[Ltsp-discuss] custom kernel 4.2

Discussion:

Jens Korth

2006-10-19 14:05:44 UTC

Hello,

I am trying to compile my own kernel for ltsp 4.2.

I
- installed the 2.6.17.8 kernel sources
- installed the kernel kit
- copied the 2.6.17.8 .config file from the kit to the kernel directory
- run make oldconfig (but didn't change anything for the beginning)
- changed "Extraversion" in the makefile
- run "make, make modules, make modules_install"
- run build_initramfs

All that seems to run without problems. I get a new kernel with the pxe
files etc. in the tftboot/lts directory, modules are installed into
/opt/ltsp-4.2/i386/lib/modules/kernelname

I then changed the dhcpd config to point to the new kernel.

The kernel boots from pxe without any problem, but stops at the end with
an error
"Failed to execute /init"
"Kernel panic - not syncing: No init found. Try passing init= option to
kernel."

Any ideas what I missed?

Thank you very much for your help.

jens

Jim McQuillan

2006-10-19 15:56:03 UTC

Permalink

Post by Jens Korth
Hello,
I am trying to compile my own kernel for ltsp 4.2.
I
- installed the 2.6.17.8 kernel sources
- installed the kernel kit
- copied the 2.6.17.8 .config file from the kit to the kernel directory
- run make oldconfig (but didn't change anything for the beginning)
- changed "Extraversion" in the makefile
- run "make, make modules, make modules_install"
- run build_initramfs
All that seems to run without problems. I get a new kernel with the pxe
files etc. in the tftboot/lts directory, modules are installed into
/opt/ltsp-4.2/i386/lib/modules/kernelname
I then changed the dhcpd config to point to the new kernel.
The kernel boots from pxe without any problem, but stops at the end with
an error
"Failed to execute /init"
"Kernel panic - not syncing: No init found. Try passing init= option to
kernel."

Can you show us the pxelinux.cfg/default file that you are using? Also, a
listing of the directory where your kernel and initrd file reside might
help too:

ls -lR /tftpboot/lts

would be helpful.

Jim McQuillan

Post by Jens Korth
Any ideas what I missed?
Thank you very much for your help.
jens
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Jens Korth

2006-10-19 16:22:27 UTC

Permalink

Dear Jim,

thank you for offering your help. Here is the information.

-------------
pxelinux.cfg/default: (I don't belive that the problem is here. If I
take the ltsp pre-compiled kernel, the same file works fine...):

prompt 0
label linux
kernel bzImage-2.6.17.8-ltsp-shuttle
append rw root=/dev/ram0 initrd=initramfs.gz NIC=tg3
--------

Directory listing of the tftpboot directory which is used by dhcpd:

/tftpboot/lts/2.6.17.8-ltsp-shuttle/:
insgesamt 4348
-rw-r--r-- 1 root root 1689510 19. Oct 00:30 bzImage-2.6.17.8-ltsp-shuttle
-rw-r--r-- 1 root root 2734887 19. Oct 00:30 initramfs.gz
-rw-r--r-- 1 root root 11826 19. Oct 00:30 pxelinux.0
drwxr-xr-x 2 root root 4096 19. Oct 00:30 pxelinux.cfg

/tftpboot/lts/2.6.17.8-ltsp-shuttle/pxelinux.cfg:
insgesamt 4
-rw-r--r-- 1 root root 115 19. Oct 00:33 default

-----------------------------

All that seems ok to me ?! Maybe the initramfs.gz is not built correctly
by the script?!

