Re: [U-Boot] device tree compilation problems.

Dear Simon Glass,

In message CAPnjgZ3s2+w0PPyUh8c4JqgSEmSbZwWDeqBqUWKz_Bf1O0O6UQ@mail.gmail.com you wrote:

...

$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts

•   cat $< | $(CPP) -P $(DTS_CPPFLAGS) - >$@.tmp
  

•   $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} $@.tmp
  

•   rm $@.tmp
  

...

The lines above are running the .dts file through the C proprocessor to create a tmp file, which is then compiled. It is only really used to get the name of the SOC's device tree include file - see the definition of DTS_CPPFLAGS.

Is there actually any reason for the "cat" (the UUOCA seems to be extinct these days, cf. http://partmaps.org/era/unix/award.html) and the tmp file?

Why not rewriting as

$(CPP) -P $(DTS_CPPFLAGS) < $< | \ $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} -

?

Best regards,

Wolfgang Denk