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-rw-r--r--Documentation/arm64/booting.txt10
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index f3c05b5f9f08..1690350f16e7 100644
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -45,11 +45,13 @@ sees fit.)
Requirement: MANDATORY
-The device tree blob (dtb) must be placed on an 8-byte boundary within
-the first 512 megabytes from the start of the kernel image and must not
-cross a 2-megabyte boundary. This is to allow the kernel to map the
-blob using a single section mapping in the initial page tables.
+The device tree blob (dtb) must be placed on an 8-byte boundary and must
+not exceed 2 megabytes in size. Since the dtb will be mapped cacheable
+using blocks of up to 2 megabytes in size, it must not be placed within
+any 2M region which must be mapped with any specific attributes.
+NOTE: versions prior to v4.2 also require that the DTB be placed within
+the 512 MB region starting at text_offset bytes below the kernel Image.
3. Decompress the kernel image
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