For some reason this didn't go through yesterday so, once again......


-------- Forwarded Message --------
Subject: Creating a custom kernel from a -bin kernel
Date: Sat, 5 Oct 2024 18:55:50 +0800
From: Andrew Lowe <agl@wht.com.au>
Reply-To: agl@wht.com.au
Organization: Wombat High Tech
To: gentoo-user@lists.gentoo.org

Dear all,
I'm in the process of building a new machine. To get things up and running I've decided to go with the gentoo-sources-bin kernel initially,
then once I get things basically working as I want I will go back to
building my kernels manually.

I've now reached that point, "hand rolling" the kernel, but it is a pain, the first time round, getting things right.

I have a recollection of reading somewhere online mention of a script that will take the .config file from the "-bin" kernel and then
modprobe, I think, each listed module in turn to see if it is actually
being used and subsequently writing a new .config file that now only
contains the modules/options that the specific machine needs.

Is this a mythical script that I have dreamt up after a long day and too much chocolate or does it actually exist and does anyone have a link.

Thanks for any thoughts,

Andrew

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Hi Andrew,

On Sunday 6 October 2024 15:16:46 BST Andrew Lowe wrote:

For some reason this didn't go through yesterday so, once again......

-------- Forwarded Message --------
Subject: Creating a custom kernel from a -bin kernel
Date: Sat, 5 Oct 2024 18:55:50 +0800
From: Andrew Lowe <agl@wht.com.au>
Reply-To: agl@wht.com.au
Organization: Wombat High Tech
To: gentoo-user@lists.gentoo.org

Dear all,
I'm in the process of building a new machine. To get things up and running I've decided to go with the gentoo-sources-bin kernel initially,
then once I get things basically working as I want I will go back to
building my kernels manually.

I've now reached that point, "hand rolling" the kernel, but it is a pain, the first time round, getting things right.

I have a recollection of reading somewhere online mention of a

script

that will take the .config file from the "-bin" kernel and then
modprobe, I think, each listed module in turn to see if it is actually
being used and subsequently writing a new .config file that now only
contains the modules/options that the specific machine needs.

Is this a mythical script that I have dreamt up after a long day and too much chocolate or does it actually exist and does anyone have a link.

Thanks for any thoughts,

Andrew

Have a look at this page:

https://wiki.gentoo.org/wiki/Kernel/Configuration

In particular, take notice of 'make localmodconfig'.

Once you have a customised kernel as you like it and it boots successfully,
you can copy your good /usr/src/linux/.config to any subsequently emerged new gentoo-source kernel trees and run 'make oldconfig' thereafter, to only have
to deal with new kernel options.

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On 10/9/24 6:08 PM, Michael wrote:

I have a recollection of reading somewhere online mention of a

script

that will take the .config file from the "-bin" kernel and then
modprobe, I think, each listed module in turn to see if it is actually
being used and subsequently writing a new .config file that now only
contains the modules/options that the specific machine needs.

Is this a mythical script that I have dreamt up after a long day and
too much chocolate or does it actually exist and does anyone have a link.

Thanks for any thoughts,

Andrew

Have a look at this page:

https://wiki.gentoo.org/wiki/Kernel/Configuration

In particular, take notice of 'make localmodconfig'.

Once you have a customised kernel as you like it and it boots successfully, you can copy your good /usr/src/linux/.config to any subsequently emerged new
gentoo-source kernel trees and run 'make oldconfig' thereafter, to only have to deal with new kernel options.

See also https://wiki.gentoo.org/wiki/Modprobed-db

"make localmodconfig" will only handle what your current system state is
using right at that second -- modprobed-db maintains a database over
time of the modules that "make localmodconfig" would see, which means
you can run the -bin kernel for a bit under your usual workloads and
then activate "make localmodconfig" via that database without worrying
about "an important module I often use was not loaded today specifically because I didn't run the program which needs it today. Now the newly
built kernel doesn't have that module at all, oops".


--
Eli Schwartz

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