Thank you
Jens

Post by Jim McQuillan

Can you show us the pxelinux.cfg/default file that you are using? Also, a
listing of the directory where your kernel and initrd file reside might
ls -lR /tftpboot/lts
would be helpful.
Jim McQuillan

-------------------------------------------------------------------------
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_____________________________________________________________________
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--------------------------------
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Jim McQuillan

2006-10-19 16:46:12 UTC

Permalink

Post by Jens Korth
Dear Jim,
thank you for offering your help. Here is the information.
-------------
pxelinux.cfg/default: (I don't belive that the problem is here. If I
prompt 0
label linux
kernel bzImage-2.6.17.8-ltsp-shuttle
append rw root=/dev/ram0 initrd=initramfs.gz NIC=tg3
--------
insgesamt 4348
-rw-r--r-- 1 root root 1689510 19. Oct 00:30 bzImage-2.6.17.8-ltsp-shuttle
-rw-r--r-- 1 root root 2734887 19. Oct 00:30 initramfs.gz
-rw-r--r-- 1 root root 11826 19. Oct 00:30 pxelinux.0
drwxr-xr-x 2 root root 4096 19. Oct 00:30 pxelinux.cfg
insgesamt 4
-rw-r--r-- 1 root root 115 19. Oct 00:33 default
-----------------------------
All that seems ok to me ?! Maybe the initramfs.gz is not built correctly
by the script?!

well, I suppose it's possible. Lets take a look at the initramfs.gz

It's a gzipped cpio file.

So, try this:

cd /tftpboot/2.6.17.8-ltsp-shuttle
mkdir initramfs
cd initramfs
gunzip <../initramfs.gz | cpio -ivmud

This should result in the contents of the initramfs.gz file being dumped
into the initramfs directory. You should have a file called 'init'. If
you do, then maybe something's goofy with your kernel. But, didn't you
say you didn't change anything in the config?

btw, why do you even want to build a custom kernel?

Jim McQuillan

Post by Jens Korth
Thank you
Jens

Post by Jim McQuillan

Can you show us the pxelinux.cfg/default file that you are using? Also, a
listing of the directory where your kernel and initrd file reside might
ls -lR /tftpboot/lts
would be helpful.
Jim McQuillan

Post by Jens Korth
Any ideas what I missed?
Thank you very much for your help.
jens
-------------------------------------------------------------------------
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Get stuff done quickly with pre-integrated technology to make your job easier
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_____________________________________________________________________
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For additional LTSP help, try #ltsp channel on irc.freenode.net

--
Best regards / Mit freundlichen Grüßen / Cordialement
Jens Korth, Managing Director
--------------------------------
www.airport-information.com
Albatross World Airports and Suppliers Database
Protect the privacy of your messages!
Email us your public PGP key and
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Jens Korth

2006-10-19 17:11:45 UTC

Permalink

Dear Jim,

I want a custom kernel because I need some other drivers for
sound/graphics etc. And I hoped for some better performance when
compiling for the specific processor (Pentium M).

Anyway:

I unpacked the initramfs.gz file.
The IS an init file in the root directory.
Very strange.

Maybe the .config file for the kernel is not correct.
Is there anything that could prevent the kernel from using the
initramfs.gz file?

I noticed that there is an entry "initramfs file" in the kernel options,
but that is not what we need, isn't it?

Any other idea?

Jens

Post by Jim McQuillan

well, I suppose it's possible. Lets take a look at the initramfs.gz
It's a gzipped cpio file.
cd /tftpboot/2.6.17.8-ltsp-shuttle
mkdir initramfs
cd initramfs
gunzip <../initramfs.gz | cpio -ivmud
This should result in the contents of the initramfs.gz file being dumped
into the initramfs directory. You should have a file called 'init'. If
you do, then maybe something's goofy with your kernel. But, didn't you
say you didn't change anything in the config?
btw, why do you even want to build a custom kernel?
Jim McQuillan

Post by Jens Korth
Thank you
Jens

Post by Jim McQuillan

Can you show us the pxelinux.cfg/default file that you are using? Also, a
listing of the directory where your kernel and initrd file reside might
ls -lR /tftpboot/lts
would be helpful.
Jim McQuillan

Post by Jens Korth
Any ideas what I missed?
Thank you very much for your help.
jens
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_____________________________________________________________________
https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
For additional LTSP help, try #ltsp channel on irc.freenode.net

