RE: CFI flash support for AMD chips

-----Original Message-----
From: Amit D Chaudhary [mailto:amitc@brocade.com]
Sent: Monday, August 13, 2001 10:25 PM
To: Navin Boppuri
Cc: Linuxppc-Embedded (E-mail)
Subject: Re: CFI flash support for AMD chips


ls -l /dev/mtd*
crw-r--r--   1 root     root      90,   0 Jun 11  2001 /dev/mtd0
crw-r--r--   1 root     root      90,   2 Jun 11  2001 /dev/mtd1
crw-r--r--   1 root     root      90,  20 Jun 11  2001 /dev/mtd10

The char devices are required for the utilities (erase, eraseall, etc.) that
you find in the /util directory.

You also need to have block devices if you want to mount your flash as a
filesystem.

My dev entries:

crw-r--r--   1 0        0         90,   0 Jan  1  1970 mtd0
crw-r--r--   1 0        0         90,   2 Jan  1  1970 mtd1
crw-r--r--   1 0        0         90,   4 Jan  1  1970 mtd2
crw-r--r--   1 0        0         90,   6 Jan  1  1970 mtd3
crw-r--r--   1 0        0         90,   8 Jan  1  1970 mtd4
crw-r--r--   1 0        0         90,  10 Jan  1  1970 mtd5
brw-r--r--   1 0        0         31,   0 Jan  1  1970 mtdblock0
brw-r--r--   1 0        0         31,   1 Jan  1  1970 mtdblock1
brw-r--r--   1 0        0         31,   2 Jan  1  1970 mtdblock2
brw-r--r--   1 0        0         31,   3 Jan  1  1970 mtdblock3
brw-r--r--   1 0        0         31,   4 Jan  1  1970 mtdblock4
brw-r--r--   1 0        0         31,   5 Jan  1  1970 mtdblock5

I believe you will also need to enable:
CONFIG_MTD_CHAR=y
CONFIG_MTD_BLOCK=y

And then just mount the filesystem:

mount -t jffs /dev/mtdblock2 /flash

This should create a jffs filesystem on your flash partition.  You may need
to use the erase utility in the /util directory if the flash is not erased.
There is a HOWTO on the mtd website that explains this in more detail.

Kevin





Matthew Locke wrote:

Navin Boppuri wrote:

quoted

Hello,

I am trying to use the CFI flash support for AMD chips. I selected the
CFI support in kernel configuration and defined the flash memory map on
my board ( CFI Flash device in Physical memory map). I see that CFI is
able to find the flash devices on my board correctly. Now, do I need to
create a /dev/flash device in the dev directory? What Major, Minor
numbers do I use? How do I actually use this driver???

check out the MTD home page. http://www.linux-mtd.infradead.org

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