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Today's Topics:

   1. Support of stupid devices (Ian Molton)
   2. Re: Support of stupid devices (Thomas Gleixner)
   3. Re: [RFC] refactoring MTD cmdset ops, jedec_probe, and
      cfi_probe (Josh Boyer)
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Message: 1
Date: Mon, 16 Aug 2004 01:39:33 +0100
From: Ian Molton <spyro at f2s.com>
Subject: Support of stupid devices
To: linux-mtd at lists.infradead.org
Message-ID: <20040816013933.163a101d.spyro at f2s.com>
Content-Type: text/plain; charset=US-ASCII

Hi.

Im porting linux to the toshiba e7xx and 8xx PDAs which contain a nand flash controller.

Im not certain, but it appears the controllerhas an odd quirk meaning byte-reads of the data register dont work as the linux mtd code expects.

AFAICT if I read a word (after issuing a chipid command) I get:

0xYYZZ75ec   -- this is good - Samsung, 32MB device.

if I do two byte reads I get 0xec 0xec.

a halfword access gets me 0xYYZZ.

a misaligned (by one byte) word access gives me 0xecYYZZ75, but this fails to work for byte accesses. halfword misaligned accesses are just weird.

so basically, the only way to read the chipid is to do:

a word access to the data reg and then shift the data out

or

a word access (and mask off the high 3 bytes followed by a misaligned word access and mask off the upper 3 bytes.

clearly the former solution is the better one, but this doesnt fit in the nand driver model very well (read_byte() et.al.)

the chip is a TC6393XB (system on chip) and the flash is a samsung K9F5608UOC YCBO



------------------------------

Message: 2
Date: Mon, 16 Aug 2004 15:11:17 +0200
From: Thomas Gleixner <tglx at linutronix.de>
Subject: Re: Support of stupid devices
To: Ian Molton <spyro at f2s.com>
Cc: linux-mtd at lists.infradead.org
Message-ID: <1092661877.4354.10.camel at lap02.tec.linutronix.de>
Content-Type: text/plain

On Mon, 2004-08-16 at 02:39, Ian Molton wrote:
> Hi.
> 
> Im porting linux to the toshiba e7xx and 8xx PDAs
> which contain a nand flash controller.
> Im not certain, but it appears the controllerhas an
> odd quirk meaning byte-reads of the data register
> dont work as the linux mtd code expects.
> 
> AFAICT if I read a word (after issuing a chipid command) I get:
> 
> 0xYYZZ75ec   -- this is good - Samsung, 32MB device.
> 
> if I do two byte reads I get 0xec 0xec.
> 
> a halfword access gets me 0xYYZZ.
> a misaligned (by one byte) word access gives me 0xecYYZZ75, 

Sounds really stupid :)

> but this fails to work for byte accesses. halfword misaligned
> accesses are just weird.
> so basically, the only way to read the chipid is to do:
> a word access to the data reg and then shift the data out
> or
> a word access (and mask off the high 3 bytes followed by a
> misaligned word access and mask off the upper 3 bytes.
> clearly the former solution is the better one, but this 
> doesnt fit in the nand driver model very well 
> (read_byte() et.al.)

You can provide your own read_byte() et. al. functions which do all the
magic. Look into the other Toshiba nand driver implementations. They do
the same. I don't have the header files which implement the real access
but Alice should be a source of help.

> the chip is a TC6393XB (system on chip) and the flash 
> is a samsung K9F5608UOC YCBO

tglx


> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/




------------------------------

Message: 3
Date: Mon, 16 Aug 2004 09:13:19 -0500
From: Josh Boyer <jdub at us.ibm.com>
Subject: Re: [RFC] refactoring MTD cmdset ops, jedec_probe, and
	cfi_probe
To: "Eric W. Biederman" <ebiederman at lnxi.com>
Cc: David Woodhouse <dwmw2 at infradead.org>,
	linux-mtd at lists.infradead.org
Message-ID: <1092665599.2912.120.camel at weaponx.rchland.ibm.com>
Content-Type: text/plain

On Thu, 2004-08-12 at 02:13, Eric W. Biederman wrote:
> So far I have been busy with other things so I have been taking the slow route
> to refactoring.  I have just reported the cfi_fixup function from cfi_util
> and have gotten nearly all of the variation in cfi_cmdset_0001 and cfi_cmdset_0002
> under control.  
> 
> It is probably enough infrastructure so that cfi_cmdset_0001 and 0020 could be
> merged.

