Re: [uml-devel] Building a UML uClinux(Busybox/uClibc) filesystem

[Antoine Martin <antoine@nagafix.co.uk>]

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Andrew Sinclair wrote:
> Hello all,
> 
> I've been able to use the pre-built Busybox 1.5.0 filesystem at
> http://uml.nagafix.co.uk/ perfectly with the same UML kernel I am using.
> 
> 
> Unfortunately, when trying to generate my own filesystem, my kernel no
> longer works. It basically stops after mounting the filesystem. 
You may want to diff the config I used with yours:
http://uml.nagafix.co.uk/BusyBox-1.5.0/amd64.config
And see if anything major turns up.

> When I try and use gdb to debug I get stuck in
> arch/um/include/um_uaccess.h:50
> 
> static inline int copy_to_user(void __user *to, const void *from, int n)
> {
>         return(CHOOSE_MODE_PROC(copy_to_user_tt, copy_to_user_skas, to, 
>                                 from, n));
> }
> 
> If I put the kernel in tracing thread mode, to avoid this, it falls over
> even with the prebuilt nagafix filesystem.
> 
> I have been unable to build the automated Busybox root filesystem
> builder (based on buildroot) on
> http://user-mode-linux.sourceforge.net/contrib.html
> A number of the package download links in the makefile no longer exist,
> so I searched the web for the packages from other locations. Perhaps I
> have the wrong packages. I have got it to the point where it is looking
> for a uml-gcc that is not in the build folder.
> 
> I've noticed that the nagafix prebuilt filesystem has no lib folder. I
> guess this means that the pre-built filesystem was built with glibc?
> (Unlike the mine or the buildroot variant which use uClibc)
IIRC, that's because it was built with the static option.

Antoine
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