path: root/Documentation/devicetree/booting-without-of.txt
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authorGrant Likely <grant.likely@secretlab.ca>2011-02-14 08:13:20 -0700
committerGrant Likely <grant.likely@secretlab.ca>2011-02-14 08:13:20 -0700
commit7211da17785536bacd3171a28bc6a3853c8bb477 (patch)
tree958adbdd76ff67b29c2429ad63478675a75e00e4 /Documentation/devicetree/booting-without-of.txt
parent9830fcd6f6a4781d8b46d2b35c13b39f30915c63 (diff)
Revert "dt: add documentation of ARM dt boot interface"
This reverts commit 9830fcd6f6a4781d8b46d2b35c13b39f30915c63. The ARM dt support has not been merged yet; this documentation update was premature. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'Documentation/devicetree/booting-without-of.txt')
1 files changed, 0 insertions, 40 deletions
diff --git a/Documentation/devicetree/booting-without-of.txt b/Documentation/devicetree/booting-without-of.txt
index 9381a1481027..28b1c9d3d351 100644
--- a/Documentation/devicetree/booting-without-of.txt
+++ b/Documentation/devicetree/booting-without-of.txt
@@ -13,7 +13,6 @@ Table of Contents
I - Introduction
1) Entry point for arch/powerpc
- 2) Entry point for arch/arm
II - The DT block format
1) Header
@@ -226,45 +225,6 @@ it with special cases.
cannot support both configurations with Book E and configurations
with classic Powerpc architectures.
-2) Entry point for arch/arm
- There is one single entry point to the kernel, at the start
- of the kernel image. That entry point supports two calling
- conventions. A summary of the interface is described here. A full
- description of the boot requirements is documented in
- Documentation/arm/Booting
- a) ATAGS interface. Minimal information is passed from firmware
- to the kernel with a tagged list of predefined parameters.
- r0 : 0
- r1 : Machine type number
- r2 : Physical address of tagged list in system RAM
- b) Entry with a flattened device-tree block. Firmware loads the
- physical address of the flattened device tree block (dtb) into r2,
- r1 is not used, but it is considered good practise to use a valid
- machine number as described in Documentation/arm/Booting.
- r0 : 0
- r1 : Valid machine type number. When using a device tree,
- a single machine type number will often be assigned to
- represent a class or family of SoCs.
- r2 : physical pointer to the device-tree block
- (defined in chapter II) in RAM. Device tree can be located
- anywhere in system RAM, but it should be aligned on a 32 bit
- boundary.
- The kernel will differentiate between ATAGS and device tree booting by
- reading the memory pointed to by r1 and looking for either the flattened
- device tree block magic value (0xd00dfeed) or the ATAG_CORE value at
- offset 0x4 from r2 (0x54410001).
II - The DT block format