On 05/13/14 16:04, Carruth, Rusty wrote:
Ok, pardon my dumbness, but let me back up a bit.
First, lets look at the switch/router things:
(And I should first ask what flash controller is being used – does it
automatically do ‘read scrub’ or other techniques to get around this
whole issue? If so, you don’t need to do anything…)
Can you log in (as root, or become root) on the switches/routers?
If so, can you ‘see’ all the files you’d have to change?
If so, why not copy ‘in place’. That is, copy the whole thing (or parts
of it) to a new directory, then rename everything to the new place.
So, for example, lets say you had /bin, /etc, and /var you wanted to do
this to. /bin has 200M, /etc has 10M, and /var has 1G. Your flash has
2G free.
So, ‘mkdir /bin.new /etc.new /var.new ; cd /bin ; tar cf – . | ( cd
/bin.new && tar xf - ) ;cd /etc; tar cf – . | (cd /etc.new && tar xf -)
; cd /var ; tar cf - . | (cd /var.new && tar xf -)’
That gets you 3 new dirs., /bin.new /etc.new and /var.new. Do your MD5
sums across the world and compare.
Now, rename everything: ‘mv /bin /bin.old ; /bin.old/mv /bin.new /bin ;
mv /etc /etc.old ; mv /etc.new /etc ; mv /var /var.old ; mv /var.new /var’.
Ok, so now new is new and old is old. Delete old as you see fit, but
probably after a reboot ;-)
Beware that when you move /bin suddenly you won’t have mv available any
more, so you have to say /bin.old/mv to be able to use it.
No new kernel needed.
On the other hand, if you have no choice but to make a kernel,
‘everything you need’ should be there when you get the kernel source.
Other than special hardware that requires special drivers, just ‘build
it and they will come’. Or rather, build it and it will run. All the
majic of linking and all that is taken care of for you. The only thing
where absolute addresses is needed is (as far as I can remember right
now) just hardware.
Good luck, Mr Phelps!
Rusty
If it that easy, then maybe migrate through the files in
something like 1K chunks with dd, writing the next 1K chunk
from the file in flash to a 1K file on RAM Disk then back.
I think this is just for the few files in /boot, to refresh
the kernel, yes? The kernel is running in RAM, so you can
write to it the kernel binary file in /boot while running.
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