How to use EP8260 MTD device?

Gary Thomas gary at mlbassoc.com
Fri Feb 14 09:12:49 EST 2003 

On Fri, 2003-02-14 at 06:59, OHMURA Yutaka wrote:
> 
> A bit info (and memo for me ^^)
> 
> EP8260 using four 16 bits flash ROM (64bit width), and I tried to send CFI
> query command. But Linux MTD driver looks not think like this design.
> I hope It can use as same as two 16 bits flash ROM (32bit width) or one
> 16 bits flash ROM (16bit width).
> 
> My first try, do "*(volatile unsigned int *)(0xFF000000 + 0x55 * 8) = 0x0098;",
> after that I got data "Q" with "data = *(volatile unsigned int *)(0xFF000000 +
> 0x10 * 8);" same as "R" and "Y".
> But I could't got "Q" when I did "writel(0x0098, 0xFF000000 + 0x55 * 8);",
> I wondered, finally I got "Q" when I did "writel(0x9800, 0xFF000000 + 0x55
> * 8);", so the "writel" wrapper must be adjust EP8260 (or for big endian
> MPUs)....
> 

Which source tree are you using?  At least the 2_4_devel (where I 
looked) does not yet have 64-bit support in place.  

64-bit CFI support is available in the MTD drivers.  You might try
using the latest ones.  I'm copying the MTD support list so they
may be able to help you with this.

