From cdd7857898c8d2a159118e663f59978e6b3542f2 Mon Sep 17 00:00:00 2001 From: Mark Salter Date: Fri, 29 Nov 2013 16:00:14 -0500 Subject: doc: arm64: add description of EFI stub support Add explanation of arm64 EFI stub and kernel image header changes needed to masquerade as a PE/COFF application. Signed-off-by: Mark Salter Signed-off-by: Leif Lindholm Acked-by: Grant Likely Acked-by: Catalin Marinas Signed-off-by: Matt Fleming --- Documentation/arm64/booting.txt | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation/arm64/booting.txt') diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt index beb754e87c65..37fc4f632176 100644 --- a/Documentation/arm64/booting.txt +++ b/Documentation/arm64/booting.txt @@ -85,6 +85,10 @@ The decompressed kernel image contains a 64-byte header as follows: Header notes: - code0/code1 are responsible for branching to stext. +- when booting through EFI, code0/code1 are initially skipped. + res5 is an offset to the PE header and the PE header has the EFI + entry point (efi_stub_entry). When the stub has done its work, it + jumps to code0 to resume the normal boot process. The image must be placed at the specified offset (currently 0x80000) from the start of the system RAM and called there. The start of the -- cgit v1.2.3