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Old 02-08-2015, 01:23 PM   #1
ironQiu
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Registered: Feb 2015
Location: UK
Distribution: Slackware, openSUSE, centOS
Posts: 3

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Can't find /boot/efi/EFI/Slackware/vmlinuz kernel configuration


I installed Slackware 14.1 64-bit on a new machine and I found I have three kernels

Two under /boot

Code:
-rw-r--r--  1 root root 3450176 Feb 14  2014 vmlinuz-generic-3.10.17
-rw-r--r--  1 root root 6436992 Feb 14  2014 vmlinuz-huge-3.10.17
with their configuration files
Code:
-rw-r--r--  1 root root  137813 Feb 14  2014 config-generic-3.10.17
-rw-r--r--  1 root root  137813 Feb 14  2014 config-huge-3.10.17
and one under /boot/efi/EFI/Slackware/

Code:
-rwxr-xr-x 1 root root 6441264 Oct 23  2013 vmlinuz
But for this latter one there is no configuration file. Any idea on where I can find it?

Thanks
 
Old 02-08-2015, 01:48 PM   #2
Didier Spaier
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Registered: Nov 2008
Location: Paris, France
Distribution: Slint64-14.2.1.2 on Lenovo Thinkpad W520
Posts: 9,012

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The kernel /boot/efi/EFI/Slackware/vmlinuz was copied from /boot/vmlinuz at time of installation to allow registering it in a UEFI boot menu entry.

So it's really the same kernel as the target of the symlink /boot/vmlinuz (still at time of installation).

So if for instance /boot/vmlinuz was a symlink to /boot/vmlinuz-huge-3.10.17 the config file is config-huge-3.10.17-smp.

To know more you could have a look at /usr/sbin/eliloconfig that does that.

PS I almost forgot: welcome to this Slackware forum!

Last edited by Didier Spaier; 02-08-2015 at 01:49 PM. Reason: PS added.
 
Old 02-08-2015, 04:05 PM   #3
ironQiu
LQ Newbie
 
Registered: Feb 2015
Location: UK
Distribution: Slackware, openSUSE, centOS
Posts: 3

Original Poster
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Thanks for the prompt answer and the Welcome.

I had a look at eliloconfig but I didn't find what I was looking for. So I try to detail my question.

I'm using a PC with elilo and UEFI, so the system is booting from /boot/efi/EFI/Slackware/vmlinuz (which is not a link)

Yes, my /boot/vmlinuz is indeed a link to

Code:
lrwxrwxrwx 1 root root 20 Jan 11 17:37 /boot/vmlinuz -> vmlinuz-huge-3.10.17
whose size is 6436992

On the other end /boot/efi/EFI/Slackware/vmlinuz is an image and its size is 6441264: My original question was to find out what's the difference with the kernel-huge

The test I did was to

- take the Slackware kernel source code for 3.10.17,
- take the config-huge-3.10.17 and copied as .config
- enable the kernel options for UEFI via make manuconfig
- rebuild the kernel

hoping to get the same vmlinuz as the /boot/efi/EFI/Slackware/vmlinuz. I might have done it wrong, but I didn't get exactly the same kernel. It's working fine but the original one is performing slightly better than mine. That's why I'm looking for the config file that has been used to create /boot/efi/EFI/Slackware/vmlinuz just to make sure I didn't miss anything in the kernel configuration.

Basically I just set CONFIG_RELOCATABLE=y and CONFIG_EFIVAR_FS=y. All the other UEFI options were already set.
So it looks like, and you might confirm, that the huge and general kernel configuration are not the ones used to generate the image in /boot/efi/EFI/Slackware

If I grep the macro

Code:
config-generic-3.10.17:457:# CONFIG_RELOCATABLE is not set
config-huge-3.10.17:457:# CONFIG_RELOCATABLE is not set

config-generic-3.10.17:5700:CONFIG_EFIVAR_FS=m
config-huge-3.10.17:5700:CONFIG_EFIVAR_FS=m
But if I miss something in the configuration and indeed the config-huge-3.10.17 has been used for /boot/efi/EFI/Slackware/vmlinuz, why its size differs from vmlinuz-huge-3.10.17?
Simply built with different options or version of gcc?

Sorry for the long mail but I'm trying to understand.

Thanks in advance for your reply.
 
Old 02-09-2015, 03:37 AM   #4
ml4711
Member
 
Registered: Aug 2012
Location: Ryomgård, Danmark
Distribution: Slackware64
Posts: 146

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To get a readable copy of the configuration for the running kernel

Code:
zcat /proc/config.gz > config.txt
Cheers
 
1 members found this post helpful.
Old 02-09-2015, 06:21 AM   #5
ironQiu
LQ Newbie
 
Registered: Feb 2015
Location: UK
Distribution: Slackware, openSUSE, centOS
Posts: 3

Original Poster
Rep: Reputation: Disabled
Thanks! Exactly what I need.
 
  


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