Where is flash size defined?

[Mark Ter Morshuizen]

Hi,

I'm trying to get some Mikrotik devices supported. When I build for 
Mikrotik SXT 2nD R3 (with 16M flash) I get the following error:

"WARNING: Image file 
/home/mark/openwrt/build_dir/target-mips_24kc_musl/linux-ath79_mikrotik/tmp/openwrt-ath79-mikrotik-mikrotik_routerboard-sxt-2nd-r3-squashfs-sysupgrade.bin 
is too big: 6684676 > 0"

Obviously 6684676 is indeed greater than 0, but where is the 0 coming from?

Thanks,

-- 
Mark Ter Morshuizen