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

>... Mark's idea to create a ramdisk on /dev/rd once the system
>is up and then expand a compressed root filesystem into that and
>switch to it.  It's slow and IMHO needlessly complicated though, and
>the simplist option by far is to boot into a ramdisk. 

As far as I can tell, quite a lot of the linux boot sequence is slow
and needlessly complicated.  :)

(That's no reason to make it any worse than it has to be, though...)

>Mark, you are correct that the RAM comes in 8Mb banks, but the error
>is posted before the memory is detected.  I tried again with a much
>smaller ramdisk sizes (<5Mb then <2.3Mb).  Again, the same error.  The
>smallest ramdisk attempt reports:

Hmm... That's odd.  You would think something that small would work.

In my previous email, I gave the wrong file name for where that
error message seems to be coming from.  The correct location is
arch/arm/mm/init.c in check_initrd().  

I looked at it again today, and it looks like maybe mi->bank[] is a
description of all the regions of physical memory in the system.  Near the
end of bootmem_init(), I think the call to reserve_bootmem_node() is
declaring the RAM occupied by the initrd to be unavailable to the system.

You might want to get in to your kernel sources and print the values of
phys_initrd_start and end, and the values it is comparing to in mi->bank[].
That would at least give you some insight into what the system thinks
the problem is.

Mark S.


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