**** BEGIN LOGGING AT Thu Mar 02 03:00:03 2017 Mar 02 13:01:36 Hello! Mar 02 13:02:35 I want to build my own kernel onto the BBB and I'm following the instructions given at http://ardupilot.org/dev/docs/building-for-beaglebone-black-on-linux.html Mar 02 13:03:25 and ? Mar 02 13:04:17 Here (http://ardupilot.org/dev/docs/building-for-beaglebone-black-on-linux.html#installing-the-rt-kernel) they say that one should backup their zimage and uinitrd. Mar 02 13:04:55 I can't find both these files in /boot/uboot on my BBB Mar 02 13:05:07 Is there something that I have missed. Mar 02 13:13:11 isnt it the file there in /boot/ ? Mar 02 13:13:27 the vmlinuz file ? Mar 02 13:13:59 check if uname -r is same as the vmlinuz file there in /boot/ Mar 02 13:14:10 vmlinuz is just the later format. Mar 02 13:14:41 and I think you can 'make' vmlinuz by compiling the kernel Mar 02 13:15:17 I have vmlinuz-3.8.13-bone79 in /boot Mar 02 13:15:32 uname -r shows the same version. Mar 02 13:15:58 I think thats the kernel image file. Mar 02 13:16:15 Are you saying vmlinuz is newer form of zImage (and/or uinitrd)? Mar 02 13:16:40 So should I back vmlinuz up? Mar 02 13:17:29 I have initrd.img-3.8.13-bone79 in /boot/ Mar 02 13:17:42 actually, I think there must be an obtion to change the image being used to boot in the bootloader config file. though I am not sure. Mar 02 13:17:43 is this the newer form of uinitrd? Mar 02 13:17:46 and if it is .. Mar 02 13:17:57 you can just choose the file directly Mar 02 13:18:16 tokencolour: http://unix.stackexchange.com/questions/5518/what-is-the-difference-between-the-following-kernel-makefile-terms-vmlinux-vml Mar 02 13:21:21 Thanks for the link. It is a nice answer. Mar 02 13:22:10 So I should just back these up Mar 02 13:22:20 and continue. Mar 02 13:22:31 looks like yeah .. Mar 02 13:23:08 zeekhuge: Thanks for the help. Mar 02 13:55:22 During booting, does U-Boot pass a DT blob to the kernel or A tags? Mar 02 13:59:47 carpediem_: what are "A tags"? Mar 02 13:59:59 carpediem_: I think the answer is a DT blob Mar 02 14:01:04 I was reading up some detailed stuff on bootloaders Mar 02 14:01:38 It said that sometimes bootloaders pass A tags to ARM based designs Mar 02 14:01:57 It was used to convey some information from the bootloader to the kernel Mar 02 14:02:19 Anyways. Thanks! Mar 02 14:02:22 we end up doing a load of the .dtb into memory and then use it as an argument to 'zimage' Mar 02 14:02:58 zimage represents the kernel here, right? Mar 02 14:03:13 I know there has been discussion about some platforms that lump it into the kernel, but 'zimage' must present it to the kernel somehow. Mar 02 14:03:18 er, zboot Mar 02 14:03:53 Got it. Mar 02 14:06:37 Wait, what is zboot? Mar 02 14:19:43 maybe it was supposed to be bootz? as in u-boot command for booting zimage Mar 02 16:01:57 php7: Thanks for information about 4 layers pcb. I saw it :) Mar 02 16:40:34 pdp7: ^^ **** ENDING LOGGING AT Fri Mar 03 03:00:00 2017