[aklug] Re: Kernel 2.6.15 doesn't have core 2 support

Damien Hull wrote:
> Arthur Corliss wrote:
>
>> On Wed, 16 Jan 2008, Damien Hull wrote:
>>
>>
>>
>>> Ubuntu Dapper has kernel 2.6.15. I installed the source package and ran
>>> make menuconfig. Looking through the processor family section I don't
>>> see anything on the core 2. It does have Xeon support.
>>>
>>>
>> The core 2 option in some kernel revs has nothing to do with SMP support, it
>> only activates some core 2 specific optimizations, nothing more. Any
>> generic SMP x86 kernel w/APIC enabled will show multiple processors.
>>
>> It was pointed out how to rebuild a 2.6 kernel from an existing, running
>> kernel, but here's a cheat sheet:
>>
>> # Start from a clean kernel tree
>> cd /usr/src/linux
>> make mrproper
>>
>> # Import current kernel settings
>> gzip -dc /proc/config.gz > .config
>> # If /proc/config.gz isn't present it may have been built as a module,
>> # so try 'modprobe configs'. If it works, it'll show up in /proc now.
>> # If you still don't have /proc/config.gz, look for a config-??? in
>> # /boot, your distro provider may have been kind enough to copy it
>> # there as well. Copy it to ./.config
>> yes "" | make oldconfig
>>
>> # Make any desired changes
>> make menuconfig
>>
>> # Check to see if the distro has automated kernel installation
>> which installkernel
>> # If it's there, all that you should have to do is:
>> make
>> make modules_install
>> make install
>> # If it's not there, things get a bit more hairy, depending on the
>> # use of initramfs, etc. At its simplest all that's needed is to copy
>> # (on x86) arch/i386/boot/bzImage to /boot/vmlinuz, and reinstall your
>> # bootloader (if using lilo -- grub doesn't require anything to be done).
>> # The System.map file is optional, and only really needed to get some
>> # readable kernel panic messages. But if you're system isn't dying
>> # from a kernel panic, it's never used.
>> # If you're using an initrd/initramfs you will need to update that image
>> # to, at a minimum, update the kernel modules. initrds can be
>> # decompressed and mounted via loopbacks to do so, initramfs are just
>> # compressed cpio archives. Just extract and and recreate after updating.
>>
>> # If you want to make an installable package for your distro, some of the
>> # following options may help
>> make deb-pkg
>> make binrpm-pkg
>>
>> Final notes: a lot of kernel options can be tweaked/enabled/disabled by
>> kernel commands. You can see what your bootloader passed to your kernel
>> when it was launched by 'cat /proc/cmdline'. Modifying your bootloader may
>> be needed to undo those kind of overrides.
>>
>> Compiling kernels isn't deep magic or complicated, but it does take some
>> knowledge of hardware and how it works together. If you know that much
>> configuring a kernel can often be blindingly obvious.
>>
>> Looking at this thread I have to think that explaining the entire boot
>> process, from system firmware to bootloader, to kernel, to init, is
>> necessary to clear up some confusion. FNL, anyone?
>>
>> --Arthur Corliss
>> Live Free or Die
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>>
>>
> After thinking about it this morning I believe I figured out the
> problem. I had to add the following to the kernel to get Dapper installed.
>
> * noapic
> * nolapic
> * noacpi
> * acpi=off
>
> Once Dapper was installed I had to leave these option in there. When I
> installed 2.6.23-14 the above option were also added in grub. With these
> options /proc/cpuinfo showed only one processor. For some reason I
> decided to take these options out. Once I did that I was able to get two
> cores in /proc/cpuinfo.
>
> This leads me to believe that kernel 2.6.15 might work with the core 2
> duo. However, it won't work with my motherboard. Not unless I add noapic
> etc...
>
> Feel free to create me if I'm wrong.
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>
If it helps I'm using the following motherboard.

    *

      INT D946GZISSL 775 SATA DDR2

This works with the new kernel and I had no trouble with Ubuntu Gutsy
Gibbon. I hope this isn't confusing people.
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Received on Thu Jan 17 11:16:15 2008