[PATCH v3] Fix mtd-utils bugs

stanley.miao stanley.miao at windriver.com
Wed Aug 4 03:33:53 EDT 2010

Sorry for taking so long time. I am busy with our project recently.
I have seen you merged Kavin's patches. I will read them and add my 
patches based
on them as soon as possible.


Artem Bityutskiy wrote:
> On Sun, 2010-07-18 at 11:40 +0300, Artem Bityutskiy wrote:
>> On Sun, 2010-06-20 at 20:22 +0800, Stanley.Miao wrote:
>>> Changes from V2:
>>> 1, Get the linux version via uname() according to Joakim Tjernlund.
>>> 2, Set the default version the latest version according to Joakim Tjernlund.
>>> The "struct nand_oobinfo" is able to record only 32 ECC code positions,which
>>> is not enough for many big NAND chips. Therefore, this structure is replaced
>>> by "struct nand_ecclayout" in linux kernel from the version 2.6.17.
>>> Consequently, the ioctl command changed from MEMGETOOBSEL to ECCGETLAYOUT.
>>> Now update nandwrite to use the new ioctl command ECCGETLAYOUT. In order to
>>> keep compatible with the old linux kernel, a linux version detection function
>>> is added.
>>> YAFFS and JFFS2 has updated and we don't need the arguments "forcelegacy",
>>> "forcejffs2", "forceyaffs" anymore. Now clean them up. 
>> Stanley, sorry that this all takes so long time, I do not have enough
>> time. Basically, Kevin's patches are almost there, I sent him 2 other
>> patches, as soon as he reviews them, they should go in. Then you can
>> start using libmtd for your purposes as well. You'll need to extend it a
>> bit, though.
>> Vs. uname() - I do not really like this idea, because kernel version
>> does not cover the case when ECCGETLAYOUT is back-ported to older
>> kernels.
>> Try to use similar technique as Kevin used - just call ECCGETLAYOUT
>> ioctl, and if it returns ENOTTY, this ioctl is not supported. See also
>> offs64_ioctl flag handling in my patches to Kevin (sent 1 yesterday, and
>> 1 today).
> Just a reminder than now we have Kevin's patches in and you can do your
> things on top.

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