1 00:00:00,007 --> 00:00:03,005 - [Instructor] I'm in a GUI environment here 2 00:00:03,005 --> 00:00:05,002 and let's look at some stuff. 3 00:00:05,002 --> 00:00:11,005 Let's start with doing a make xconfig. 4 00:00:11,005 --> 00:00:15,001 And I'm in the Ubuntu kernel source here. 5 00:00:15,001 --> 00:00:19,003 So we see the big menu of stuff there. 6 00:00:19,003 --> 00:00:23,004 Let's look for something, let's do a edit find. 7 00:00:23,004 --> 00:00:26,007 Let's look for our ethernet driver. 8 00:00:26,007 --> 00:00:33,009 So that was mlx5_core. 9 00:00:33,009 --> 00:00:35,009 And I hit enter 10 00:00:35,009 --> 00:00:41,003 and it shows me that little cryptic list there. 11 00:00:41,003 --> 00:00:46,008 And then let's go up to option, show name, 12 00:00:46,008 --> 00:00:50,003 and that shows the names here. 13 00:00:50,003 --> 00:00:54,001 And when I click on one here, 14 00:00:54,001 --> 00:00:58,007 then it brings it up 15 00:00:58,007 --> 00:01:02,007 and we've got the help, and we've got it 16 00:01:02,007 --> 00:01:05,008 and we can select right there. 17 00:01:05,008 --> 00:01:10,009 And I did a dot. And that turns it into a module. 18 00:01:10,009 --> 00:01:12,008 Let's turn it off. 19 00:01:12,008 --> 00:01:18,008 So we're not going to have that driver selected at all. 20 00:01:18,008 --> 00:01:21,009 So let's just do that. We'll save that out. 21 00:01:21,009 --> 00:01:23,009 If you look at the little window back there, 22 00:01:23,009 --> 00:01:29,007 it says it wrote to .config, a couple other little errors 23 00:01:29,007 --> 00:01:33,007 that we're going to ignore, and then we're going to quit. 24 00:01:33,007 --> 00:01:38,000 And now it looks like we changed the Mellanox 25 00:01:38,000 --> 00:01:40,007 to not be selected. 26 00:01:40,007 --> 00:01:45,004 Let's grep that 27 00:01:45,004 --> 00:01:48,003 in our .config. 28 00:01:48,003 --> 00:01:54,000 And what happens is it adds a comment saying it's not set. 29 00:01:54,000 --> 00:01:57,006 If it was a module, as we saw before with modules, 30 00:01:57,006 --> 00:01:58,007 it would be in there 31 00:01:58,007 --> 00:02:03,007 and would say equals M, right? 32 00:02:03,007 --> 00:02:12,000 So let's try a make menuconfig now. 33 00:02:12,000 --> 00:02:13,008 Let me get this interface. 34 00:02:13,008 --> 00:02:23,008 Let's look for the Mellanox in here. 35 00:02:23,008 --> 00:02:28,004 And it tells us where it is, but doesn't bring us to it. 36 00:02:28,004 --> 00:02:30,008 So it's underneath the device drivers, 37 00:02:30,008 --> 00:02:32,005 network device support, 38 00:02:32,005 --> 00:02:36,005 ethernet driver support, Mellanox devices. 39 00:02:36,005 --> 00:02:38,006 And then it's the Mellanox 5th generation 40 00:02:38,006 --> 00:02:41,003 network adapters. 41 00:02:41,003 --> 00:02:46,003 And the name up here is MLX5_CORE. 42 00:02:46,003 --> 00:02:47,005 And this is tristate. 43 00:02:47,005 --> 00:02:51,007 So it could be a module, static, or not at all. 44 00:02:51,007 --> 00:02:53,007 Now whether it could be static 45 00:02:53,007 --> 00:02:55,008 or not can depend on configuration 46 00:02:55,008 --> 00:03:00,006 because if something it depends on is a module, 47 00:03:00,006 --> 00:03:02,000 then it has to be a module. 