[Peeweelinux] Out of space, the 2003 remake

[Barry Gershenfeld]

Trying to copy a 13 MB ramdisk into memory simply runs out of
room on my 32 MB target.  So I switched the target model to:

   Read-only root fs with multiple ramdisks

This actually looks like a more efficient scheme.  In fact, I
already had plans to make another disk partition to stick 
all the static stuff into.  This does it for me.  But 
there's a problem.  Peewee runs out of space while copying 
to the initialized flash disk partition.  (This device is
64 MB so the problem's in the size calculations.)

I spent nearly a week trying to ascertain where the problem
is.  I didn't know anything about the scripts but I'm somewhat
familiar with the "target load" scripts now!  I have all the
calculations traced, but not all the logic.  I also searched
the archives, and the core of this adventure can be found
around 12/2000 and 01/2001, there was lots of messing with it
then.  There have been a few messages since then from other
people bumping into this.  Mostly, they find a way and move
on.

Here is my latest take:  The total filesystem size may be
calculated properly, but since the disk partition size
resolution is in Megabytes, attempting to add 10K here 
or 32k there just doesn't affect the final outcome.  
Furthermore, none of the "reserve space" options have any 
effect because they are only for the relocated ramdisk 
portions and not the root fs.  I am not sure
those calculations are correct either but I haven't worked
through them all.  The etc and dev sizes are subtracted
out but they are still contained in that root filesystem.
Anyway, it doesn't miss by much!

So, for archive purposes, I am passing along a reference 
on how I made it work for now.  Open the file pwl_target_load,
locate the function  func_rd_build_ro_root_rd () , then
find where the MB sizes are calculated.  Find this line:

    rd_size_fs=$((rd_size_fs / 1024 + 1))

That +1 will do it most of the time but if you run out of
space while copying, make the 1 a 2, or else add this 
line under it:

    # add one more
    rd_size_fs=$((rd_size_fs + 1 ))

And now, I, too, move on. :)

Barry