Sorry for the delay.  Maybe I can convince Joern to get them merged. 
Most of the stuff can probably be done in a fixup function now that they
take a struct mtd_info *.

> 
> For the deeper pieces of command set common code moving their helper functions
> into cfi_util is probably a good place to start.
> 
> I'm hoping I have accomplished enough I don't need to touch the code again for quite a while but...

We can always hope :).

josh




------------------------------

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On Thu, 2004-08-12 at 02:13, Eric W. Biederman wrote:
> So far I have been busy with other things so I have been taking the slow route
> to refactoring.  I have just reported the cfi_fixup function from cfi_util
> and have gotten nearly all of the variation in cfi_cmdset_0001 and cfi_cmdset_0002
> under control.  
> 
> It is probably enough infrastructure so that cfi_cmdset_0001 and 0020 could be
> merged.

Sorry for the delay.  Maybe I can convince Joern to get them merged. 
Most of the stuff can probably be done in a fixup function now that they
take a struct mtd_info *.

> 
> For the deeper pieces of command set common code moving their helper functions
> into cfi_util is probably a good place to start.
> 
> I'm hoping I have accomplished enough I don't need to touch the code again for quite a while but...

We can always hope :).

josh


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/



------------------------------

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On Thu, 2004-08-12 at 02:13, Eric W. Biederman wrote:
> So far I have been busy with other things so I have been taking the slow route
> to refactoring.  I have just reported the cfi_fixup function from cfi_util
> and have gotten nearly all of the variation in cfi_cmdset_0001 and cfi_cmdset_0002
> under control.  
> 
> It is probably enough infrastructure so that cfi_cmdset_0001 and 0020 could be
> merged.

Sorry for the delay.  Maybe I can convince Joern to get them merged. 
Most of the stuff can probably be done in a fixup function now that they
take a struct mtd_info *.

> 
> For the deeper pieces of command set common code moving their helper functions
> into cfi_util is probably a good place to start.
> 
> I'm hoping I have accomplished enough I don't need to touch the code again for quite a while but...

We can always hope :).

josh


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/



------------------------------

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On Thu, 2004-08-12 at 02:13, Eric W. Biederman wrote:
> So far I have been busy with other things so I have been taking the slow route
> to refactoring.  I have just reported the cfi_fixup function from cfi_util
> and have gotten nearly all of the variation in cfi_cmdset_0001 and cfi_cmdset_0002
> under control.  
> 
> It is probably enough infrastructure so that cfi_cmdset_0001 and 0020 could be
> merged.

Sorry for the delay.  Maybe I can convince Joern to get them merged. 
Most of the stuff can probably be done in a fixup function now that they
take a struct mtd_info *.

> 
> For the deeper pieces of command set common code moving their helper functions
> into cfi_util is probably a good place to start.
> 
> I'm hoping I have accomplished enough I don't need to touch the code again for quite a while but...

We can always hope :).

josh


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/



------------------------------

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Cc: David Woodhouse <dwmw2 at infradead.org>, linux-mtd at lists.infradead.org
Subject: Re: [RFC] refactoring MTD cmdset ops, jedec_probe, and cfi_probe
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On Thu, 2004-08-12 at 02:13, Eric W. Biederman wrote:
> So far I have been busy with other things so I have been taking the slow route
> to refactoring.  I have just reported the cfi_fixup function from cfi_util
> and have gotten nearly all of the variation in cfi_cmdset_0001 and cfi_cmdset_0002
> under control.  
> 
> It is probably enough infrastructure so that cfi_cmdset_0001 and 0020 could be
> merged.

Sorry for the delay.  Maybe I can convince Joern to get them merged. 
Most of the stuff can probably be done in a fixup function now that they
take a struct mtd_info *.

> 
> For the deeper pieces of command set common code moving their helper functions
> into cfi_util is probably a good place to start.
> 
> I'm hoping I have accomplished enough I don't need to touch the code again for quite a while but...

We can always hope :).

josh


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