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Subject[PATCH 1/7] arm-dt: Add ATAG_DEVTREE tag
Date
From: Jeremy Kerr <jeremy.kerr@canonical.com>

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 <jeremy.kerr@canonical.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---

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


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