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Trouble booting Tiny Core in usermodelinux

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btheado:
I'm interested in booting into Tiny Core using usermodelinux (UML)  and haven't been able to get it to work yet.

I downloaded and bunzipped the latest 32-bit UML kernel/executable from [removed, see 4 - sources?].


--- Code: ---wget [...]
bunzip2 kernel32-2.6.36.2.bz2
chmod +x kernel32-2.6.36.2

--- End code ---

Then I tried to boot the Tiny Core initial ramdisk (which I have named tinycore-341.gz) using that kernel:


--- Code: ---./kernel32-2.6.36.2 initrd=tinycore-341.gz text
--- End code ---

That segfaulted and it turned out to be because UML defaults to allocating just 32M of ram to the guest instance.

If I allocate more memory, then it seems to boot correctly until it gets to the last step of actually logging in as the tc user.  At that point it doesn't give a login prompt or a shell prompt and I haven't figured out what to do to troubleshoot it.  Here is the command I'm running:


--- Code: --- ./kernel32-2.6.36.2 initrd=tinycore-341.gz mem=128M nozswap text pause
--- End code ---

Here is some of the output from the boot:

Booting tinycore_3.4.1
Running Linux Kernel 2.6.36.2.
Checking boot options...Done.
Starting udev daemon for hotplug support...[    2.210000] udevd (968): /proc/968
/oom_adj is deprecated, please use /proc/968/oom_score_adj instead.            
Done.                                                                          
Skipping compressed swap in ram as requested from the boot command line.        
Scanning hard disk partitions to create /etc/fstab                              
Setting Language to C Done.                                                    
Setting Timezone to UTC Done.                                                  
hwclock: can't open '/dev/misc/rtc': No such file or directory                  
Possible swap partition(s) enabled.                                            
Loading Tiny Core Extensions...Done.                                            
Setting keymap to usloadkmap: can't open console                                
 Done.                                                                          
Boot time configuration completed. Press <Enter> to continue.


After I press <Enter>, I see this and then nothing else:

[   16.910000] Virtual console 1 assigned device '/dev/ptyp0'
login[1750]: root login on 'tty1'                                                                                                                    


Anyone have any ideas on what I can do to further troubleshoot?

As a check to make sure I can get UML working at all, I downloaded a DSL image from [...] and successfully get a shell prompt with it:


--- Code: ---wget [...]
bunzip2 DSL-4.4-root_fs.bz2
./kernel32-2.6.36.2 ubda=DSL-4.4-root_fs

--- End code ---

gerald_clark:
I doubt the modules in tinycore.gz will be compatible with your kernel.

btheado:
By 'modules' are you referring to kernel modules?  Based on my experience with booting Tiny Core using the colinux kernel (http://forum.tinycorelinux.net/index.php?topic=7348), I thought none of the kernel modules in tinycore.gz were crucial for getting to the shell prompt.  I can boot using the colinux kernel and unmodified tinycore.gz and get to a shell prompt.  The output of 'lsmod' shows no loaded modules.

So I thought the same might work for the UML kernel.  But maybe both the tinycore kernel and the colinux kernel have something crucial compiled in which the UML kernel lacks?  Any idea how I can find out?

gerald_clark:
If all you ever want to do is get a shell prompt, go ahead.

btheado:

--- Quote from: gerald_clark on January 01, 2011, 08:59:52 PM ---If all you ever want to do is get a shell prompt, go ahead.

--- End quote ---

That's what I'm trying to do, but it isn't working.  I don't get a shell prompt and I'm trying to figure out why.

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