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From: s.hauer@pengutronix.de (Sascha Hauer)
To: linux-arm-kernel@lists.infradead.org
Subject: i.MX consolidation patches
Date: Fri, 3 Jun 2011 16:18:09 +0200	[thread overview]
Message-ID: <20110603141809.GS23771@pengutronix.de> (raw)
In-Reply-To: <20110603121702.DB9E82FA@gemini.denx.de>

On Fri, Jun 03, 2011 at 02:17:02PM +0200, Wolfgang Denk wrote:
> Dear Sascha Hauer,
> 
> In message <20110603120258.GR23771@pengutronix.de> you wrote:
> >
> > > I'm not a friend of using magic values that are "totally-impossible".
> > > This is confusing, and here it is not needed.
> > 
> > I find using a field labelled 'entry point' and 'load address' as
> > absolute addresses or offsets into sdram depending on some flag
> > also quite confusing. btw how do you want to decide whether the
> > fields are offsets or absolute addresses? I see no flags field in
> > the uImage format.
> 
> I would define a new image type.  Instead of "-T kernel" we could for
> example use a new type "-T relkernel" to indicate that addresses are
> relative to start of system RAM.
> 
> > > If we could agree to interpret load address and entry point as
> > > offsets, the only remaining problem is to find out if we can use a
> > > common offset.
> > 
> > The zImages encapsulated in uImages are relocatable. So pick any offset
> > between 32k and 128MB into sdram like Russell explained. Higher values
> > are not desirable as this would break boards with less sdram.
> 
> What about the images without the preloader?  You know that U-Boot
> already provides all the needed code to perform the uncompressing, so
> it would be nice if we could avoid to include this into each and every
> image.  Is the raw kernel image, without the preloader, also
> relocatable and can be started at any address (keeping above
> restrictions in mind, of course)?

No, the raw image has to be started at
virt_to_phys(PAGE_OFFSET + TEXT_OFFSET) which is usually 32k into sdram.
Only some subarchs define it differently:

textofs-y := 0x00008000
textofs-$(CONFIG_ARCH_CLPS711X) := 0x00028000
textofs-$(CONFIG_PM_H1940)      := 0x00108000
textofs-$(CONFIG_SA1111) := 0x00208000

Sascha

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      reply	other threads:[~2011-06-03 14:18 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-19 16:47 Sascha Hauer
2011-05-19 16:47 ` [PATCH 1/8] ARM i.MX: fix last user of iomux.h and remove it Sascha Hauer
2011-05-19 16:47 ` [PATCH 2/8] ARM i.MX: define CLOCK_TICK_RATE to bogus value Sascha Hauer
2011-05-19 16:47 ` [PATCH 3/8] ARM i.MX: remove SoC defines around header includes Sascha Hauer
2011-05-19 16:47 ` [PATCH 4/8] ARM i.MX: dmav1: kill SoC ifdefs Sascha Hauer
2011-05-19 16:47 ` [PATCH 5/8] ARM i.MX Allow to compile together i.MX1/21/25/27 Sascha Hauer
2011-05-19 18:04   ` Uwe Kleine-König
2011-05-19 19:03     ` Sascha Hauer
2011-05-19 19:44       ` Nicolas Pitre
2011-05-19 19:50         ` Sascha Hauer
2011-06-01 13:22   ` [PATCH 5/8 v2] " Sascha Hauer
2011-06-01 13:25     ` Russell King - ARM Linux
2011-06-01 15:24     ` Arnd Bergmann
2011-06-01 16:47       ` Sascha Hauer
2011-06-01 17:59         ` Arnd Bergmann
2011-05-19 16:47 ` [PATCH 6/8] ARM i.MX mxc.h: use CONFIG_SOC_* instead of CONFIG_ARCH_* Sascha Hauer
2011-05-19 16:47 ` [PATCH 7/8] ARM i.MX debug macro: " Sascha Hauer
2011-05-19 16:54   ` Sergei Shtylyov
2011-05-19 19:07     ` Sascha Hauer
2011-05-19 16:47 ` [PATCH 8/8] ARM: mxc: update defconfigs Sascha Hauer
2011-05-30  7:57 ` i.MX consolidation patches Shawn Guo
2011-06-01 12:35   ` Sascha Hauer
2011-06-01 13:47     ` Russell King - ARM Linux
2011-06-01 14:18       ` Sascha Hauer
2011-06-01 14:24         ` Russell King - ARM Linux
2011-06-01 14:36           ` Sascha Hauer
2011-06-01 14:59             ` Uwe Kleine-König
2011-06-22  7:56           ` Sascha Hauer
2011-06-22  8:11             ` Russell King - ARM Linux
2011-06-22  8:32               ` Sascha Hauer
2011-06-22  9:03                 ` Russell King - ARM Linux
2011-06-22 14:58                   ` Sascha Hauer
2011-06-22 15:10                     ` Arnd Bergmann
2011-06-22 15:14                       ` Russell King - ARM Linux
2011-06-22 15:23                         ` Arnd Bergmann
2011-06-22 15:22                     ` Russell King - ARM Linux
2011-06-22 16:35                       ` Sascha Hauer
2011-06-01 21:08         ` Wolfgang Denk
2011-06-01 23:04           ` Matt Sealey
2011-06-02 10:34             ` Sascha Hauer
2011-06-02 11:23               ` Russell King - ARM Linux
2011-06-02 15:46             ` Wolfgang Denk
2011-06-02 23:59               ` Matt Sealey
2011-06-03 12:02               ` Sascha Hauer
2011-06-03 12:17                 ` Wolfgang Denk
2011-06-03 14:18                   ` Sascha Hauer [this message]

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