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x86: documentation fix regarding boot protocol 

Impact: clarify documentation

Documentation/x86/boot.txt describes payload_offset as the offset
from the end of the real-mode code. In fact, it is more accurately
described as the offset from the beginning of the protected-mode
code, as (a) this is how it is actually calculated and (b) the padding
after the real-mode code is not included in the offset.

Signed-off-by: Philipp Kohlbecher <xt28@gmx.de>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Philipp Kohlbecher 2008-12-14 18:50:01 +01:00 committed by Ingo Molnar
parent 78f902ccc5
commit e1286f2c68
1 changed files with 2 additions and 2 deletions
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Documentation/x86/boot.txt
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@ -537,8 +537,8 @@ Type: read
Offset/size: 0x248/4 Offset/size: 0x248/4
Protocol: 2.08+ Protocol: 2.08+
If non-zero then this field contains the offset from the end of the If non-zero then this field contains the offset from the beginning
real-mode code to the payload. of the protected-mode code to the payload.
The payload may be compressed. The format of both the compressed and The payload may be compressed. The format of both the compressed and
uncompressed data should be determined using the standard magic uncompressed data should be determined using the standard magic