Document memmap option better

[Pavel Machek]

Provide example for memmap exclude option (it is slightly strange an
non-trivial) and provide nice small HOWTO for people with bad
memory.

Signed-off-by: Jan-Simon Moeller <dl9pf@xxxxxx>
Signed-off-by: Pavel Machek <pavel@xxxxxxx>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 622f784..467034c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1128,6 +1128,10 @@ and is between 256 and 4096 characters. 
 	memmap=nn[KMG]$ss[KMG]
 			[KNL,ACPI] Mark specific memory as reserved.
 			Region of memory to be used, from ss to ss+nn.
+			Example: Exclude memory from 0x18690000-0x1869ffff
+			         memmap=64K$0x18690000
+			         or
+			         memmap=0x10000$0x18690000
 
 	meye.*=		[HW] Set MotionEye Camera parameters
 			See Documentation/video4linux/meye.txt.

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