From mboxrd@z Thu Jan 1 00:00:00 1970 From: grant.likely@secretlab.ca (Grant Likely) Date: Fri, 19 Feb 2010 12:27:00 -0700 Subject: [PATCH 1/7] arm-dt: Add ATAG_DEVTREE tag In-Reply-To: <20100219185953.15318.4850.stgit@angua> References: <20100219185953.15318.4850.stgit@angua> Message-ID: <20100219192646.15318.93865.stgit@angua> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Jeremy Kerr We'd like to provide a pointer to the device tree blob through the atags mechanism, so add a tag type containing a physical dtb pointer. We won't need a parser for this, as we'll need to do the devtree parsing a little earlier than other tags. Signed-off-by: Jeremy Kerr Signed-off-by: Grant Likely --- arch/arm/include/asm/setup.h | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h index dfa9ddf..ee77cec 100644 --- a/arch/arm/include/asm/setup.h +++ b/arch/arm/include/asm/setup.h @@ -126,6 +126,14 @@ struct tag_cmdline { char cmdline[1]; /* this is the minimum size */ }; +/* flattened device tree blob pointer */ +#define ATAG_DEVTREE 0x5441000a + +struct tag_devtree { + __u32 start; /* physical start address */ + __u32 size; /* size of dtb image in bytes */ +}; + /* acorn RiscPC specific information */ #define ATAG_ACORN 0x41000101 @@ -155,6 +163,7 @@ struct tag { struct tag_revision revision; struct tag_videolfb videolfb; struct tag_cmdline cmdline; + struct tag_devtree devtree; /* * Acorn specific