From: u.kleine-koenig@pengutronix.de (Uwe Kleine-König)
To: linux-arm-kernel@lists.infradead.org
Subject: defining ZRELADDR as PHYS_OFFSET + TEXT_OFFSET
Date: Wed, 27 Jan 2010 11:12:28 +0100 [thread overview]
Message-ID: <20100127101228.GA17421@pengutronix.de> (raw)
Hello,
currently all platforms need to define zreladdr-y in
arch/arm/mach-$mach/Makefile.boot and PHYS_OFFSET (in
arch/arm/mach-$mach/include/mach/memory.h).
Constraints for these are:
TEXTADDR = PAGE_OFFSET + TEXT_OFFSET
__virt_to_phys(virt) = virt - PAGE_OFFSET + PHYS_OFFSET (at least for
"small" virtual addresses)
ZRELADDR = __virt_to_phys(TEXTADDR)
(The equallity for __virt_to_phys only holds "normaly" according to
http://lists.arm.linux.org.uk/lurker/message/20010723.185051.94ce743c.en.html.
In practice it holds for addresses of the first bank of RAM which is
enough for the purposes of this mail.)
So we can deduce ZRELADDR = PHYS_OFFSET + TEXT_OFFSET.
Is there something I missed or is it possible to get rid of zreladdr-y
in .../Makefile.boot and define it according to the equation above?
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-K?nig |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next reply other threads:[~2010-01-27 10:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-27 10:12 Uwe Kleine-König [this message]
2010-01-28 0:15 ` defining ZRELADDR as PHYS_OFFSET + TEXT_OFFSET Russell King - ARM Linux
2010-02-01 1:24 ` George G. Davis
2010-02-01 8:49 ` Uwe Kleine-König
2010-02-05 8:26 ` George G. Davis
2010-02-05 9:10 ` Uwe Kleine-König
2010-02-05 14:14 ` George G. Davis
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