Re: [Yaffs] Writing a YAFFS image to a simulated MTD

Thanks for the reply.

Is there a way to build with inband tags and have it work when I mount it?

I see no option in mkyaffs2image.bin nor mkyaffs2 for inband tags. Am
I missing it somewhere?

When I try nandwrite --oob, this happens:
# nandwrite --oob /dev/mtd0 /tmp/flash.img
Writing data to block 0 at offset 0x0
Segmentation fault

Kenneth

"If you don't want a man unhappy politically, don't give him two sides
to a question to worry him; give him one. Better yet, give him none."
? Ray Bradbury (1920-2012)


On 07/19/2012 06:34 PM, Charles Manning wrote:
> On Friday 20 July 2012 12:28:39 Kenneth Ingham wrote:
>> I am using the kernel modules mtd, mtdblock, and nandsim to
>> create a simulated YAFFS setup for experimenting.
>>
>> I can mount an empty YAFFS2 filesystem, mount it, copy files to
>> it, etc.
>>
>> What I cannot do is to create a YAFFS2 image and write it to the
>> simulator. flash.img is my YAFFS2 image; I have tried both
>> mkyaffs2 from yaffs2utils and mkyaffs2image.bin from Google code.
>> I can unyaffs2 the image and extract the files.
>>
>> Here is what I have tried: dd if=/tmp/flash.img
>> of=/dev/mtdblock0 nandwrite --pad /dev/mtd0 flash.img flashcp
>> flash.img /dev/mtd0
>>
>> After any of these, all I have is an empty filesystem. What am I
>> missing?
>>
>> Environment: OpenSUSE 12.1, kernel 3.1.10-1.16, relevant
>> packages:
>> yaffs2multi-kmp-desktop-0.0.848_k3.1.10_1.16-3.5.x86_64
>> yaffs2utils-0.2.8.0.svn33-3.1.x86_64 mtd-utils-1.2.0-3.1.x86_64
>
>
> What you are doing would work if you were using yaffs2 with inband
> tags.
>
> If you are not using yaffs inband tags then the tags are being
> stored in the nand oob area and you need to use nandwrite including
> oob.
>
> The current stuff is not very satisfactory and I am (slowly and in
> background) building up a new set of yaffs nand tools to help get
> around these issues.
>
> -- Charles
>
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