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arm64: Add page size to the kernel image header

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This patch adds the page size to the arm64 kernel image header
so that one can infer the PAGESIZE used by the kernel. This will
be helpful to diagnose failures to boot the kernel with page size
not supported by the CPU.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Suzuki K. Poulose <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
This commit is contained in:
Ard Biesheuvel 2015-10-19 14:19:36 +01:00 • committed by Catalin Marinas
commit 9d372c9fab
2 changed files with 10 additions and 2 deletions
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7
Documentation/arm64/booting.txt
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@ -104,7 +104,12 @@ Header notes:
- The flags field (introduced in v3.17) is a little-endian 64-bit field
composed as follows:
Bit 0: Kernel endianness. 1 if BE, 0 if LE.
Bits 1-63: Reserved.
Bit 1-2: Kernel Page size.
0 - Unspecified.
1 - 4K
2 - 16K
3 - 64K
Bits 3-63: Reserved.
- When image_size is zero, a bootloader should attempt to keep as much
memory as possible free for use by the kernel immediately after the