From 9d372c9fab34cd8803141871195141995f85c7f7 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 19 Oct 2015 14:19:36 +0100 Subject: arm64: Add page size to the kernel image header 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 Signed-off-by: Suzuki K. Poulose Acked-by: Catalin Marinas Reviewed-by: Christoffer Dall Acked-by: Mark Rutland Signed-off-by: Catalin Marinas --- Documentation/arm64/booting.txt | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'Documentation/arm64/booting.txt') diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt index 7d9d3c2286b2..aaf6d77e4148 100644 --- a/Documentation/arm64/booting.txt +++ b/Documentation/arm64/booting.txt @@ -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 -- cgit v1.2.3