linux-kernel - RE: [PATCHv1 01/12] unicore32 core architecture: build infrastructure

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Message-ID: <002201cbb0bf$a20e9d60$e62bd820$@mprc.pku.edu.cn>
Date:	Mon, 10 Jan 2011 20:12:18 +0800
From:	"Guan Xuetao" <guanxuetao@...c.pku.edu.cn>
To:	"'Sam Ravnborg'" <sam@...nborg.org>
Cc:	"'Paul Mundt'" <lethal@...ux-sh.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCHv1 01/12] unicore32 core architecture: build	infrastructure



> -----Original Message-----
> From: Sam Ravnborg [mailto:sam@...nborg.org]
> Sent: Saturday, January 08, 2011 7:48 PM
> To: Guan Xuetao
> Cc: 'Paul Mundt'; linux-arch@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCHv1 01/12] unicore32 core architecture: build infrastructure
> 
> > > > +textofs-y	:= 0x00408000
> > > > +
> > > > +# The byte offset of the kernel image in RAM from the start of RAM.
> > > > +TEXT_OFFSET := $(textofs-y)
> > >
> > > If you are going to have different TEXT_OFFSET's then I suggest to move
> > > this to KConfig as an "hex "Text offset" config option.
> > > You can set default values dependign on BSP etc.
> > There is no different TEXT_OFFSET.
> >
> > >
> > > Also defiing stuff here just to export it for use in boot/
> > > has always looked like a strange concept - but many archs do so today.
> > > You do not export TEXT_OFFSET but I guess this is a bug?
> > I need TEXT_OFFSET for kernel/ and boot/, so export it.
> 
> I would suggest to move this to you Kconfig file.
> something like this:
> 
> # The byte offset of the kernel image in RAM from the start of RAM
> config UNICORE32_TEXT_OFFSET
> 	hex
> 	default 0x00408000
> 
> Then you have the symbol available as CONFIG_UNICORE32_TEXT_OFFSET
> both in your Makefiles and in your source files.
Thanks.
Because TEXT_OFFSET is not changed in different machines or in configuration time,
I move it into mach-spec memory.h and rename it KERNEL_IMAGE_START.

Guan Xuetao

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