Add drivers/block and arch/i386/interface/pcbios

src/Makefile

 #SRCDIRS		+= image
 SRCDIRS		+= drivers/bus
 SRCDIRS		+= drivers/net
+SRCDIRS		+= drivers/block
 #SRCDIRS		+= drivers/disk 
 SRCDIRS		+= interface/pxe
 

src/arch/i386/Makefile

 SRCDIRS		+= arch/i386/drivers/bus
 SRCDIRS		+= arch/i386/drivers/net
 SRCDIRS		+= arch/i386/drivers/disk
+SRCDIRS		+= arch/i386/interface/pcbios
 
 # The various xxx_loader.c files are #included into core/loader.c and
 # should not be compiled directly.