[LITMUS^RT] about installation of LITMUS-RT

[Björn Brandenburg]

Hi Tianyang,

I think Jeff and Glenn are onto the right problem: the line "unable to mount root fs" means you are either missing the correct file system module or the correct block device driver (or both). You might also be trying to boot a kernel that needs an initrd without an initrd (the initrd may contain essential drivers).

In short, this has nothing to do with LITMUS^RT, but rather with the underlying Linux configuration. As Glenn suggested, try compiling and booting an unmodified Linux kernel first, and then proceed from there.

Cheers,
Björn

On Jul 1, 2013, at 10:04 PM, Xin Zhou <jeffzhou at uab.edu> wrote:

> Hi Tianyang,
> 
> Default configuration, generally might not boot the system.
> Tries to remove redundant modules and only use exactly necessary driver, file system, etc.
> Hope this would help.
> 
> 
> regards,
> 
> Jeff Zhou
> From: litmus-dev-bounces at lists.litmus-rt.org [litmus-dev-bounces at lists.litmus-rt.org] on behalf of Glenn Elliott [gelliott at cs.unc.edu]
> Sent: Monday, July 01, 2013 1:11 PM
> To: litmus-dev at lists.litmus-rt.org
> Subject: Re: [LITMUS^RT] about installation of LITMUS-RT
> 
> 
> On Jul 1, 2013, at 9:17 AM, Tianyang Che <tche at hawk.iit.edu> wrote:
> 
>> Dear all,
>> 
>> My name is Tianyang Che. I've encountered some difficulties during installing the litmus-rt. I was following the installation instruction provided by the litmus-rt website.
>> 
>> I've summarized my method below:
>> 
>> cd $DIR
>> # get Linux 3.0
>> wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.bz2
>> tar xjf linux-3.0.tar.bz2
>> wget http://www.litmus-rt.org/releases/2012.3/litmus-rt-2012.3.patch
>> mv linux-3.0 litmus-rt
>> # apply the LITMUS RT patch
>> cd litmus-rt
>> patch -p1 < ../litmus-rt-2012.3.patch
>> 
>> #as for the configuration file, I just used the sample config which is provided in the website.
>> make menuconfig
>> # compile the kernel
>> make bzImage
>> make modules
>> make modules_install
>> make install
>> mkinitradfs -o initrd.img-3.0.0-litmus-litmus2012.2 3.0.0-litmus-litmus2012.2
>> update-grub
>> 
>> 
>> Then when I was trying to get into the new kernel, I always got this initial image.
>> <image.png>
>> 
>> I installed litmus-rt under kernel v3.0. And I used Ubuntu 12.04, both on virtual machine and real computer.
>> 
>> 
>> Hope to get help from you. Thank you very much.
>> 
>> 
>> 
>> Sincerely,
>> Tianyang.
> 
> 
> Hi Tianyang,
> 
> Are you able to boot into the vanilla Linux 3.0 kernel without the Litmus patch applied?  We should probably figure out if the problem is with the Litmus patch or with the config file.  It is most likely the later, but we can try to rule out the Litmus patch as the cause.  The configuration file needs to be tailored to support your system's hardware.
> 
> -Glenn
> 
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