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This is an Atari Lynx LNX ROM header generation utility. It can be used to create an ASM file containing the 64 byte LNX header to use with CC65.
lnxhdr.s

.import __BANK0BLOCKSIZE__
.import __BANK1BLOCKSIZE__
.export __EXEHDRUSR__: absolute = 1

.segment "EXEHDRUSR"

.byte    'L','Y','N','X'
.word    __BANK0BLOCKSIZE__
.word    __BANK1BLOCKSIZE__
.word    $X
.asciiz  "X"
.asciiz  "X"
.byte    $X
.byte    $X
.byte    %X
.byte    0, 0, $52
LNX ROM Header Fields - 64 Byte Header

Byte  0 -  3  | Char literal   | "LYNX"                      EEPROM byte-bits encode details of EEPROM used
      4 -  5  | 16-bit uchar   | Bank 0 page size            bit  1   2   3   4   5   6   7   8
      6 -  7  | 16-bit uchar   | Bank 1 page size                 |       |   |       |   |   |
      8 -  9  | 16-bit uchar   | Version number                   +---+---+   +---+---+   |  16/8 BIT
     10 - 41  | String + \0    | Cart name                            |           |     REAL/SD
     42 - 57  | String + \0    | Manufacturer                    EEPROM TYPE    UNUSED 
          58  | uchar          | Rotation (1=left, 2=right)
          59  | uchar          | AUDIN Used (1=yes)          Example: 0x40 (00000010) no-EEPROM, SD card saves
          60  | uchar          | EEPROM detail, see right    EEPROM Type values - 0: no EEPROM, 1: 93C46
     61 - 63  | uchar          | Unused                           2: 93C56, 3: 93C66, 4: 93C76, 5: 93C86
                                                             EEPROM size is 2^(type+9)
                                                                  e.g. 2^(1+9) = 1024 bits for 93C46
                                                             Lynx is little-endian so bit order is reversed.
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