Re: [uml-devel] 2.6 UML Kernel Woes (re UDB Device)

["roland" <for_spam@gmx.de>]

mhhhh....
do you use devfs=nomount with your 2.4.x kernel, too?
what about _trying_ devfs?

also see: http://usermodelinux.org/modules.php?name=News&file=article&sid=134

hth
roland


----- Original Message ----- 
From: "William R. Lorenz" <wrl@express.org>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Wednesday, March 10, 2004 8:47 AM
Subject: [uml-devel] 2.6 UML Kernel Woes (re UDB Device)


> Greetings,
> 
> I've grabed the 2.6.3 kernel source an applied uml-patch-2.6.3-rc2-1.bz2
> as made available on the UML site @ SourceForge.  I've then configured the
> kernel with a `make ARCH=um menuconfig`, compiled it with a `make ARCH=um
> linux`, and tried to run it on a 2.4.23 skas3+fairsched patched host.  I
> also added in an MPPE patch for PPTP-related stuff, which should be fine.
> 
> When I run the 2.6.3 binary, I get the following error to the console:
> 
>   VFS: Cannot open root device "ubd0" or unknown-block(0,0)
>   Please append a correct "root=" boot option
>   Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)
> 
> I'm calling the UML binary with the following command-line options:
> 
>   user$ ./linux-2.6.3.mppe.bin devfs=nomount mem=128M \
>     ubd0=fedora-core1.disk \
>     con0=fd:0,fd:1 con=/dev/null \
>     eth0=tuntap,tap3 root=/dev/ubd0
> 
> It's not a permissions problem with the 'fedora-core1.disk' file, as this
> file works just fine with a 2.4.x UML kernel, and it's an ext3 filesystem:
> 
>   [root@phobos linux-2.6.3]# grep EXT3 .config
>   CONFIG_EXT3_FS=y
>   CONFIG_EXT3_FS_XATTR=y
>   CONFIG_EXT3_FS_POSIX_ACL=y
>   # CONFIG_EXT3_FS_SECURITY is not set
>   [root@phobos linux-2.6.3]# grep EXT2 .config
>   CONFIG_EXT2_FS=y
>   # CONFIG_EXT2_FS_XATTR is not set
>   [root@phobos linux-2.6.3]# 
> 
> I've attached the complete kernel .config I used for this 2.6 compilation.
> 
> Any help would be very much appreciated.  Thanks, in advance.
> 
> --          _ 
> __ __ ___ _| | William R. Lorenz <wrl@express.org> 
> \ V  V / '_| | http://www.clevelandlug.net/ ; "Every revolution was 
>  \./\./|_| |_| first a thought in one man's mind." - Ralph Waldo Emerson 
> 


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