debian realtime kernel config 2.6.25.8.rt7

[Emanuel Rumpf-2]

I thought, it would probably help some of you, if I uploaded
my rt-config for a 2.6.25.8 realtime kernel (debian system).

# get my kernel config:
wget http://branwelt.de/download/config.gz

(this is all without any warrenty, use at your own risc)

Below is also a kind of script, that should do the whole procedure
for creating a 2.6.25.8 realtime kernel on a debian based system.

I have not testet this script.
I would recommend, to past command for command, and see if it is
working for you. (it should)
This is how I build the kernel I'm currently using.

Note: The config has the realtime-patch applied, but is not
strictly configured for realtime:
I let enabled acpi and cpu-frequency scaling,
because performance was good enough for my requirements
(2.67ms latency at 48000hz samplerate according to qjackctl).
If you encounter xruns, disable these options with "make menuconfig"
(see bottom)

I tried to keep the config general, so it may be usable on other
systems as well.
It is based on a sidux ~ 2.6.21 configuration, including updates for 2.6.25


start of the command list:
#############################################################
#############################################################


mkdir my_realtime_kernel
cd my_realtime_kernel



# get my kernel config
wget http://branwelt.de/download/config.gz

# get the kernel
wget http://www.eu.kernel.org/pub/linux/kernel/v2.6/linux-2.6.25.8.tar.bz2

# get rt-patch
wget http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.25.8-rt7.bz2


# unpack
tar xfj linux-2.6.25.8.tar.bz2
tar xfj patch-2.6.25.8-rt7.bz2

# create a symbolic link
ln -s linux-2.6.25.8 linux
cd linux



# apply patch
patch -p1 < ../patch-2.6.25.8-rt7

# move config to right place
zcat ../config.gz > ./.config


# now edit the Makefile
# change the line with EXTRAVERSION (without #) to:
# EXTRAVERSION = .8.rt7.em1


# optionally do make oldconfig
# or make menuconfig here


# make the kernel
make-kpkg --initrd kernel_image
cd ..


# finally install the kernel with a command like
# dpkg -i linux-image-2.6.25.8.rt7.em1_2.6.25.8.rt7.em1-10.00.Custom_i386.deb




#############################################################
#############################################################
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[Schoap D]

Emanuel Rumpf wrote:

> I thought, it would probably help some of you, if I uploaded
> my rt-config for a 2.6.25.8 realtime kernel (debian system).
>
> # get my kernel config:
> wget http://branwelt.de/download/config.gz
>
> (this is all without any warrenty, use at your own risc)
>
> Below is also a kind of script, that should do the whole procedure
> for creating a 2.6.25.8 realtime kernel on a debian based system.
>
> I have not testet this script.
> I would recommend, to past command for command, and see if it is
> working for you. (it should)
> This is how I build the kernel I'm currently using.
>
> Note: The config has the realtime-patch applied, but is not
> strictly configured for realtime:
> I let enabled acpi and cpu-frequency scaling,
> because performance was good enough for my requirements
> (2.67ms latency at 48000hz samplerate according to qjackctl).
> If you encounter xruns, disable these options with "make menuconfig"
> (see bottom)
>
> I tried to keep the config general, so it may be usable on other
> systems as well.
> It is based on a sidux ~ 2.6.21 configuration, including updates for 2.6.25
>
>
> start of the command list:
> #############################################################
> #############################################################
>
>
> mkdir my_realtime_kernel
> cd my_realtime_kernel
>
>
>
> # get my kernel config
> wget http://branwelt.de/download/config.gz
>
> # get the kernel
> wget http://www.eu.kernel.org/pub/linux/kernel/v2.6/linux-2.6.25.8.tar.bz2
>
> # get rt-patch
> wget http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.25.8-rt7.bz2
>
>
> # unpack
> tar xfj linux-2.6.25.8.tar.bz2
> tar xfj patch-2.6.25.8-rt7.bz2
>
> # create a symbolic link
> ln -s linux-2.6.25.8 linux
> cd linux
>
>
>
> # apply patch
> patch -p1 < ../patch-2.6.25.8-rt7
>
> # move config to right place
> zcat ../config.gz > ./.config
>
>
> # now edit the Makefile
> # change the line with EXTRAVERSION (without #) to:
> # EXTRAVERSION = .8.rt7.em1
>
>
> # optionally do make oldconfig
> # or make menuconfig here
>
>
> # make the kernel
> make-kpkg --initrd kernel_image
> cd ..
>
>
> # finally install the kernel with a command like
> # dpkg -i linux-image-2.6.25.8.rt7.em1_2.6.25.8.rt7.em1-10.00.Custom_i386.deb
>
>
>
>
> #############################################################
> #############################################################
> _______________________________________________
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> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
>
>  

