macro defining 16-bit address offset from and offset

[Skacore Systems]

Hello !

I'm trying to get working following simple macro for hours, but still no success. I just want to define two bytes, 

one containing length of the data and the other one an address - but in words, and therefore divided / 2 ( or >> 1)

Is there any chances to get it working ? Please add me into CC i'm not subscribed.

.macro link_data astart, aend

    .byte \aend - \astart

    .byte \astart / 2

.endm

.globl eeprom_start

eeprom_start:

link_data Manufacturer_ID_String,  Manufacturer_ID_String_end

Manufacturer_ID_String:

.ascii  "Skacore Systems.\0"

Manufacturer_ID_String_end:

.globl eeprom_end

eeprom_end:

gas output:

as test.S -o test.o

test.S: Assembler messages:

test.S:26: Error: invalid sections for operation on `Manufacturer_ID_String' and `L0'