--
Best regards / Mit freundlichen Grüßen / Cordialement
Jens Korth, Managing Director
--------------------------------
www.airport-information.com
Albatross World Airports and Suppliers Database
Protect the privacy of your messages!
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-------------------------------------------------------------------------
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Get stuff done quickly with pre-integrated technology to make your job easier
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_____________________________________________________________________
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For additional LTSP help, try #ltsp channel on irc.freenode.net

Jim McQuillan

2006-10-19 17:43:05 UTC

Permalink

Post by Jens Korth
Dear Jim,
I want a custom kernel because I need some other drivers for
sound/graphics etc. And I hoped for some better performance when
compiling for the specific processor (Pentium M).
I unpacked the initramfs.gz file.
The IS an init file in the root directory.
Very strange.
Maybe the .config file for the kernel is not correct.
Is there anything that could prevent the kernel from using the
initramfs.gz file?
I noticed that there is an entry "initramfs file" in the kernel options,
but that is not what we need, isn't it?

No, that's an alternate way of providing an initramfs file. PXE handles
this for us.

Can you watch the screen, and see if the initramfs.gz is actually being
downloaded? It may happen pretty quickly, so you might not see it.

You could also view the system logs to see if you see multiple requests.
You may have to set tftpd to do more logging to see the individual
requests.

Maybe you could run tcpdump and/or Ethereal to watch the packets and see
if you see the file get downloaded by the client.

If you can't make sense of it, then try:

tcpdump -i eth0 -s 1520 -w /tmp/tcpdump.out host ws001

Adjust the 'eth0' to match your setup, and the 'ws001' to match your
workstation.

Once the workstation fails, then email the /tmp/tcpdump.out file to me (as
an attachment) and i'll take a look at it in ethereal to see what's going
on.

Jim McQuillan

Post by Jens Korth
Any other idea?
Jens

Post by Jim McQuillan

Post by Jens Korth
Dear Jim,
thank you for offering your help. Here is the information.
-------------
pxelinux.cfg/default: (I don't belive that the problem is here. If I
prompt 0
label linux
kernel bzImage-2.6.17.8-ltsp-shuttle
append rw root=/dev/ram0 initrd=initramfs.gz NIC=tg3
--------
insgesamt 4348
-rw-r--r-- 1 root root 1689510 19. Oct 00:30
bzImage-2.6.17.8-ltsp-shuttle
-rw-r--r-- 1 root root 2734887 19. Oct 00:30 initramfs.gz
-rw-r--r-- 1 root root 11826 19. Oct 00:30 pxelinux.0
drwxr-xr-x 2 root root 4096 19. Oct 00:30 pxelinux.cfg
insgesamt 4
-rw-r--r-- 1 root root 115 19. Oct 00:33 default
-----------------------------
All that seems ok to me ?! Maybe the initramfs.gz is not built correctly
by the script?!

Post by Jens Korth
Thank you
Jens

Post by Jim McQuillan

Can you show us the pxelinux.cfg/default file that you are using?
Also,
a
listing of the directory where your kernel and initrd file reside might
ls -lR /tftpboot/lts
would be helpful.
Jim McQuillan

Post by Jens Korth
Any ideas what I missed?
Thank you very much for your help.
jens
-------------------------------------------------------------------------
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-----END PGP PUBLIC KEY BLOCK-----
-------------------------------------------------------------------------
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Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
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_____________________________________________________________________
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For additional LTSP help, try #ltsp channel on irc.freenode.net

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Best regards / Mit freundlichen Grüßen / Cordialement
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--------------------------------
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Albatross World Airports and Suppliers Database
Protect the privacy of your messages!
Email us your public PGP key and
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Todd Shoemaker

2006-10-20 02:06:24 UTC

Permalink

Jim-

When I built a custom kernel and provided my own custom label in the
kernel config (e.g. -ts-amd64-smp), the build_initramfs did not add this
information to the modules directory, so it would fail to build the
initramfs. I fixed it by adding the following line around line 166 and
editing the KERNEL_VER variable:

eval `grep "^CONFIG_LOCALVERSION" ${KERNEL_SRC}/.config`

KERNEL_VER=${VERSION}.${PATCHLEVEL}.${SUBLEVEL}${EXTRAVERSION}${CONFIG_LOCALVERSION}

This made it work. I don't know if this is the same problem that Jens
is having, but it could help others. I think the local version is a
newer variable that is kept in .config, whereas the other extraversion
used to be in another file, IIRC.