Thanks for this howto!

Don't you build a linux-headers file?


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[Emanuel Rumpf-2]

2008/7/7 schoappied <schoappied@...>:
> Emanuel Rumpf wrote:

small mistake:

>> tar xfj patch-2.6.25.8-rt7.bz2

is no tar file! use
   bunzip2 patch-2.6.25.8-rt7.bz2
instead

(or install unp !!)
>
> Don't you build a linux-headers file?
>

I never needed them. Maybe because
I always kept the source in /usr/src/linux
which does have them anyway.

I you need them for building modules make them:
make-kpkg kernel_headers
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[Schoap D]

Emanuel Rumpf wrote:

> 2008/7/7 schoappied <schoappied@...>:
>  
>> Emanuel Rumpf wrote:
>>    
>
> small mistake:
>
>  
>>> tar xfj patch-2.6.25.8-rt7.bz2
>>>      
>
> is no tar file! use
>    bunzip2 patch-2.6.25.8-rt7.bz2
> instead
>
> (or install unp !!)
>  
>> Don't you build a linux-headers file?
>>
>>    
>
> I never needed them. Maybe because
> I always kept the source in /usr/src/linux
> which does have them anyway.
>
> I you need them for building modules make them:
> make-kpkg kernel_headers
> _______________________________________________
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> Linux-audio-user@...
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
>
>  

I build the kernel as your said.
Followed the steps.
checked it for a while with make oldconfig
and make xconfig

but I didn't change anything...

Same message, same errors....
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[Giuseppe Zompatori-2]

2008/7/7 Emanuel Rumpf <xbran@...>:
> I thought, it would probably help some of you, if I uploaded
> my rt-config for a 2.6.25.8 realtime kernel (debian system).
<snip>
> tar xfj patch-2.6.25.8-rt7.bz2
> zcat ../config.gz > ./.config
</snip>

You can use those compressed files directly/in-line by using the z/bz
prefixed version of cat, i.e.:

bzcat ../patch-2.6.25.8-rt7.bz2 | patch -p1

and

zcat ../config.gz >./.config

It saves a little bit of space, handy to know when you're short of it ;)

Cheers
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[Emanuel Rumpf-2]

2008/7/7 schoappied <schoappied@...>:
> Emanuel Rumpf wrote:
>>
>> 2008/7/7 schoappied <schoappied@...>:
>
> Same message, same errors....
>

those IIRC ?:
----------------------------------
fsck.ext3: no such file or directory while trying to open /dev/hda2
/dev/hda2
The superblock could not be read or does not describe a correct ext2
filesystem. If the device is  valid and it really contains an ext2
filesystem (and not swap or ufs or something else) then the superblock
is corrupt, and you might try running e2fsk with an alternate
superblock:
e2fsck -b 8193 <device>

fsck died with exit status 8
failed (code 8)
-------------------------------------


I don't have a sollution here.

maybe you should try as suggested:
e2fsck -b 8193 /dev/hda2
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[Emanuel Rumpf-2]

2008/7/7 Giuseppe Zompatori <siliconjoe@...>:
>
> You can use those compressed files directly/in-line by using the z/bz
> prefixed version of cat, i.e.:
>
> bzcat ../patch-2.6.25.8-rt7.bz2 | patch -p1
>
ah.. there's also bzcat
thanks for the hint :)
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[Schoap D]

Emanuel Rumpf wrote:

