From mboxrd@z Thu Jan  1 00:00:00 1970
From: Albert ARIBAUD <albert.aribaud@free.fr>
Date: Fri, 28 Jan 2011 07:47:53 +0100
Subject: [U-Boot] [PATCH V7 1/5] mv: seperate kirkwood and armada from
 common setting
In-Reply-To: <AANLkTik-5KYbPsH2SMiqA-ZN88B7Kh+o7Q08WcUubqWB@mail.gmail.com>
References: <1295923240-26126-1-git-send-email-leiwen@marvell.com>	<1296037875-19684-2-git-send-email-leiwen@marvell.com>	<4D41BACB.9090506@free.fr>
	<AANLkTik-5KYbPsH2SMiqA-ZN88B7Kh+o7Q08WcUubqWB@mail.gmail.com>
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Hi Lei,

Le 28/01/2011 02:28, Lei Wen a ?crit :

>>> diff --git a/arch/arm/include/asm/arch-kirkwood/config.h b/arch/arm/include/asm/arch-kirkwood/config.h
>>> new file mode 100644
>>> index 0000000..7c6d63b
>>> --- /dev/null
>>> +++ b/arch/arm/include/asm/arch-kirkwood/config.h
>>> @@ -0,0 +1,145 @@

...

>>> +#ifndef CONFIG_SYS_KWD_CONFIG
>>> +#define      CONFIG_SYS_KWD_CONFIG   $(SRCTREE)/$(CONFIG_BOARDDIR)/kwbimage.cfg
>>
>> What are the '$()' operators doing here ?
>
> This definition is served as generating kirkwood special image, which
> I just move it from mv-common.h
> $(obj)u-boot.kwb:       $(obj)u-boot.bin
>                  $(obj)tools/mkimage -n $(CONFIG_SYS_KWD_CONFIG) -T kwbimage \
>                  -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) -d $<  $@

What I would like to understand is, the '$(X)' macro expansion operator 
indeed has meaning and makes sense for some tools such as Make, but not 
for a C preprocessor or compiler. Is this  config.h file included by a 
makefile somehow?

> Best regards,
> Lei

Amicalement,
-- 
Albert.