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Commit 6c020ea8 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Will Deacon
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arm64/Documentation: clarify wording regarding memory below the Image 



Clarify that the memory below the start of the image but inside the
region covered by the linear mapping has no special significance to
the kernel, and may be used by the firmware provided that it is marked
as reserved.

Also, fix up some whitespace errors.

Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 484c96db

Documentation/arm64/booting.txt

+7 −4
Original line number Diff line number Diff line
@@ -115,11 +115,14 @@ The Image must be placed text_offset bytes from a 2MB aligned base 
address near the start of usable system RAM and called there. Memory

below that base address is currently unusable by Linux, and therefore it

is strongly recommended that this location is the start of system RAM.

The region between the 2 MB aligned base address and the start of the

image has no special significance to the kernel, and may be used for

other purposes.

At least image_size bytes from the start of the image must be free for

use by the kernel.



Any memory described to the kernel (even that below the 2MB aligned base

address) which is not marked as reserved from the kernel e.g. with a

Any memory described to the kernel (even that below the start of the

image) which is not marked as reserved from the kernel (e.g., with a

memreserve region in the device tree) will be considered as available to

the kernel.