> 2008/7/7 schoappied <schoappied@...>:
>  
>> Emanuel Rumpf wrote:
>>    
>>> 2008/7/7 schoappied <schoappied@...>:
>>>      
>> Same message, same errors....
>>
>>    
>
> those IIRC ?:
> ----------------------------------
> fsck.ext3: no such file or directory while trying to open /dev/hda2
> /dev/hda2
> The superblock could not be read or does not describe a correct ext2
> filesystem. If the device is  valid and it really contains an ext2
> filesystem (and not swap or ufs or something else) then the superblock
> is corrupt, and you might try running e2fsk with an alternate
> superblock:
> e2fsck -b 8193 <device>
>
> fsck died with exit status 8
> failed (code 8)
> -------------------------------------
>
>
> I don't have a sollution here.
>
> maybe you should try as suggested:
> e2fsck -b 8193 /dev/hda2
> _______________________________________________
>
>  

Yes, same garbage...

I'll check the e2fsck...

Thanks anyway, also for your howto.
I'm gonna stick with the praised 64studio so I wouldn't complain...
allthough.. spend many many hours to get it right....

About oldconfig and menu config:

When I want to use exactly the same config file as you have (copied that
.config to the new to build kernel folder)... Should I do oldconfig
and/or xconfig? or just start to build that kernel? And what if the
.config file is from a much older kernel? what will happen with the new
kernel configure options? And when you do make oldconfig.. what should
be the answer to the ask questions? just hit ENTER or N, y, m ?

Thanks in advance,


And

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[Schoap D]

schoappied wrote:

> Emanuel Rumpf wrote:
>  
>> 2008/7/7 schoappied <schoappied@...>:
>>  
>>    
>>> Emanuel Rumpf wrote:
>>>    
>>>      
>>>> 2008/7/7 schoappied <schoappied@...>:
>>>>      
>>>>        
>>> Same message, same errors....
>>>
>>>    
>>>      
>> those IIRC ?:
>> ----------------------------------
>> fsck.ext3: no such file or directory while trying to open /dev/hda2
>> /dev/hda2
>> The superblock could not be read or does not describe a correct ext2
>> filesystem. If the device is  valid and it really contains an ext2
>> filesystem (and not swap or ufs or something else) then the superblock
>> is corrupt, and you might try running e2fsk with an alternate
>> superblock:
>> e2fsck -b 8193 <device>
>>
>> fsck died with exit status 8
>> failed (code 8)
>> -------------------------------------
>>
>>
>> I don't have a sollution here.
>>
>> maybe you should try as suggested:
>> e2fsck -b 8193 /dev/hda2
>> _______________________________________________
>>
>>  
>>    
>
> Yes, same garbage...
>
> I'll check the e2fsck...
>
> Thanks anyway, also for your howto.
> I'm gonna stick with the praised 64studio *kernel* so I will not complain...
> allthough.. spend many many hours to get it right....
>
> About oldconfig and menu config:
>
> When I want to use exactly the same config file as you have (copied that
> .config to the new to build kernel folder)... Should I do oldconfig
> and/or xconfig? or just start to build that kernel? And what if the
> .config file is from a much older kernel? what will happen with the new
> kernel configure options? And when you do make oldconfig.. what should
> be the answer to the ask questions? just hit ENTER or N, y, m ?
>
> Thanks in advance,
>
>
> And
>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@...
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
>
>  

*kernel
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[Schoap D]

schoappied wrote:

