linux-kernel - Re: [PATCH 1/3] firmware: allow firmware files to be built into kernel image

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Date:	Fri, 23 May 2008 18:49:37 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org, aoliva@...hat.com,
	alan@...rguk.ukuu.org.uk, Abhay Salunke <Abhay_Salunke@...l.com>,
	kay.sievers@...y.org, Haroldo Gamal <gamal@...ernex.com.br>,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 1/3] firmware: allow firmware files to be built into
	kernel image

On Fri, 2008-05-23 at 18:21 +0200, Sam Ravnborg wrote:
> Hi David.
> 
> > +extern struct builtin_fw __start_builtin_fw[];
> > +extern struct builtin_fw __end_builtin_fw[];
> 
> Could have these in include/linux/sections.h where we
> collect other linker symbols?

Hm. But they're not 'extern char' like the other things in
asm-generic/sections.h; they're 'struct builtin_fw'. So I'd want to
include <linux/firmware.h> from asm-generic/sections.h in order to make
that work... I think the simple answer is 'no'.

We don't do this for PCI fixups either.

> > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> > index f054778..8d71a40 100644
> > --- a/include/asm-generic/vmlinux.lds.h
> > +++ b/include/asm-generic/vmlinux.lds.h
> > @@ -86,6 +86,13 @@
> >  		VMLINUX_SYMBOL(__end_pci_fixups_resume) = .;		\
> >  	}								\
> >  									\
> > +	/* Built-in firmware blobs */					\
> > +	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\
> > +		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\
> > +		*(.builtin_fw)						\
> > +		VMLINUX_SYMBOL(__end_builtin_fw) = .;			\
> > +	}								\
> > +									\
> Looks good.
> But do we need the firmware after init?
> In other owrds could it be inside a discard after init block?

If we don't want the firmware in-kernel at all times, stick it an
initrd :)

> 
> > +
> > +#define DECLARE_BUILTIN_FIRMWARE_SIZE(name, blob, size)			     \
> > +	static const struct builtin_fw __fw_concat(__builtin_fw,__COUNTER__) \
> > +	__used __attribute__((__section__(".builtin_fw"))) =		     \
> 
> Use __section():
> 
> > +	__used __section(.builtin_fw))) =		     \
> (See compiler.h IIRC).

Done. Thanks.

-- 
dwmw2

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