1 00:00:00,005 --> 00:00:01,004 - [Instructor] We do a lot with the 2 00:00:01,004 --> 00:00:05,003 kernel source code using Make. 3 00:00:05,003 --> 00:00:08,005 So the kernel Makefile is an important 4 00:00:08,005 --> 00:00:13,005 file to use and know something about. 5 00:00:13,005 --> 00:00:16,007 So one thing you can do is do make help 6 00:00:16,007 --> 00:00:18,006 and that will give you quite a bit 7 00:00:18,006 --> 00:00:21,005 of information about the sort of things you can make. 8 00:00:21,005 --> 00:00:25,003 You can make menuconfig or make xconfig, 9 00:00:25,003 --> 00:00:28,001 and later on we'll configure a kernel, 10 00:00:28,001 --> 00:00:31,006 but in the top-level kernel directory, 11 00:00:31,006 --> 00:00:35,002 if you do a config, you'll get a file called .config 12 00:00:35,002 --> 00:00:36,002 and that's a text file. 13 00:00:36,002 --> 00:00:37,009 You can read it, you can grip it and all that. 14 00:00:37,009 --> 00:00:40,009 And that's all the configuration choices. 15 00:00:40,009 --> 00:00:42,002 That's a really nice thing. 16 00:00:42,002 --> 00:00:44,008 You can make a copy of that. 17 00:00:44,008 --> 00:00:47,000 You can give that to other people. 18 00:00:47,000 --> 00:00:50,001 There may even be a copy for your kernel 19 00:00:50,001 --> 00:00:51,002 in your boot directory 20 00:00:51,002 --> 00:00:54,005 with a name like config dash kernel version, 21 00:00:54,005 --> 00:00:59,001 so you can figure out how your kernel was configured. 22 00:00:59,001 --> 00:01:03,005 Also, other things you can make are things like bzImage, 23 00:01:03,005 --> 00:01:08,002 modules, modules_install, install, clean. 24 00:01:08,002 --> 00:01:11,000 So some of these compile things, some of these copy things, 25 00:01:11,000 --> 00:01:13,008 some of these delete things. 26 00:01:13,008 --> 00:01:17,007 Right? There's a lot you could do with a kernel Makefile. 27 00:01:17,007 --> 00:01:21,003 Also, in the Makefile should be variable set 28 00:01:21,003 --> 00:01:22,005 like version information. 29 00:01:22,005 --> 00:01:24,008 So at the very top of it you should see things like 30 00:01:24,008 --> 00:01:27,002 the version and the patchlevel set 31 00:01:27,002 --> 00:01:31,002 and the cool name that they've given that version. 32 00:01:31,002 --> 00:01:33,001 I like make help. 33 00:01:33,001 --> 00:01:35,006 So, I think you ought to do it. 34 00:01:35,006 --> 00:01:38,009 You'll see stuff you can use for cleaning 35 00:01:38,009 --> 00:01:41,006 and tell you the difference between clean, and mrproper, 36 00:01:41,006 --> 00:01:44,009 and distclean, for example. 37 00:01:44,009 --> 00:01:48,003 And ways you can configure the kernel. 38 00:01:48,003 --> 00:01:51,004 Kind of the classic interface for configuring the kernel 39 00:01:51,004 --> 00:01:53,009 is make menuconfig, 40 00:01:53,009 --> 00:01:56,006 but there's other choices there. 41 00:01:56,006 --> 00:01:58,005 And then, building stuff. 42 00:01:58,005 --> 00:02:00,001 If you say build all, 43 00:02:00,001 --> 00:02:03,000 it'll build everything that's marked with an asterisk. 44 00:02:03,000 --> 00:02:05,004 For example, vmlinux. 45 00:02:05,004 --> 00:02:09,000 So that's a uncompressed object file. 46 00:02:09,000 --> 00:02:11,005 That's the kernel. 47 00:02:11,005 --> 00:02:16,002 BzImage is that vmlinux compressed 48 00:02:16,002 --> 00:02:19,008 and put some extra information in it. 49 00:02:19,008 --> 00:02:24,006 Make modules, builds all the loadable kernel modules 50 00:02:24,006 --> 00:02:26,009 that were configured. 51 00:02:26,009 --> 00:02:30,006 That's actually probably quite a bit to do. 52 00:02:30,006 --> 00:02:33,007 Module install will install those modules 53 00:02:33,007 --> 00:02:37,004 into the standard place on your system 54 00:02:37,004 --> 00:02:40,001 or you can tell it where to install them 55 00:02:40,001 --> 00:02:43,002 if you want to give it another path. 56 00:02:43,002 --> 00:02:46,008 Install, installs the kernel. 57 00:02:46,008 --> 00:02:48,009 So if you're building for your system 58 00:02:48,009 --> 00:02:50,000 do a module install, 59 00:02:50,000 --> 00:02:51,008 or install might be handy. 60 00:02:51,008 --> 00:02:53,008 When you're just building, 61 00:02:53,008 --> 00:02:58,004 doing a make all is probably what you want to do. 62 00:02:58,004 --> 00:03:01,000 All right, we'll be doing some of that later.