48 00:03:02,000 --> 00:03:04,001 'Cause you can't statically link in something 49 00:03:04,001 --> 00:03:05,009 that doesn't have everything it needs 50 00:03:05,009 --> 00:03:08,004 already statically linked. 51 00:03:08,004 --> 00:03:10,002 So let's see if we can find it, 52 00:03:10,002 --> 00:03:12,001 if we can remember where that was. 53 00:03:12,001 --> 00:03:15,006 It was device drivers 54 00:03:15,006 --> 00:03:20,008 and then network. 55 00:03:20,008 --> 00:03:25,007 And then ethernet. 56 00:03:25,007 --> 00:03:28,001 See that star there saying we have general ethernet 57 00:03:28,001 --> 00:03:34,003 driver support in, and then we got to look for Mellanox. 58 00:03:34,003 --> 00:03:37,005 See how xconfig's so much easier? 59 00:03:37,005 --> 00:03:38,007 Looks like they're alphabetical, 60 00:03:38,007 --> 00:03:42,004 but it's the order they are in the Kconfig file. 61 00:03:42,004 --> 00:03:46,001 There we go. And what do we have there? 62 00:03:46,001 --> 00:03:51,000 So the Mellanox devices are underneath here. 63 00:03:51,000 --> 00:03:52,007 Oh, there it is. Right there. 64 00:03:52,007 --> 00:03:55,006 And it's off because with xconfig we turned it off. 65 00:03:55,006 --> 00:03:59,007 So I'm going to hit the space bar and now it's a module 66 00:03:59,007 --> 00:04:03,008 and some new options popped up of things we can add to that. 67 00:04:03,008 --> 00:04:05,009 But we'll just leave it at that. 68 00:04:05,009 --> 00:04:10,005 I exit out, I arrow over to exit, exit again, 69 00:04:10,005 --> 00:04:13,008 arrow over to exit, exit. 70 00:04:13,008 --> 00:04:14,007 And then it says, 71 00:04:14,007 --> 00:04:17,008 "Do you wish to save your new configuration?" 72 00:04:17,008 --> 00:04:20,004 And I'm going to hit enter for yes. 73 00:04:20,004 --> 00:04:24,003 And it writes to the .config. 74 00:04:24,003 --> 00:04:27,009 And if we grep in the .config for the MLX5_CORE, 75 00:04:27,009 --> 00:04:32,001 we see now it's set to an M. 76 00:04:32,001 --> 00:04:33,009 All right, couple other quick things. 77 00:04:33,009 --> 00:04:39,005 Let's go to a different kernel. 78 00:04:39,005 --> 00:04:42,000 Let's look at some defconfigs. 79 00:04:42,000 --> 00:04:47,009 So if I ls arch/arm/configs, 80 00:04:47,009 --> 00:04:50,006 I see a whole lot of defconfigs. 81 00:04:50,006 --> 00:04:54,009 So I could do something like make ARCH=arm 82 00:04:54,009 --> 00:04:56,004 and pick one of these. 83 00:04:56,004 --> 00:04:58,001 What's a nice easy one to type? 84 00:04:58,001 --> 00:05:01,008 hisi_defconfig. 85 00:05:01,008 --> 00:05:04,009 Let's see if that works. 86 00:05:04,009 --> 00:05:12,006 Yep, it saved all that out to .config. 87 00:05:12,006 --> 00:05:18,003 Let's go back to our Ubuntu kernel and, 88 00:05:18,003 --> 00:05:21,001 we would build a kernel image with that. 89 00:05:21,001 --> 00:05:23,006 We could do a J. 90 00:05:23,006 --> 00:05:27,009 I've already built it so it shouldn't take very long. 91 00:05:27,009 --> 00:05:30,001 And it tells you where it put it. 92 00:05:30,001 --> 00:05:37,000 If we do a long list on that, 93 00:05:37,000 --> 00:05:39,002 we see it, for example. 94 00:05:39,002 --> 00:05:43,000 All right, that was a little bit of practice.