-
>> uclinux/
>>

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