Re: RAM based filesystem in uclinux

Thanks that helps a lot..Thanks again..

On Sun, Mar 24, 2013 at 7:55 AM, Steve deRosier <[email protected]> wrote:

> Ashish,
>
> With respect, people here have already mentioned a couple of ways. The
> most common for non-embedded systems is a initramfs or initrd via a cpio
> archive. There's extensive documentation on this in
> Documentation/initrd.txt.
>
> Embedded systems typically _don't_ want a writable root filesystem.
> uClinux is typically setup with a romfs, and then a writeable ramfs located
> at /var.  If you're looking for a space to write temporary files during
> runtime, you'd probably want to do so there. Be aware of course that those
> go away at reboot.  And for that matter, typically the way the initramfs or
> initrd work is you may be able to write to  them, but on reboot any changes
> aren't persisted anyway.
>
> In my rc file:
> /bin/expand /etc/ramfs.img /dev/ram1
> mount -t ext2 /dev/ram1 /var
>
> There's also tmpfs. You can set one of those up (exist in 2.4??) and mount
> on some arbitrary mount point.
>
> For writable and persisting, you're going to need to use a real filesystem
> on some real media, either disk or flash. And if you don't need
> persistance, then I don't see why directing your temp files to an already
> writable space in /var or /tmp won't work.
>
> As for the exact configuration settings and all that... well, you're on a
> 2.4 kernel and nearly no one is bothering with that kernel anymore. Heck,
> I'm working on a 3.2 kernel and someone told me the other day that I'm way
> out-of-date. Anyway, since you're on a 2.4 kernel, I certainly don't
> remember the specific settings anymore, nor do I have one setup that way
> lying around to check for you. You're going to do some looking and some
> trial-and-error to figure out the correct settings. But I'd be shocked if
> there isn't some legacy how-to out there. And
> the aforementioned documentation should be sufficient.
>
> If you don't have a very compelling reason to stay on a 2.4 kernel you
> might want to consider upgrading. Especially if you're starting a new
> project.
>
> I hope that helps,
> - Steve
>
>
>
>
>
> On Sat, Mar 23, 2013 at 4:14 PM, Ashish Phogat <[email protected]>wrote:
>
>> Hi,
>> Could someone provide me the mechanism/configuration to have a RAM based
>> filesystem which is writable? My kernel is 2.4.
>>
>> Thanks for replying
>>
>>
>> On Sat, Mar 23, 2013 at 4:19 AM, Greg Ungerer <[email protected]
>> > wrote:
>>
>>> Hi Lennart,
>>>
>>> On 22/03/13 23:41, Lennart Sorensen wrote:
>>> > The fact we can recreate the cpio archive and update the uImage from
>>> > the kernel and cpio archive is great.  No recompile crap to deal with
>>> > the way romfs and such have tended to need.  For us building the kernel
>>> > and the filesystem are totally seperate issues.
>>>
>>> I don't follow you here. How does using a ROMfs mean that building
>>> the kernel and filesystem are not separate?
>>>
>>> Regards
>>> Greg
>>>
>>>
>>>
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