/srv/irclogs.ubuntu.com/2007/06/23/#ubuntu-kernel.txt

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MrRTOSwhat the command "make oldconfig" is for? or what does it do?11:39
Mithrandirit only asks you about any new options11:40
johanbrIt starts the kernel build with a previous .config file, only asking you about config options that aren't already in the old .config.11:40
MrRTOScool but where are these configurations that are not part of .config? where do they come from and how does "make" know that there are more configurations that are not especified by .config?11:44
johanbrThe config options are part of the kernel build system. A typical use for oldconfig is when you an old .config file from a previous kernel, with fewer options.11:45
johanbr"when you have..."11:45
MrRTOSI'm still confused11:46
MrRTOSlol11:46
MrRTOSyou have a new .config that make oldconfig will use11:47
MrRTOSbut you say that there is an old .config file too11:47
MrRTOShow can there be two files with the same name?11:47
johanbrThere aren't two .config files. "make oldconfig" populates the old .config file with the values you select for the new options.11:49
MrRTOSI'm probably having problems understanding because I do not understand the basics of the build system11:51
MrRTOSif there is no .config file (if I delete it) and type make menuconfig and choose a bunch of stuff then save it and exit it11:53
MrRTOSwhat are the results of this operation?11:53
johanbrIt produces a .config file with whichever values you selected.11:54
MrRTOSwill menuconfig create a .config file for me and when I type "make zImage" make will use the .config file created to configure everything?11:54
johanbryes11:54
MrRTOSok11:54
MrRTOSso it's starting from scratch11:54
MrRTOSbut you say11:54
MrRTOSthat if I already have a .config11:55
MrRTOSI could do make oldconfig and it will use the existing .config as a template?11:55
johanbryes11:55
MrRTOSmeaning use the answers provided by .config to create the new .config11:55
johanbryes11:55
MrRTOSok so my old .config file ends up overwritten by the make oldconfig process11:56
MrRTOScause there might be some other options11:56
johanbrNot really, all the old options you selected are still there. The difference is that it will also contain the values you just selected for the new options.11:56
MrRTOSok I get it now11:56
MrRTOSthere is still one question un-answered though11:57
MrRTOSthose extra configurations that make oldconfig add11:57
MrRTOSmay add I should say11:57
MrRTOSwhere do they come from?11:57
MrRTOSif I have an old .config and I type "make oldconfig" it will use the old .config and add whatever new configurations I choose if there is any available11:58
johanbrThe new options come from somewhere in the kernel build system, I don't remember the details.11:59
MrRTOSoh ok11:59
johanbrBasically each kernel source tree "knows" which options go with it.11:59
MrRTOSenglish is my second language so sorry for not explaining things clearly11:59
johanbrYour English is fine. It's not my native language either. :)12:00
MrRTOS:)12:01
MrRTOSthx12:01
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MrRTOSI guess I should learn the kernel build system12:06
MrRTOSany good books that could teach it to me?12:06
johanbrDon't really know, haven't read any of the kernel books. A good start would be to look in the Documentation directory of the kernel source tree.12:10
MrRTOSk I'll do that12:11
MrRTOSI'll check at amazon too 12:11
MrRTOSthanks for your help12:11
MrRTOSfinally I understand the make oldconfig stuff12:11
johanbrNo problem. :)12:13
JanCdoes anyone know if motherboards with the new P35 Core 2 Duo chipset are supported in feisty or gutsy ?12:13

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