[PlanetCCRMA] Install of Planet CCRMA for 64-bit Fedora 10 Went Well Except On Rebooting There Is No New rt Kernel

Sean Beeson seanbeeson at gmail.com
Tue Mar 10 23:45:25 PDT 2009

> Hmmm...
>> What do you see in a terminal if you do:
>>  rpm -q kernel-rt
>> If planetccrma-core installed then you should have at least one realtime
>> kernel listed there. Then I would check the contents
>> of /boot/grub/grub.conf, you should have an entry there for the rt
>> kernel and it should probably be the default - "index" points to the 0
>> based index of the default kernel.
>> -- Fernando
> [root at ceres sean]# rpm -q kernel-rt
> kernel-rt-
> [root at ceres sean]# cat /boot/grub/grub.conf
> # grub.conf generated by anaconda
> #
> # Note that you do not have to rerun grub after making changes to this file
> # NOTICE:  You have a /boot partition.  This means that
> #          all kernel and initrd paths are relative to /boot/, eg.
> #          root (hd0,0)
> #          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
> #          initrd /initrd-version.img
> #boot=/dev/sda
> default=0
> timeout=3
> splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title Fedora (
>     root (hd0,0)
>     kernel /vmlinuz- ro
> root=UUID=c14b36c6-4eab-4def-b2ec-a33a006c5164 rhgb quiet
>     initrd /initrd-
> [root at ceres sean]#
> -------------------------
> Is it just a matter of adding my own entry for the kernel in grub? What
> information should I use there, if so?
> Thanks,
> -Sean

Well, after reading up on adding kernels to grub, I know that I just need to
make an entry just like what is there which points to the new kernel.
However, the only initrd img file on my system is the one you see in my
grub.conf file: /boot/initrd- which is
clearly is for the vmlinuz- kernel. After
reading further about initrd images, which are for storing drivers in a
ramdisk so that the kernel can mount / and kick off init and can be avoided
if you build your drivers right into the kernel instead of into modules, a
difference to how the planetccrma-core rpm builds its' kernel to how the
default fc10 kernel gets build is reveled and some questions come to mind.
Obviously, the planetccrma-core kernel has drivers build into it and I
should be fine having another entry for the rt-kernel without the initrd
entry. I guess putting an entry in grub and rebooting is going to tell me
real fast if my assumptions are correct. The questions I have are:

   1. Are the modules that were in the original fc10 initrd file get put in
   the new rt-kernel? I am thinking somehow my system needed them, if the
   default fc10 install put them there.
   2. If the rt-kernel has all the modules now, how does adding modules in
   the future work for other hardware and such?
   3. Is that strange root=UUID=c14b36c6-4eab-4def-b2ec-a33a006c5164 still
   needed and, if not, what do I use?
   4. How do I go about changing any module or updating it in the future?
   5. In addition to the current topic, but something I have always
   wonderd--as yum updates get applied after using the rt-kernel, are these
   updates being applied to the rt-kernel and do they retain the low latancy of

Thanks and currious,

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