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Diffstat (limited to 'Documentation/arm64/booting.txt')
| -rw-r--r-- | Documentation/arm64/booting.txt | 10 |
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 ------------------------------ |