RB153 evbmips kernel won't load on RouterBoard 532

Hi guys.

I'm trying to boot evbarm kernel for RouterBoard 532 but the loader does 
not accept either the ELF nor the srec kernels.
Any ideas what can be wrong?

Booting the ELF kernel:

RouterBOOT booter 1.5

RouterBoard 532

CPU frequency: 330 MHz
   Memory size:  32 MB

Press any key within 3 seconds to enter setup...
trying dhcp protocol........................ OK
resolved mac address 00:50:45:00:B1:D7
Gateway: 192.168.99.1
*********************transfer started ............*............*.... 
transfer ok, time=4.5s
setting up elf image... wrong architecture elf image
kernel loading failed


Booring SREC kernel:

trying dhcp protocol... OK
resolved mac address 00:50:45:00:B1:D7
Gateway: 192.168.99.1
transfer started .....................*....... transfer ok, time=1.6s
setting up elf image... wrong architecture elf image
kernel loading failed


I am on CURRENT 5.99.26 and the kernel config is RB153 compiled with
./build.sh -m evbmips-eb -O /usr/mips/obj/ -T /usr/mips/tools/ kernel=RB153


Cheers,
Marcin