arm64: Expand arm64 image header

[karo-tx-linux.git] / Documentation / arm64 / booting.txt

diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index 9c4d388daddc2f32411cdf341a8c7649079cbba6..5273c4d60e656ade8e4bbc8852c105ed8cdd2b24 100644 (file)
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -68,13 +68,23 @@ Image target is available instead.
 
 Requirement: MANDATORY
 
-The decompressed kernel image contains a 32-byte header as follows:
+The decompressed kernel image contains a 64-byte header as follows:
 
-  u32 magic    = 0x14000008;   /* branch to stext, little-endian */
-  u32 res0     = 0;            /* reserved */
+  u32 code0;                   /* Executable code */
+  u32 code1;                   /* Executable code */
   u64 text_offset;             /* Image load offset */
+  u64 res0     = 0;            /* reserved */
   u64 res1     = 0;            /* reserved */
   u64 res2     = 0;            /* reserved */
+  u64 res3     = 0;            /* reserved */
+  u64 res4     = 0;            /* reserved */
+  u32 magic    = 0x644d5241;   /* Magic number, little endian, "ARM\x64" */
+  u32 res5 = 0;                /* reserved */
+
+
+Header notes:
+
+- code0/code1 are responsible for branching to stext.
 
 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