From: "Alexander Shiyan" <shc_work@mail.ru>
To: "Maxime Ripard" <maxime.ripard@free-electrons.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH] Revert "ARM: Use armlinux_bootparams address for DTB"
Date: Wed, 07 Aug 2013 16:06:24 +0400 [thread overview]
Message-ID: <1375877184.576122343@f176.i.mail.ru> (raw)
In-Reply-To: <20130807113740.GD2911@lukather>
> On Wed, Aug 07, 2013 at 01:55:42PM +0400, Alexander Shiyan wrote:
> > > This patch placed the flattened devicetree to armlinux_bootparams.
> > > armlinux_bootparams normally is at SDRAM_START + 0x100. The kernels
> > > initial page tables are normally at SDRAM_START + 0x4000, so the
> > > flattened devicetree gets overwritten once it exceeds 0x3f00 bytes
> > > which is quite common.
> > >
> > > Revert this patch for now once a better solution can be found
> >
> > In such a case, tree may be placed immediately after the kernel?
> > It can also serve as an automatic option "ARM_APPENDED_DTB".
>
> That won't work either, since the DTB will be overwritten by the kernel
> decompressor.
arch/arm/Kconfig:
...
config ARM_APPENDED_DTB
bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
depends on OF && !ZBOOT_ROM
help
With this option, the boot code will look for a device tree binary
(DTB) appended to zImage
(e.g. cat zImage <filename>.dtb > zImage_w_dtb).
...
So, DTB is placed immediately after the kernel.
---
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next prev parent reply other threads:[~2013-08-07 12:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 9:45 Sascha Hauer
2013-08-07 9:55 ` Alexander Shiyan
2013-08-07 10:11 ` Sascha Hauer
2013-08-07 10:34 ` Alexander Shiyan
2013-08-08 7:17 ` Alexander Shiyan
2013-08-09 6:58 ` Sascha Hauer
2013-08-09 7:02 ` Alexander Shiyan
2013-08-09 8:02 ` Sascha Hauer
2013-08-07 11:37 ` Maxime Ripard
2013-08-07 12:06 ` Alexander Shiyan [this message]
2013-08-07 12:40 ` Maxime Ripard
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