Build failures for specific .dtb file on v6.5

[Chris Packham]

Hi,

In earlier kernel versions (just reconfirmed on v6.4) I can do

   make ARCH=arm O=build multi_v7_defconfig
   make ARCH=arm O=build armada-xp-db-dxbc2.dtb

and that one specific .dtb file will be generated.

With v6.5 (and master, currently 87dfd85c3892)  I get the following error

   make ARCH=arm O=build multi_v7_defconfig
   make ARCH=arm O=build armada-xp-db-dxbc2.dtb
   ...
   make[3]: *** No rule to make target 
'arch/arm/boot/dts/armada-xp-db-dxbc2.dtb'.  Stop.
   make[2]: *** [src/linux/Makefile:1469: armada-xp-db-dxbc2.dtb] Error 2
   make[1]: *** [src/linux/Makefile:234: __sub-make] Error 2
   make[1]: Leaving directory 'src/linux/build'
   make: *** [Makefile:234: __sub-make] Error 2

I wasn't entirely sure which mailing list to direct this at so I've cast 
the net fairly wide. I'll try to setup an automated bisect and report 
back if I narrow the problem down.

Thanks,
Chris