[U-Boot] non-needed objects added to resulting U-Boot image

Hello

I was building u-boot for ARM based custom board and I found that unused and no needed object files are built and linked to the resulting U-Boot image. For example, my board doesn't have PCI, PCMCIA, USB or Ethernet, but according to the build-log, corresponding archives have been built and linked:

drivers/net/libnet.a drivers/net/sk98lin/libsk98lin.a drivers/pci/libpci.a drivers/pcmcia/libpcmcia.a

and so on.

Don't think it is intended behavior, on the other hand I have not included any support for this modules in my configuration. What can be the reason, has anybody had this before?

Thanks.