From: Shawn Guo <shawn.guo-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
To: Nicolas Pitre <nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org>
Cc: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 4/4] ARM: zImage: allow supplementing appended DTB with traditional ATAG data
Date: Tue, 21 Jun 2011 15:00:59 +0800 [thread overview]
Message-ID: <20110621070058.GA9228@S2101-09.ap.freescale.net> (raw)
In-Reply-To: <1308632955-11070-5-git-send-email-nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org>
On Tue, Jun 21, 2011 at 01:09:15AM -0400, Nicolas Pitre wrote:
> From: Nicolas Pitre <nicolas.pitre-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>
> Some old bootloaders can't be updated to a device tree capable one,
> yet they provide ATAGs with memory configuration, the ramdisk address,
> the kernel cmdline string, etc. To allow a device tree enabled
> kernel to be used with such bootloaders, it is necessary to convert those
> ATAGs into FDT properties and fold them into the DTB appended to zImage.
>
> Currently the following ATAGs are converted:
>
> ATAG_CMDLINE
> ATAG_MEM (up to 8 memory regions)
> ATAG_INITRD2
>
> If the corresponding information already exists in the appended DTB, it
> is replaced, otherwise the required node is created to hold it.
>
> The code looks for ATAGs at the location pointed by the value of r2 upon
> entry into the zImage code. If no ATAGs are found there, an attempt at
> finding ATAGs at the typical 0x100 offset from start of RAM is made.
> Otherwise the DTB is left unchanged.
>
> Thisstarted from an older patch from John Bonesio <bones-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>,
> with contributions from David Brown <davidb-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>.
>
> Signed-off-by: Nicolas Pitre <nicolas.pitre-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> ---
With this patch applied, I saw nothing coming from kernel on imx51
babbage serial port.
--
Regards,
Shawn
next prev parent reply other threads:[~2011-06-21 7:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-21 5:09 [PATCH 0/4] allow DTB to be appended to the ARM zImage with ATAG conversion Nicolas Pitre
[not found] ` <1308632955-11070-1-git-send-email-nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org>
2011-06-21 5:09 ` [PATCH 1/4] ARM: zImage: ensure it is always a multiple of 64 bits in size Nicolas Pitre
2011-06-21 5:09 ` [PATCH 2/4] ARM: zImage: Allow the appending of a device tree binary Nicolas Pitre
2011-06-21 5:09 ` [PATCH 3/4] ARM: zImage: make sure appended DTB doesn't get overwritten by kernel .bss Nicolas Pitre
2011-06-21 5:09 ` [PATCH 4/4] ARM: zImage: allow supplementing appended DTB with traditional ATAG data Nicolas Pitre
[not found] ` <1308632955-11070-5-git-send-email-nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org>
2011-06-21 7:00 ` Shawn Guo [this message]
2011-06-21 17:32 ` David Brown
2011-06-21 22:58 ` David Brown
2011-06-21 23:13 ` David Brown
[not found] ` <8ya7h8edbhc.fsf-AOX6H5vLt3Uj8izMo0bVsAC/G2K4zDHf@public.gmane.org>
2011-06-21 23:22 ` Warner Losh
2011-06-21 23:35 ` Nicolas Pitre
2011-06-21 21:59 ` [PATCH 0/4] allow DTB to be appended to the ARM zImage with ATAG conversion David Brown
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