How does one mount an existing jffs2 partition so it is writeable?

[Conn Clark]

Conn Clark wrote:
> 
> Christopher Hoover wrote:
> >
> > Do you need to unlock your flash before you can write to it?  That's not
> > done automatically by mtd or jffs2.  There's a diff in the ARM patch
> > system by me that might be applicable.
> >
> > -ch
> >
> > ______________________________________________________
> > Linux MTD discussion mailing list
> > http://lists.infradead.org/mailman/listinfo/linux-mtd/
> 
> This is what I needed to know and is probably the culprit. However my unlock
> utility is broken. I can tell this because it doesn't even try to move through
> the sectors in the partition like the lock command does.
> 
> I think I have it under control now.
> 
> Thanks.
> 
>         Conn
 I meant to say move through the sectors like the erase command, however I
can see that the lock command works very similar to the unlock command. This
makes me suspect that I have something wrong in the kernel code.

here is what I have.

I am running on a MPC850 PowerPC processor.
I am using a single intel TE28F320C3BA110 flash chip mapped as a 16 bit device. 
I am using kernel 2.4.19 from kernel.org with the shared zlib patch.

I had to change 2 lines in cfi_cmdset_0001.c from

        extp->FeatureSupport = cfi32_to_cpu(extp->FeatureSupport);
        extp->BlkStatusRegMask = cfi32_to_cpu(extp->BlkStatusRegMask);

to

        extp->FeatureSupport = le32_to_cpu(extp->FeatureSupport);
        extp->BlkStatusRegMask = le16_to_cpu(extp->BlkStatusRegMask);

in order to fix an endian issue.

I had to create a custom map driver as well.

Any ideas on what else I have to change to get the lock/unlock commands to work?

Thanks in advance,
        Conn
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Conn Clark
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