Re: [Yaffs] [YAFFS2] : Mounting YAFFS2 from boot-loader

On Monday 21 June 2010 13:30:34 Saquib wrote:
> Hi All,
>
> Thanks a lot.
>
> With the below code I am able to read only 112KB of data. "while" loop
> executes only for 28 times. I tried to debug the yaffs_read function, for
> successful iteration obj->variantType is YAFFS_OBJECT_TYPE_FILE, but it is
> coming out from while loop when obj->variantType resets to 0x3C038832.

This makes no sense to me. An object's file type should not change during a
read (well it should not change at all unless you delete the object).

Two suggestions:
1) Check that the read is not corrupting the stack or heap. If you read into
the same area that the stack or heap is located you will get problems like
this.

2) Try recompiling everything. Stale object files could be using the wrong
object layouts.


>
> I am not able to find the root cause. Please help to fix this issue.
>
> Thanks in advance.
>
> Regards,
> Saquib
>
> On Thu, Jun 17, 2010 at 7:59 AM, Charles Manning
<manningc2@actrix.gen.nz>wrote:
> > On Thursday 17 June 2010 14:17:14 Saquib wrote:
> > > Hi All,
> > >
> > > Thanks for your support and coperation.
> > >
> > > I am able to read files using YAFFS Direct interface.
> > >
> > > Now I want to copy a binary file e.g. XYZ into RAM's specified address.
> > >
> > > How can I get the start address of file XYZ on NAND flash with
> > > file-size (EOF)?
> >
> > YAFFS is a file system so you need to do this using file system calls.
> > You cannot do a binary copy fromflash.
> >
> > You need to do something like this:
> >
> > unsigned char *buffer;
> >
> > int load_handle = yaffs_open("filename",O_RDONLY,0);
> > buffer = (unsigned char *) load_address;
> >

> > while ((nread = yaffs_read(load_handle,buffer,4096)) > 0)
> >        buffer += nread;

> >
> > yaffs_close(load_handle);
> >
> > > Thanks in advance.
> > >
> > > Regards,
> > > Saquib
> > >
> > > On Mon, Jun 14, 2010 at 2:59 AM, Charles Manning
> >
> > <manningc2@actrix.gen.nz>wrote:
> > > > On Friday 11 June 2010 00:27:31 Saquib wrote:
> > > > > Hi All,
> > > > >
> > > > > Thanks for your continued support and cooperation.
> > > > >
> > > > > I am using 1GB NAND Flash. From Linux, I created four partitions of
> > > > > 256MB each and mounted YAFFS2 on four directories /mnt1, /mnt2,
> > > > > /mnt3 and /mnt4 respectively.
> > > > > *
> > > > > /mnt4 folder may contain some executable images.* *From boot-loader
> > > > > I
> > > >
> > > > have
> > > >
> > > > > to run this executable image.*
> > > > >
> > > > > My queries are :
> > > > >
> > > > > (1) Using YAFFS2 Direct Interface can it be achieved?
> > > >
> > > > Yes you can write files in YDI and read it in Linux, or vice versa.
> > > >
> > > > > (2) Can I create partition from YDI?
> > > >
> > > > Yes.
> > > >
> > > > > (3) Partition sizes should be same as Linux?
> > > >
> > > > Yes.
> > > >
> > > > > (4) If yes, how can I access same file which was saved from Linux?
> > > >
> > > > Have you read the information on YAFfS Direct?
> > > >
> > > > http://yaffs.net/yaffs-direct-user-guide
> > > >
> > > > -- Charles
> > > >
> > > >
> > > > _______________________________________________
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> >
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