> I think it fair that they assume some linux knowledge and essentially
> concentrate on where there product has specifics.
I agree, and I have some linux knowledge. Alas, tmpfs is new, and I'm
trying to learn how (or it) it is implemented on the TS-7250.
> You don't "switch on " features in the linux kernel like you
> indicate. You may pass parameters/variables.
That's what I meant; sorry I wasn't more clear.
> tmpfs is not an alternative to ramdisks. A kernel can support both.
Agreed. But my question was, if tmpfs is used is it still NECESSARY to
do the stuff with ramdisk? My Google search results seem to indicate
it is not. It appears that tmpfs doesn't require (for example) a
/dev/ram device or creating a filesystem on it. tmpfs appears to be a
complete filesystem itself, and is ready for mounting.
> If the kernel was compiled with tmpfs it is there - period.
> There is a list of inbuild filesystems that the current kernel supports
> cat /proc/filesystems
Thank you; I'll check that out.
> I'm at home so I've just checked the config file for my last
> kernel build (last Xmas! boxing day actually - sad) and it appears
> the TS build doesn't enable TMPFS. As far as I remember, I only
> enabled a couple of kernel options ontop of the basic TS build.
> It appears that RAMFS support is built in.
I'm starting to believe the kernel was built without tmpfs. Last night
I was able to mount two ramfs points just fine, but not tmpfs. It
appears that ramfs will work the same as tmpfs for my application. All
I need is a place to put volatile files while I mount the root
filesystem read-only.
> Does /dev/ram1 /dev/ram2 etc exist?
No. My board has no /dev/ram... devices. However, this doesn't stop
mount from mounting ramfs points:
mount -t ramfs none /mnt/my_ramfs -o maxsize=512
This works perfectly; I can copy files to /mnt/my_ramfs and open them
in vi. Adding this line to /etc/fstab mounts the point at boot time:
none /mnt/my_ramfs ramfs maxsize=512 0 0
So I think I'm getting close to what I need. I'm still curious about
tmpfs on the TS-7250 (since the Techologic document showed how it
should work), but if ramfs works, I'll take that.
Thanks for your information and suggestions.
Mike
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