> OHMURA Yutaka <ohmura at co-nss.co.jp> wrote:
> 
> >
> > Hi,
> >
> > I got some info about EP8260, the 200MHz uses AM29LV320, and it's not supported
> > by Linux, so I'll tring to use it now.
> > And I'm tring to add set BCSR2 register GFWP bit which controll Flash write/not.
> >
> > Steven Blakeslee <BlakesleeS at embeddedplanet.com> wrote:
> >
> > >
> > > It looks like you are using the MTD with the onboard FLASH.  I noticed you
> > > have "CONFIG_MTD_PHYSMAP_BUSWIDTH=2", the FLASH on the ep8260 is a 64bit
> > > bus, wouldn't that mean this should be a "CONFIG_MTD_PHYSMAP_BUSWIDTH=4".
> > >
> > > Also, there are more configurations you can make, particularly for FLASH.
> > > You should use make menuconfig and look at the other options.
> > >
> > > Lastly, there is mention of MTD for the RPX LITE and CLLF boards.  These
> > > have the same FLASH but a 32 bit bus, you may be able to modify this support
> > > to include 64 bit for the ep8260.
> > >
> > > -----Original Message-----
> > > From: OHMURA Yutaka [mailto:ohmura at co-nss.co.jp]
> > > Sent: Friday, January 31, 2003 8:40 AM
> > > To: linuxppc-embedded at lists.linuxppc.org
> > > Subject: Re: How to use EP8260 MTD device?
> > >
> > >
> > >
> > > Hi,
> > >
> > > In this ML, no one uses EP8260?
> > > Or TSL(2.4.7 base)?
> > >
> > > I changed my .config as follows, but still not work.
> > > > # Memory Technology Devices (MTD)
> > > > CONFIG_MTD=y
> > > > CONFIG_MTD_DEBUG=y
> > > > CONFIG_MTD_DEBUG_VERBOSE=3
> > > > CONFIG_MTD_PARTITIONS=y
> > > > CONFIG_MTD_CHAR=y
> > > > CONFIG_MTD_BLOCK=y
> > > > CONFIG_FTL=y
> > > >
> > > > # RAM/ROM/Flash chip drivers
> > > > CONFIG_MTD_CFI=y
> > > > CONFIG_MTD_GEN_PROBE=y
> > > > CONFIG_MTD_CFI_AMDSTD=y
> > > >
> > > > # Mapping drivers for chip access
> > > > CONFIG_MTD_PHYSMAP=y
> > > > CONFIG_MTD_PHYSMAP_START=FF000000
> > > > CONFIG_MTD_PHYSMAP_LEN=FFFFFF
> > > > CONFIG_MTD_PHYSMAP_BUSWIDTH=2
> > >
> > > By the way, TSL uses DEC register for timer, is this same in pure PPC-Linux?
> > > I could't find pure PPC-Linux 2.4.7 source code...
> > >
> > > Regards,
> > >
> > > Yutaka
> > >
> > > OHMURA Yutaka <ohmura at co-nss.co.jp> wrote:
> > >
> > > >
> > > > Hello,
> > > >
> > > > Now I'm trying to use Embedded Planet 8260 board Flash memory with TimeSys
> > > > Linux 3.1(TSL). I have two type of this board. One has 200MHz clock, have
> > > RTC,
> > > > 64MB PSDRAM, 32MB LSDRAM and 16MB Flash ROM. The other has 300MHz clock,
> > > > no RTC, 32MB PSDRAM and 8MB Flash ROM. My goal is use MTD device under TSL
> > > with
> > > > 300MHz MPU board, but the board looks some other difference with 200MHz
> > > board,
> > > > so TSL can't works fine, so at first I'm trying to use MTD device with
> > > 200MHz
> > > > board. But I can't use MTD until now.
> > > > In now situation, /dev/mtd and /dev/mtdblock are normal directory and
> > > there are
> > > > nothing under the directory.
> > > >
> > > > Please tell me how to use MTD on EP8260 under TSL!
> > > >
> > > > Here is my .config
> > > > > # Memory Technology Devices (MTD)
> > > > > CONFIG_MTD=y
> > > > > CONFIG_MTD_DEBUG=y
> > > > > CONFIG_MTD_DEBUG_VERBOSE=3
> > > > > CONFIG_MTD_PARTITIONS=y
> > > > > CONFIG_MTD_CHAR=y
> > > > > CONFIG_MTD_BLOCK=y
> > > > > CONFIG_FTL=y
> > > >
> > > > > # RAM/ROM/Flash chip drivers
> > > > > CONFIG_MTD_CFI=y
> > > > > CONFIG_MTD_JEDECPROBE=y
> > > > > CONFIG_MTD_GEN_PROBE=y
> > > > > CONFIG_MTD_CFI_AMDSTD=y	<-On board Flash memory looks AMD
> > > > 				  chip but the print faint so I
> > > > 				  can't read chip type
> > > > > CONFIG_MTD_CFI_AMDSTD=y
> > > > > CONFIG_MTD_OBSOLETE_CHIPS=y
> > > > > CONFIG_MTD_AMDSTD=y
> > > >
> > > > > # Mapping drivers for chip access
> > > > > CONFIG_MTD_PHYSMAP=y
> > > > > CONFIG_MTD_PHYSMAP_START=FF800000	<-adjusting to 300MHz board
> > > > > CONFIG_MTD_PHYSMAP_LEN=70000000	  I hope 200MHz board can work with
> > > > 					  this parameter
> > > > > CONFIG_MTD_PHYSMAP_BUSWIDTH=2
> > > > other MTD parameters are not set
> > > >
> > > > Under this environment, MTD driver says
> > > > > physmap flash device: 6ffffc at ff800000
> > > > > CFI: Found no Physically mapped flash device at location zero
> > > > > RPX Lite or CLLF flash device: 2000000 at fe000000
> > > > > CFI: Found no RPX device at location zero
> > > > > $Id: ftl.c,v 1.38 2001/09/23 21:15:12 dwmw2 Exp $
> > > >
> > > > This is first time to use MTD for me, so if you know good reference to use
> > > it,
> > > > please tell me too.
> > > > /usr/src/timesys/ep8260/2.4.7-timesys-3.1.180/kernel/Documents was not
> > > help me.
> > > >
> > > > Regards,
> > > >
> > > > Yutaka
> > > >
> > > >
> > >
> > >
> > > _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> > > OHMURA, Yutaka <ohmura at co-nss.co.jp>
> > >   Nissin Systems co.,ltd.
> > >   (Phone) +81-75-344-7950  (FAX) +81-75-344-7888
> > >    Ayakoji, Horikawa street, Shimogyo-ku, KYOTO, JAPAN
> > > _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> > >
> > >
> > >
> >
> >
> > _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> > OHMURA, Yutaka <ohmura at co-nss.co.jp>
> >   Nissin Systems co.,ltd.
> >   (Phone) +81-75-344-7950  (FAX) +81-75-344-7888
> >    Ayakoji, Horikawa street, Shimogyo-ku, KYOTO, JAPAN
> > _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> >
> >
> >
> 
> 
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> OHMURA, Yutaka <ohmura at co-nss.co.jp>
>   Nissin Systems co.,ltd.
>   (Phone) +81-75-344-7950  (FAX) +81-75-344-7888
>    Ayakoji, Horikawa street, Shimogyo-ku, KYOTO, JAPAN
> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> 
> 
> ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

-- 
------------------------------------------------------------
Gary Thomas                 |
MLB Associates              |  Consulting for the
+1 (970) 229-1963           |    Embedded world
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email: <gary at mlbassoc.com>  |
gpg: http://www.chez-thomas.org/gary/gpg_key.asc
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