linux-kernel - Re: [RFC] [PATCH] Device Tree on ARM platform

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Message-ID: <87r5ya8krg.fsf@macbook.be.48ers.dk>
Date:	Wed, 27 May 2009 20:26:43 +0200
From:	Peter Korsgaard <jacmet@...site.dk>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Robert Schwebel <r.schwebel@...gutronix.de>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	Timur Tabi <timur@...escale.com>, rmk@....linux.org.uk
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

>>>>> "Scott" == Scott Wood <scottwood@...escale.com> writes:

Hi,

 >> Just bundle the .dtb with the kernel and they'll always be in sync. I
 >> know this isn't really in the spirit of OF, but currently imho the
 >> only realistic solution.

 Scott> That removes the ability to use the device tree to pass information
 Scott> from the bootloader, such as MAC addresses and clock frequencies.  On
 Scott> the u-boot list, you'll find people trying such hacks (which were
 Scott> rightly NACKed) as passing the information in the device's volatile
 Scott> registers (which the Linux driver must then not reset) to deal with
 Scott> ARM Linux's lack of this ability.

No, with the multi-image support U-Boot has full access to the device
tree. E.G. I adjust the flash partition list defined in the .dtb in my
board's ft_board_setup() routine.

-- 
Bye, Peter Korsgaard
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