'RE: [uClinux-dev] mtd partitions in flash NOT ram'

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List:       uclinux-dev
Subject:    RE: [uClinux-dev] mtd partitions in flash NOT ram
From:       "Jordan Fuerst" <jfuerst () freewave ! com>
Date:       2005-12-23 18:10:37
Message-ID: 294F2324D4D16240B5E2826F8EF43B18379710 () MAIL ! freewave ! local
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How do I get one of these maps to compile into the build? I see no
options to include these mapping schemes in the xconfig setup.

There is no .config file for the maps folder either.

Am I right to think that I can boot image.gz out of flash and into ram.
Mount a portion of flash as a settings page and mount the image
addresses as well and without enabling jffs2 or similar still use these
tools to flash and upgrade?

Regards,

Jordan 

-----Original Message-----
From: uclinux-dev-bounces@uclinux.org
[mailto:uclinux-dev-bounces@uclinux.org] On Behalf Of David McCullough
Sent: Wednesday, December 21, 2005 2:36 PM
To: uClinux development list
Subject: Re: [uClinux-dev] mtd partitions in flash NOT ram

Jivin Jordan Fuerst lays it down ...
> Netflash & flashw look like perfect solutions, however now I have a
new
> problem.
> 
> Netflash is a command line utility that I need to hand a mtd partition
> to. I looked through the postings and through google and then modified
> the mtd/maps/uclinux.c file adding in my bootloader, settings page,
and
> two image.gz partitions.
> 
> Cat /proc/mtd shows all these partitions now HOWEVER it looks to me
like
> they are mapped in ram. How do I change these locations over to be in
> flash?

Have a look at the nettel-uc.c maps and/or some of the others for real
flash mappings.  The uclinux.c map is just for RAM mappings.

Cheers,
Davidm

> -----Original Message-----
> From: uclinux-dev-bounces@uclinux.org
> [mailto:uclinux-dev-bounces@uclinux.org] On Behalf Of David McCullough
> Sent: Tuesday, December 20, 2005 3:43 PM
> To: uClinux development list
> Subject: Re: [uClinux-dev] Preferred way to change settings from web
> page.
> 
> 
> Jivin Jordan Fuerst lays it down ...
> > 
> > How or what drivers do I need to modify to be able to erase and
> program
> > flash. I have intel P30 flash in kernel 2.6 on the coldfire 5275. I
> > assume I need to make a map and modify some erase and program
> functions
> > as well as make nodes. Where do I need to make these changes? Are
> there
> > any web pages that anyone is aware of that talk about doing this
> without
> > jffs2? I cannot write to these registers from user space due the
5275
> > architecture so I will have to use a driver.
> 
> The P30 is a fairly special case,  it powers up with all sectors
locked.
> 
> The older J3 style Intel flash power up unlocked by default,  but you
> could
> lock sectors (and they would stay locked, ie., non-volatile).
> 
> You can use the P30 just like the J3 flash,  only you need to unlock
it
> to write to it.
> 
> Tools in the dist like netflash/flashw have command line options to do
> this (-u).  But if you are using JFFS/JFFS2 you need to unlock it in
> your map driver.
> 
> Have a look at the epxa10db-flash.c map driver to see how it might be
> done.
> 
> Other than that you normal cfi_probe should be enough, I am still
> finishing off support on one of our boards for this chip, and the
> unlocking in the MTD map driver is the only change I have had to make
so
> far, and it is booting from flash fine ;-)
> 
> Cheers,
> Davidm
> 
> > > Sorry, do you want to know now if it's better to store in
> > > a flash or in a EEPROM?  Either will do fine.
> > > Do you want to know if you need jffs2 to store configuration
> > > settings? No. I wouldn't bother with it if this is my only
> > > use in the system. You can read and write to a flash device
> > > without jffs2 without problems.
> > 
> > > Best regards,
> > > Lars Friedrich
> > _______________________________________________
> > uClinux-dev mailing list
> > uClinux-dev@uclinux.org
> > http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
> > This message was resent by uclinux-dev@uclinux.org
> 
> -- 
> David McCullough, davidm@cyberguard.com.au, Custom Embedded Solutions
+
> Security
> Ph:+61 734352815 Fx:+61 738913630 http://www.uCdot.org
> http://www.cyberguard.com
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-- 
David McCullough, davidm@cyberguard.com.au, Custom Embedded Solutions +
Security
Ph:+61 734352815 Fx:+61 738913630 http://www.uCdot.org
http://www.cyberguard.com
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