Re: AMD Flash Interface for updating boot flash

Where do you set this up? If I want to use partitions, where do I put the info on how it is partitioned?

I modified the kernel .config and it gives me the following startup messages:

physmap flash device: 80000 at fff00000
CFI: Found no Physically mapped flash device at location zero

I'll check out the MTD list.

Chuck

quoted

quoted

[off-list ref] 06/26/02 02:49PM >>>

I agree that MTD is the way to go, but with one small change to Michael's
instructions.

configure MTD for  char driver support, and do
dd if=bootloader of=/dev/mtd0

/dev/mtd0 is a raw char device that is best to write a binary boot image
to flash,
/dev/mtdblock0 is a block device that is best for file system images,
which can then be mounted.

You can get expert advice from the MTD list:

http://lists.infradead.org/mailman/listinfo/linux-mtd/

Jan




"Michael Meriin" [off-list ref]
Sent by: owner-linuxppc-embedded@lists.linuxppc.org
06/26/2002 12:17 PM


        To:     "Chuck Partridge" [off-list ref],
[off-list ref]
        cc:
        Subject:        Re: AMD Flash Interface for updating boot flash



Just define your flash as a MTD device and then, from user space use dd
command to copy your bootloader to flash:

dd if=bootloader of=/dev/mtdblock0

Best Regards,
                     Michael Meriin


----- Original Message -----
From: "Chuck Partridge" <redacted>
To: <redacted>
Sent: Wednesday, June 26, 2002 17:09
Subject: AMD Flash Interface for updating boot flash

Hello all,

I have been searching the archives and I am a bit confused, so bear with

me if this is too simple a question.

I need to provide a way to update my boot flash from user space.
Our user application will download an boot flash image and save it (to a

file or a buffer), we must then write the flash.

I have seen references in the archives to Denx's

drivers/char/amd_flash.c
and to MTD drivers, or I can

implement my own driver, but I'm not sure of the best (i.e. easiest and

cleanest) way.

I don't need to put a file system on the flash.  All it does is hold the

PPCBoot image.  The flash part is an AMD

29LV004B and is setup for 8 bit interface.  I am running a 2.4.17 kernel

on an 8245.

Any suggestions?

Thanks,

Chuck

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On 06/26/2002 10:23 PM, Chuck Partridge wrote:

Where do you set this up? If I want to use partitions, where do I put the info on how it is partitioned?

I modified the kernel .config and it gives me the following startup messages:

physmap flash device: 80000 at fff00000
CFI: Found no Physically mapped flash device at location zero

I'll check out the MTD list.

Chuck

Have a look to

  http://www.denx.de/doc/TQM8xxL/advanced-topics.html#FLASH-FILESYSTEMS

That's the way it is done for TQM8xxL. Maybe you just need to setup a
mapping
for your board in drivers/mtd/maps.

Hope it helps,

Wolfgang.


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