Documentation/arm64: clarify requirements for DTB placement

The current description of DTB placement requirements does not quite
match the kernel code in head.S: __vet_fdt and __create_page_tables.
This patch tweaks the text to match the actual requirements placed on
it by the code.

Signed-off-by: Mark Salter <>
Acked-by: Will Deacon <>
Signed-off-by: Catalin Marinas <>
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index 5273c4d..98df4a0 100644
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -45,9 +45,9 @@
 Requirement: MANDATORY
-The device tree blob (dtb) must be no bigger than 2 megabytes in size
-and placed at a 2-megabyte boundary within the first 512 megabytes from
-the start of the kernel image. This is to allow the kernel to map the
+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.