[ts-7000] Re: running root filesystem from ramdisk

["Hamish Avery" <>]

> You can try looking at OpenWrt - http://www.openwrt.org - they ship a
> squashfs image that can be updated to a small jffs2 partition.
> 
> I'm not really sure how that's done.  squashfs is read-only by
> definition; to change it you have to rebuild a new image and reflash
> the board.  OpenWrt uses some sort of symlink magic to allow 
> 'updates'.
> 
> I'm not sure if that's what you're looking for, though.  Do you need
> to update any arbitrary file on the system? Or just a few?
> 

Hi Yan,

Thanks for the idea.  What I am concerned about is if we move to add
features that require a lot more floating point math then we'll have
to move to get the cruch core going - currently I use a soft-float
kernel and libraries.  In that case, we'd need to update all the
libraries and busybox etc.  

With a ramdisk system, one just updates the image file and reboots. 
Simple!  But with a typical system one must create a new FS, pivot to
that, then update the original one.  I am thinking that given the
difficulties in getting the system to run from a ramdisk, I will just
end up doing what you and Bas recommend and run from an expanded FS
with tmpfs for /var and /tmp.  I can then make a ramdisk from the
running system, install a basic OS, switch to that then update the FS
on the SD card and reboot...  

Many thanks for your help.

/hamish



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