##
# This is a very minimalistic linker configuration for UNROM chips. This
# configuration assumes the standard UNROM configuration, with two regions
# defined that split $8000-$FFFF, where the first half is swappable. For the
# bank switching there are 7 banks, which coupled with the fixed region it sums
# up 128KB of total PRG-ROM.
#
# NOTE: it assumes that only assembly is being used, and thus a lot of magic
# required for C programs is missing.
# NOTE: it is following the example of games such as Castlevania or Megaman.
# Thus, there is no CHR segment because it's all done through RAM.

MEMORY {
    # iNES header.
    HEADER: start = $0, size = $10, fill = yes;

    # Program RAM. Available if a battery-backed RAM was requested.
    WRAM: start = $6000, size = $2000, define = yes;

    # Swappable ROM addresses. Note the filled values. This is done so it's also
    # clear by inspecting the memory which bank we are on. This can come in
    # handy when inspecting things with an hex editor.
    PRG0: start = $8000, size = $4000, fill = yes, fillval = $f8, define = yes;
    PRG1: start = $8000, size = $4000, fill = yes, fillval = $f9, define = yes;
    PRG2: start = $8000, size = $4000, fill = yes, fillval = $fa, define = yes;
    PRG3: start = $8000, size = $4000, fill = yes, fillval = $fb, define = yes;
    PRG4: start = $8000, size = $4000, fill = yes, fillval = $fc, define = yes;
    PRG5: start = $8000, size = $4000, fill = yes, fillval = $fd, define = yes;
    PRG6: start = $8000, size = $4000, fill = yes, fillval = $fe, define = yes;

    # Fixed ROM address.
    PRG: start = $C000, size = $4000, fill = yes, fillval = $ff, define = yes;
}

SEGMENTS {
    # iNES header.
    HEADER: load = HEADER, type = ro;

    # This is the fixed bank, that spans $C000-$FFFF. Make sure to put the reset
    # code and basic stuff that you don't want ever to be gone here. This will
    # include stuff like the reset code, bank switching utilities, etc.
    FIXED: load = PRG, type = ro, define = yes;

    ##
    # Swappable banks.

    BANK0: load = PRG0, type = ro, define = yes;
    BANK1: load = PRG1, type = ro, define = yes;
    BANK2: load = PRG2, type = ro, define = yes;
    BANK3: load = PRG3, type = ro, define = yes;
    BANK4: load = PRG4, type = ro, define = yes;
    BANK5: load = PRG5, type = ro, define = yes;
    BANK6: load = PRG6, type = ro, define = yes;

    # Last but not least, the vectors must be the last thing and they are
    # expecting a very special place on the fixed bank.
    VECTORS: load = PRG, start = $fffa, type = ro;
}