> Emanuel Rumpf wrote:
>  
>> 2008/7/7 schoappied <schoappied@...>:
>>  
>>    
>>> Emanuel Rumpf wrote:
>>>    
>>>      
>>>> 2008/7/7 schoappied <schoappied@...>:
>>>>      
>>>>        
>>> Same message, same errors....
>>>
>>>    
>>>      
>> those IIRC ?:
>> ----------------------------------
>> fsck.ext3: no such file or directory while trying to open /dev/hda2
>> /dev/hda2
>> The superblock could not be read or does not describe a correct ext2
>> filesystem. If the device is  valid and it really contains an ext2
>> filesystem (and not swap or ufs or something else) then the superblock
>> is corrupt, and you might try running e2fsk with an alternate
>> superblock:
>> e2fsck -b 8193 <device>
>>
>> fsck died with exit status 8
>> failed (code 8)
>> -------------------------------------
>>
>>
>> I don't have a sollution here.
>>
>> maybe you should try as suggested:
>> e2fsck -b 8193 /dev/hda2
>> _______________________________________________
>>
>>  
>>    
>
> Yes, same garbage...
>
> I'll check the e2fsck...
>
> Thanks anyway, also for your howto.
> I'm gonna stick with the praised 64studio so I wouldn't complain...
> allthough.. spend many many hours to get it right....
>
> About oldconfig and menu config:
>
> When I want to use exactly the same config file as you have (copied that
> .config to the new to build kernel folder)... Should I do oldconfig
> and/or xconfig? or just start to build that kernel? And what if the
> .config file is from a much older kernel? what will happen with the new
> kernel configure options? And when you do make oldconfig.. what should
> be the answer to the ask questions? just hit ENTER or N, y, m ?
>
> Thanks in advance,
>
>
> And
>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@...
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
>
>  

I tried to build it on another debian lenny/sid system, also a P4 and it
works just fine. So its not totally my fault ;) :)

Then the cause is my system, Dell Precision 360 ... maybe the
initrd.img-, maybe ATA?


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[Emanuel Rumpf-2]

2008/7/8 schoappied <schoappied@...>:
> About oldconfig and menu config:
>
> When I want to use exactly the same config file as you have (copied that
> .config to the new to build kernel folder)... Should I do oldconfig and/or
> xconfig?

if the config-file matches the kernel version a copy should be enough

as I understand it, oldconfig is only required with a new or modified
kernel-version
i.O. to update it for new config-options.

> or just start to build that kernel? And what if the .config file is
> from a much older kernel?

it doesn't have all the config options then;
I would expect make to fail

> what will happen with the new kernel configure
> options? And when you do make oldconfig.. what should be the answer to the
> ask questions? just hit ENTER or N, y, m ?

with some exeptions m should be ok,
but just hitting enter, without understanding what happens
can blaot/break your kernel config (with incompatible/unrecommended
options etc.)
so it's a good idea to "?" first.
I would expect [enter] to choose a reasonable default, but who knows...

regarding your problem:
I would guess a misconfiguration of your system
( maybe it's grub, maybe fstab, initrd.img, ... )

and btw.: please don't always quote the whole message on reply
just necessary phrases with direct relation.
in general we all know, what has been written before in the discussion-thread...
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[Emanuel Rumpf-2]

2008/7/10 David Baron <d_baron@...>:

> What about intel 32-bit?

My system is 32-bit. And the config I provided too.
I'm not informed, if and what would be required to be changed for 64-bit.
-- If that was your question ?
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[David Baron]

On Thursday 10 July 2008 20:44:38 Emanuel Rumpf wrote:

> 2008/7/10 David Baron <d_baron@...>:
> > What about intel 32-bit?
>
> My system is 32-bit. And the config I provided too.
> I'm not informed, if and what would be required to be changed for 64-bit.
> -- If that was your question ?
> _______________________________________________
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In the arch subdirectory, there is no i386 folder. This symlink to this would
be created (I have to do this myself with debian's stuff) when making the
kernel.

~$ ls /usr/src/linux-source-2.6.23-rt1/arch
alpha  blackfin  h8300  m32r       mips     ppc   sh64     um      xtensa
arm    cris      i386   m68k       parisc   s390  sparc    v850
avr32  frv       ia64   m68knommu  powerpc  sh    sparc64  x86_64
-$ ls /usr/src/linux-2.6.25.8/arch
alpha  blackfin  h8300    m32r       mips     powerpc  sh       um    xtensa
arm    cris      ia64     m68k       mn10300  ppc      sparc    v850
avr32  frv       Kconfig  m68knommu  parisc   s390     sparc64  x86

I guess the "x86" would be it.
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[Emanuel Rumpf-2]

2008/7/10 David Baron <d_baron@...>:

