And with this it seems to actually work
.area _CODE2
.area _CONST
.area _INITIALIZED
- .area _SERIAL
.area _SERIALDATA
.area _DATA
.area _BSEG
.area _DISCARD
.area _INITIALIZER ; binman copies this to the right place for us
.area _COMMONMEM
+ .area _SERIAL
; exported symbols
.globl init
stop: halt
jr stop
+ .area _BOOT
+ jp init
-mwxuy
-i fuzix.ihx
--b _CODE=0x0100
+-b _CODE=0x0500
-b _DISCARD=0xD000
-b _COMMONMEM=0xEA00
+-b _SERIAL=0x0100
+-b _BOOT=0x0100
-l z80
platform-easy-z80/crt0.rel
platform-easy-z80/commonmem.rel