On Friday 10 June 2011 02:39:45 you wrote:
> > From: manningc2@actrix.gen.nz
> > To: yaffs@lists.aleph1.co.uk
> > Subject: Re: [Yaffs] (no subject)
> > Date: Thu, 9 Jun 2011 06:23:38 +1200
> > CC: chessmylitis@hotmail.com
> >
> > On Wednesday 08 June 2011 18:51:36 Rhykie Rhykie wrote:
> > > From: chessmylitis@hotmail.com
> > > To: manningc2@actrix.gen.nz
> > > Subject: RE: [Yaffs] (no subject)
> > > Date: Wed, 8 Jun 2011 06:47:08 +0000
> > >
> > > > From: manningc2@actrix.gen.nz
> > > > To: yaffs@lists.aleph1.co.uk
> > > > Subject: Re: [Yaffs] (no subject)
> > > > Date: Wed, 8 Jun 2011 17:01:01 +1200
> > > > CC: chessmylitis@hotmail.com
> > > >
> > > > On Wednesday 08 June 2011 02:10:42 Rhykie Rhykie wrote:
> > > > > Hi,
> > > > > I have two questions:
> > > > >
> > > > > 1) In the cramfs file system i have a source code in which i want
> > > > > to use fread()/fwrite() functions to read/write to a text file in
> > > > > the yaffs file system, all this in a nand flash memory in two
> > > > > different partitions. Unfortunately when compiling i get the
> > > > > "trying to access read-only file system" error. Any idea of how i
> > > > > can achieve what i want to do.
> > > >
> > > > That is very little info to work on/ Can you explain more?
> > >
> > > Ok, the nand flash is divided into four MTD block partitions; in
> > > mtdblock2 there is a cramfs file system which comprises my source code.
> > > Now since cramfs is read-only, I want to permanently store some text
> > > files in mtdblock3 which is a yaffs file system, allowing read and
> > > write. Then from the cramfs[mtdblock2] I want to access those files in
> > > [yaffs]mtdblock3 to perform read/write. For example I have the
> > > following instruction, in my source code [mtdblock2], to open the file
> > > in mtdblock3: FILE*ft = fopen("/dev/mtdblock3/myfile.txt", "r+"); So I
The mount point is where the files show up in the directory structure. You
should be opening the file: "/mnt/myfile.txt".
> > > get I get the error! If the file myfile.txt is in mtdblock3 yaffs
> > > partition, is its directory written as: /dev/mtdblock3/myfile.txt?
> >
> > I am curious about the file names. Are those you are really using?
> > It does not look like you have mounted the yaffs partition. Once you have
> > mounted the partition, the files become available at the mount pooint,
> > not on the partition.
> >
> > When you type "mount" on a console, what do you get?
>
> When typing mount on a console, just after boot-up, I get the following:
> rootfs on / type rootfs (rw)
> /dev/root on / type cramfs (ro)
> proc on /proc type proc (rw)
> none on /tmp type ramfs (rw)
> mdev on /dev type ramfs (rw)
> sysfs on /sys type sysfs (rw)
> which shows that mtdblock3 is not mounted
>
> I then typed: $mount -t yaffs /dev/mtdblock3 /mnt/, followed by: $mount
> This is what I got: /dev/root on / type cramfs (ro)
> proc on /proc type proc (rw)
> none on /tmp type ramfs (rw)
> mdev on /dev type ramfs (rw)
> sysfs on /sys type sysfs (rw)
> /dev/mtdblock3 on /mnt type yaffs (rw)
> which shows that mtdblock3 is NOW mounted!
>
> Now in the yaffs mount point /mnt, I have a file myfile.txt which I want to
> read and write from within the cramfs file system. So I now see that I can
> open the file by using the instruction: fopen("/dev/mtdblock3/myfile.txt",
> "r+");
>
> The problem now is that I want mtdblock3 to be mounted automatically during
> boot-up, I included the following instruction in the /etc/fstab file:
> /dev/mtdblock3 /mnt/ yaffs defaults 0 0
> But during boot-up I get the following error message: mount: mounting
> mtdblock3 on /mnt/ failed: No such file or directory The /dev/mtdblock3 and
> /mnt directories exist!!!!
What does dmesg say?
Try turning on some more yaffs tracing and see what info that gives you.
> I even issued the following instruction in the /etc/init.d/rcS file but
> couldnt get any help!!!: /bin/mount -t yaffs /dev/mtdblock3 /mnt/
>
> Any idea of how I can solve the problem?
>
> > > > > 2)When the cramfs file system is configured to be the root after
> > > > > kernel boot-up, i have read that i can mount the yaffs to mtdblock3
> > > > > partition by using the command mount -t yaffs /dev/mtdblock3 /mnt/.
> > > > >
> > > > > In the /mnt directory, i get the empty yaffs folder. As i was
> > > > > researching about how to get going with yaffs i got a couple yaffs
> > > > > source code which i dont know how to use them. Please help, how do
> > > > > i get a yaffs file system in the nand partition.
> > > >
> > > > First, start off with an empty flash (before you mouint yaffs). You
> > > > can use flash_eraseall to do this. Mount yaffs, then copy the files
> > > > in from another source.
> > > > -- Charles
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