create scope data for Linux Kernel or u-boot

Follow the usual instructions on how to build Linux kernel or u-boot until the step which does the real make, at this stage you could create scope data by typing:

make cscope

This will create scope.out, which could be used in vim:

cs add scope.out

Then you could use the command defined in the following section to search the database and jump around.

cscope setup

This is generic for all cscope for any projects other than Linux Kernel or u-boot.

I likes to use cabbrev command:

Add following lines into your .vimrc

cabbrev fs :cs find s <cword>
cabbrev fg :cs find g <cword>
cabbrev fd :cs find d <cword>
cabbrev fc :cs find c <cword>
cabbrev ft :cs find t <cword>
cabbrev fe :cs find e <cword>
cabbrev ff :cs find f <cword>
cabbrev fi :cs find i <cword>

The meaning for each command is as follows (copied from vim helper):

0 or s: Find this C symbol
1 or g: Find this definition
2 or d: Find functions called by this function
3 or c: Find functions calling this function
4 or t: Find this text string
6 or e: Find this egrep pattern
7 or f: Find this file
8 or i: Find files #including this file
9 or a: Find places where this symbol is assigned a value

If you do not want to do such mapping by default, you may save to an text file say ~/cscopecmd.txt, then each time you want to use these command, you may so ~/cscopecmd.txt to set up.

After setting up, when you type :fs followed by space, the command will be expanded to :cs find s <cword>, you could then press or edit the command line as you want.

other type of database

In u-boot, other type of database like ctags or etags could be generated.

Generate ctags database:

make tags

Or

make ctags

Generate etags database:

make etags

In linux kernel source code, following target are available in Makefile:

tags TAGS cscope gtags