[cc65] Maximum application size

Hi all,

i'm trying to port one of my applications to the c64 using cc65.
Problem is that it is pretty much code, so i need every byte i
can find. Currently i have about 80% ported and got a "Memory area 
overflow in 'RAM', Segment 'BSS' (718 bytes)".

What possibilities exist to handle that situation?

I'd like to keep using a single PRG-File as long as possible...

 From the MAP-File:

Segment list:
-------------
Name                  Start   End     Size
--------------------------------------------
ZEROPAGE              000002  00001B  00001A
STARTUP               0007FF  000892  000094
INIT                  000893  000928  000096
CODE                  000929  009834  008F0C
RODATA                009835  00A050  00081C
DATA                  00A051  00ADA3  000D53
BSS                   00ADA4  00D2CD  00252A

When reading the C64 memory map, we basically have:

0400 Screen memory
0800 basic
A000 basic rom
C000 upper RAM
D000 char rom/vic/sid
D800 color RAM
DC00 CIA
DE00 I/O-Area
E000 Kernal ROM

The prg currently has a filesize 38.652 bytes. I've seen working
PRGs with up to 59kB so it should be possible...

My app configures the VIC area so it has its screen at 0xE400,
colors at 0xD800, using its own charset at 0xE800, and three
sprites at 0xCF00 (which should conflict with code..mhhh).

So, could i:

1) load the app to 0400 instead of 0800 and still start it normally?
2) could i switch i/o-area and/or Kernal to RAM and use these areas for 
code? (how much of the kernal is needed - i need to use file-i/o?)
3) is it possible to split code into non-continous memory regions 
(without doing it "by hand" in assembly)
4) i have a 2k const array for the charset - what is the best method for 
  not wasting that memory, after the charset has been copied to its 
final destination. Can i locate one of my global arrays of structs at the
same location?
5) can i place the arrays with sprite data at a 64 byte boundary so they 
can be used directly without relocating?
6) Other suggestions?

thanks,
   Andreas


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