this song is very chilling, it was made by someone else before Bob Marley, but I forgot 
did it, but well here it goes anyway.

tunning: Standard by the way :D

Intro, and chorus:
/--------------------------------------------------|
/--------------------------------------------------|
/--------------------------------------------------|
/--------------------------------------------------|
/----2-2-3-5-5-5------2-2-3-5-5-5--5-5-7-7-5-0-0-0-|
/-3-3-------------3--3-----------------------------|

after each stroke you mute the chord, either by palm muting or by not pressing hard the 
formation, only making the strumming sound.
/-3-x-3
/-3-x-3
/-4-x-4 X 20 add then intro
/-6-x-6
/---
/---
then this...
/-3-x-3-x-3-x-3-x-7-x-5-x-5-x-5-x-5-x-7-x-7-x-7-x-7-|
/-3-x-3-x-3-x-3-x-7-x-5-x-5-x-5-x-5-x-7-x-7-x-7-x-7-|
/-4-x-4-x-4-x-4-x-8-x-6-x-6-x-6-x-6-x-8-x-8-x-8-x-8-|
/-6-x-6-x-6-x-6-x-9-x-7-x-7-x-7-x-7-x-9-x-9-x-9-x-9-|
/---------------------------------------------------|
/---------------------------------------------------|

in the last part where the 7 chord starts the strumming pattern is D,D,U,D
                           7
                           8
                           9


Index:
D= down strumming
U= up strumming

and thats how the song goes, it repeats itself with this pattern.