We have a board that is to be certified by a Chinese test lab, so I need to create an image based on the direct_test_mode sample.
In Zephyr v2.0.0 I created a custom board based on the nrf52840_qiaa.dtsi.
When first building the project I got an error about an undefined pp channel so I add CONFIG_NRFX_PPI=y to the proj.conf file.
e: app/libapp.a(dtm.c.obj): in function `gppi_init':
C:\ncs\MS88SF2_RadioTest\MS88SF2_RadioDirect\src\dtm.c:685: undefined reference to `nrfx_ppi_channel_alloc'
When I tried to build the project again, I get an error which seems to mean that I have not defined something used in the custom board's device tree.
C:\ncs\MS88SF2_RadioTest\MS88SF2_RadioDirect\src\main.c:69: undefined reference to `__device_dts_ord_57'

It does not make any senses line#69.
My dts file:

And my proj.conf fiel:

What am I missing?
Thanks David