I've written a little game and want to add a save state to it.

By writing to memory from 0xE000000 onwards a byte at a time I can see the
values being written to the .SAV file that VisualBoyAdvance automatically
creates.

If I put my ROM image into EZ-Client v1.08a (for use on an XG flash cart) it
defaults to having 0kB of RAM allocated to it while various other ROM images
have predefined RAM amounts. By manually setting this value to 128kB,
running the game and then saving the RAM out from the cart I can see the
values being saved to it so things seem to be working fine.

So, how do I change my ROM image file to define the amount of RAM it should
use on the flash cart?

Cheers
Dave