[Yaffs] [Yaffs-archive] Re: MTD settings for yaffs ?

[Thomas Gleixner]

On Thursday 31 July 2003 20:55, J.D. Bakker wrote:
> Hi all,
>
> I've just finished an MTD driver for a 1Gb Toshiba NAND Flash on a
> LART expansion board. I want to use yaffs on the entire NAND, and was
> wondering about the proper setting of some MTD options
>
> 1) Should my driver set this->eccmode to NAND_ECC_NONE or
> NAND_ECC_SOFT ? I know yaffs does its own ECC, but MTD is quite ..
> verbose in discouraging NAND_ECC_NONE.

Set it to ECC_SOFT, as this switch tells the generic nand driver, which method 
of ECC to use. YAFFS supports the built in ECC generator in nand.c. There is 
some config switch in YAFFS, which enables this. YAFFS then just tells the 
nand driver, where in OOB to put / get ECC bytes.
This is the preferred way.

> 2) In a similar vein, should CONFIG_MTD_NAND_VERIFY_WRITE be set ?

I think YAFFS can do it's own verify, but there should be a option to use the 
nand built in, as it will be faster to do so. Charles ???

-- 
Thomas
________________________________________________________________________
linutronix - competence in embedded & realtime linux
http://www.linutronix.de
mail: tglx@linutronix.de


---------------------------------------------------------------------------------------
This mailing list is hosted by Toby Churchill open software (www.toby-churchill.org).
If mailing list membership is no longer wanted you can remove yourself from the list by 
sending an email to yaffs-request@toby-churchill.org with the text "unsubscribe" 
(without the quotes) as the subject.