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From: Kelsey Bjarnason <kbjarnason@gmail.com>
Newsgroups: comp.os.linux.advocacy,comp.os.linux.embedded
Subject: Re: Reading the Riot Act To ARM's developers
Date: Sat, 11 Feb 2012 10:34:30 -0800
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[snips]

On Sat, 11 Feb 2012 09:58:06 +0000, 7 wrote:

> #define INT_XMA (1 << 4)
> #define ENABLE_RS232  SYSCON->INT |= INT_XMA
> 
> 
> The problem I am having is what does that '4' mean. Is it 4 or 14 or
> something else? I need a datasheet. Thats just crap programming.


No, you need to learn the concept of commenting your code:

; 4th LSB is XMA interrupt enable/disable on MS4 series processors
#define INT_XMA (1<<4) 

Now you know exactly what the 4 is, where it came from, why it's there 
and what it does.