> In the arch subdirectory, there is no i386 folder. This symlink to this would
> be created (I have to do this myself with debian's stuff) when making the
> kernel.
>
> ~$ ls /usr/src/linux-source-2.6.23-rt1/arch
> alpha  blackfin  h8300  m32r       mips     ppc   sh64     um      xtensa
> arm    cris      i386   m68k       parisc   s390  sparc    v850
> avr32  frv       ia64   m68knommu  powerpc  sh    sparc64  x86_64
> -$ ls /usr/src/linux-2.6.25.8/arch
> alpha  blackfin  h8300    m32r       mips     powerpc  sh       um    xtensa
> arm    cris      ia64     m68k       mn10300  ppc      sparc    v850
> avr32  frv       Kconfig  m68knommu  parisc   s390     sparc64  x86
>
> I guess the "x86" would be it.

I haven't had to symlink anything there.
In my src-folder, the i386 dir is present (at least after compilation):

$/usr/src/linux-2.6.25.8/arch# ls
alpha  blackfin  h8300  Kconfig  m68knommu  parisc   s390   sparc64  x86
arm    cris      i386   m32r     mips       powerpc  sh     um       xtensa
avr32  frv       ia64   m68k     mn10300    ppc      sparc  v850

Make shure your download is valid (not broken).
hint: The config assumes pentium4 or later. For anything
below/incompatible run "make menuconfig"
and select your architecture (in processor type/features).
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[David Baron]

On Friday 11 July 2008 08:35:55 Emanuel Rumpf wrote:

> 2008/7/10 David Baron <d_baron@...>:
> > In the arch subdirectory, there is no i386 folder. This symlink to this
> > would be created (I have to do this myself with debian's stuff) when
> > making the kernel.
> >
> > ~$ ls /usr/src/linux-source-2.6.23-rt1/arch
> > alpha  blackfin  h8300  m32r       mips     ppc   sh64     um      xtensa
> > arm    cris      i386   m68k       parisc   s390  sparc    v850
> > avr32  frv       ia64   m68knommu  powerpc  sh    sparc64  x86_64
> > -$ ls /usr/src/linux-2.6.25.8/arch
> > alpha  blackfin  h8300    m32r       mips     powerpc  sh       um  
> > xtensa arm    cris      ia64     m68k       mn10300  ppc      sparc  
> > v850 avr32  frv       Kconfig  m68knommu  parisc   s390     sparc64  x86
> >
> > I guess the "x86" would be it.
>
> I haven't had to symlink anything there.
> In my src-folder, the i386 dir is present (at least after compilation):
>
> $/usr/src/linux-2.6.25.8/arch# ls
> alpha  blackfin  h8300  Kconfig  m68knommu  parisc   s390   sparc64  x86
> arm    cris      i386   m32r     mips       powerpc  sh     um       xtensa
> avr32  frv       ia64   m68k     mn10300    ppc      sparc  v850
>
> Make shure your download is valid (not broken).
> hint: The config assumes pentium4 or later. For anything
> below/incompatible run "make menuconfig"
> and select your architecture (in processor type/features).
> _______________________________________________
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Download is OK, patch works OK.
I am set up for 32 bit and PIII=Y
The compilation is running, is using arch/x86
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[David Baron]

On Monday 07 July 2008 23:31:30 Giuseppe Zompatori wrote:

> 2008/7/7 Emanuel Rumpf <xbran@...>:
> > I thought, it would probably help some of you, if I uploaded
> > my rt-config for a 2.6.25.8 realtime kernel (debian system).
>
> <snip>
>
> > tar xfj patch-2.6.25.8-rt7.bz2
> > zcat ../config.gz > ./.config
>
> </snip>
>
> You can use those compressed files directly/in-line by using the z/bz
> prefixed version of cat, i.e.:
>
> bzcat ../patch-2.6.25.8-rt7.bz2 | patch -p1
>

Did all that, worked like a charm:

1. realtime apparently cannot be set to be modularized as in previous
versions. WIll NOT accept:
CONFIG_SECURITY_CAPABILITIES=m
CONFIG_REALTIME_CAPABILITIES=m

but insists on CONG_SECURITY_CAPABILITIES=y

I have not objection to rlimits but cannot find this.

2. My old nvidia driver will not compile. I can check back on their site for
an upgrade but this is for an older mx400 card!
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