-Todd

Post by Jim McQuillan

Post by Jens Korth
Thank you
Jens

Post by Jim McQuillan

Can you show us the pxelinux.cfg/default file that you are using? Also, a
listing of the directory where your kernel and initrd file reside might
ls -lR /tftpboot/lts
would be helpful.
Jim McQuillan

Post by Jens Korth
Any ideas what I missed?
Thank you very much for your help.
jens
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_____________________________________________________________________
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--
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--------------------------------
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-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_____________________________________________________________________
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For additional LTSP help, try #ltsp channel on irc.freenode.net

Jim McQuillan

2006-10-20 02:10:40 UTC

Permalink

Post by Todd Shoemaker
Jim-
When I built a custom kernel and provided my own custom label in the
kernel config (e.g. -ts-amd64-smp), the build_initramfs did not add this
information to the modules directory, so it would fail to build the
initramfs. I fixed it by adding the following line around line 166 and
eval `grep "^CONFIG_LOCALVERSION" ${KERNEL_SRC}/.config`
KERNEL_VER=${VERSION}.${PATCHLEVEL}.${SUBLEVEL}${EXTRAVERSION}${CONFIG_LOCALVERSION}
This made it work. I don't know if this is the same problem that Jens
is having, but it could help others. I think the local version is a
newer variable that is kept in .config, whereas the other extraversion
used to be in another file, IIRC.

Very cool. I've not run into this before. I'll have to take a closer
look to see why it's worked fine for me in the past.

Thanks,
Jim.

Post by Todd Shoemaker
-Todd

Post by Jim McQuillan

Post by Jens Korth
Dear Jim,
thank you for offering your help. Here is the information.
-------------
pxelinux.cfg/default: (I don't belive that the problem is here. If I
prompt 0
label linux
kernel bzImage-2.6.17.8-ltsp-shuttle
append rw root=/dev/ram0 initrd=initramfs.gz NIC=tg3
--------
insgesamt 4348
-rw-r--r-- 1 root root 1689510 19. Oct 00:30
bzImage-2.6.17.8-ltsp-shuttle
-rw-r--r-- 1 root root 2734887 19. Oct 00:30 initramfs.gz
-rw-r--r-- 1 root root 11826 19. Oct 00:30 pxelinux.0
drwxr-xr-x 2 root root 4096 19. Oct 00:30 pxelinux.cfg
insgesamt 4
-rw-r--r-- 1 root root 115 19. Oct 00:33 default
-----------------------------
All that seems ok to me ?! Maybe the initramfs.gz is not built correctly
by the script?!

Post by Jens Korth
Thank you
Jens

Post by Jim McQuillan

Can you show us the pxelinux.cfg/default file that you are using?
Also,
a
listing of the directory where your kernel and initrd file reside might
ls -lR /tftpboot/lts
would be helpful.
Jim McQuillan

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Jens Korth

2006-10-20 16:01:12 UTC

Permalink

Dear Jim James, Todd,

thank you for all your help.

Unfoirtunately, no results :-(

1) Dear Todd,

Post by Todd Shoemaker
eval `grep "^CONFIG_LOCALVERSION" ${KERNEL_SRC}/.config`
KERNEL_VER=${VERSION}.${PATCHLEVEL}.${SUBLEVEL}${EXTRAVERSION}${CONFIG_LOCALVERSION}

As I didn't use the config's localversion string, that didn't change
anything. But its a good hint!

