[U-Boot] U-Boot Makefile question
Steven Zedeck
saz at proliphix.com
Tue Feb 17 14:43:31 CET 2009
Hi all,
I am new to u-boot. But I am ramping up pretty fast. My primary issue is
understanding the Makefile syntax. Is there a good tutorial somewhere that
explains how u-boot uses the Makefiles and their syntax?
For example, I'm having problems understanding what this means in a
Makefile:
COBJS-$(CONFIG_HAS_DATAFLASH) += at45.o
COBJS-$(CONFIG_FLASH_CFI_DRIVER) += cfi_flash.o
COBJS-$(CONFIG_HAS_DATAFLASH) += dataflash.o
COBJS-$(CONFIG_FLASH_CFI_LEGACY) += jedec_flash.o
COBJS-$(CONFIG_MW_EEPROM) += mw_eeprom.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
This is from drivers/mtd/Makefile.
How does COBJS get initially defined upon entry into the Makefile?
Does at45.o get added to the list of objects to be built only if the
CONFIG_HAS_DATAFLASH flag is set?
What does the "-" sign mean before the "$" ?
What does this mean? COBJS := $(COBJS-y)
I'm sorry for the "dumb" questions. Any help with the understanding of
Makefiles would be greatly appreciated.
Thanks in advance,
Steve
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