Post by Todd Shoemaker
OK now your modules are installed in /lib/modules/2.6.17-bla but you
need them
in /opt/ltsp/i386/lib/modules
make INSTALL_MOD_PATH=/opt/ltsp/i386 modules_install

That is strange. When I run the build_initramfs script, it copies the
modules from the /lib/modules directory to the ltsp directory tree. So
the modules are there.

I tried the Make command as mentioned by you, but it didn't help.

I am completely stuck.

any other ideas?
Jens

John P. New

2006-10-20 13:53:03 UTC

Permalink

While we're on the subject of the build_initramfs script, I'd like to
suggest a small change.

Part of the output of the script says:

Copying the PXE kernel to /tftpboot/lts

which really confused me as I had directed the kernel to be placed
somewhere else. Then I noticed that the location is hard-coded at line
364:

echo "Copying the PXE kernel to /tftpboot/lts"

So, I would suggest changing that line to:

echo "Copying the PXE kernel to ${TFTP_DIR}"

Hope that helps,

John P. New
London, Ontario, Canada

j***@tigger.ws

2006-10-19 23:24:13 UTC

Permalink

make
make modules_install

(I think make modules is harmless)

Post by Jens Korth
- run build_initramfs

OK now your modules are installed in /lib/modules/2.6.17-bla but you need them
in /opt/ltsp/i386/lib/modules

I did:
make INSTALL_MOD_PATH=/opt/ltsp/i386 modules_install

you can just copy them there too
James

j***@tigger.ws

2006-10-19 23:42:10 UTC

Permalink

Post by Jens Korth
I want a custom kernel because I need some other drivers for
sound/graphics etc. And I hoped for some better performance when
compiling for the specific processor (Pentium M).
I unpacked the initramfs.gz file.
The IS an init file in the root directory.
Very strange.
Maybe the .config file for the kernel is not correct.
Is there anything that could prevent the kernel from using the
initramfs.gz file?

[snip]
I recognize the preamble, I had exactly the same.
The initramfs failed because there were no modules
modules in and all worked
James

j***@tigger.ws

2006-10-21 00:57:04 UTC

Permalink

Post by John P. New
While we're on the subject of the build_initramfs script, I'd like to
suggest a small change.
Copying the PXE kernel to /tftpboot/lts
which really confused me as I had directed the kernel to be placed
somewhere else. Then I noticed that the location is hard-coded at line
echo "Copying the PXE kernel to /tftpboot/lts"
echo "Copying the PXE kernel to ${TFTP_DIR}"

Some distros will not allow you to change it. EG RedHat last time I looked.
The -s flag notwithstanding. (tftp won't work unless right flags and right
place)
I see no reason to change it and GOOD reason to not change it.
What is your argument?
James

John P. New

2006-10-21 01:16:54 UTC

Permalink

James,

I'm not advocating changing the behaviour of the build_initramfs script.
The script itself allows you to copy the PXE kernel to any location you
want: it asks for the "Location of TFTP directory". And the script
faithfully copies the PXE kernel to the location you specify (or
defaults to /tftpboot/lts).

However, regardless of where the PXE kernel is copied, the script
_output_ always says "Copying the PXE kernel to /tftpboot/lts". At best,
it is confusing; at worst, it won't alert the user that the PXE kernel
is being copied incorrectly.

My change just makes the script report what it's actually doing. I'm
changing an echo statement, not any script logic.

John

Post by j***@tigger.ws

j***@tigger.ws

2006-10-21 01:05:11 UTC

Permalink

Ha! I saw that too. (pulse) Not really sure how to replace that
with esd on the terminal though. Let us know if you
succeed...although, mot think of it I might know how to do it. Is
anyone else confused by the way that the esd daemon is referred to as
a *server*. It seems to me that if it's listening then it's really a
client. no? sorry for rambling....

Its all in the fine print <smile>
A SERVER offers some functionality like serving www pages or playing audio ...
A CLIENT makes use of the functionality like "pay my audio on your speakers
please"
James