Re: [uml-devel] ANSWER: Basics of compiling and running UML 2.6.[1,2]

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 15:51, sabato 7 febbraio 2004, Dan Shearer ha scritto:
> There's been a few questions on and off-list about this, hopefully this
> will help until there's some tidying up done. The short version is that
> UML on 2.6.[1,2] works quite well, even before Jeff's done a stable
> release. I've probably missed things, please let me know.
>
> These instructions are for those new to UML, not new to kernels and
> distributions. The following might make your system unusable if you
> don't know what you're doingi to a basic level. But enough detail is
> given that if you *are* new to all this you aren't excluded from
> destroying your system in the process of learning.
>
> First, make sure you can compile a standard 2.6.x kernel without any UML
> at all. You may need to upgrade your binutils. gcc 3.2.3 and 3.3.0 is
> known to work.
>
> You can get assorted patch sets for UML 2.6.[1,2] from
> http://user-mode-linux.sourceforge.net/dl-uml-org.html and some a bit
> more recent from http://web.tiscali.it/blaisorblade/index.html. These
> don't quite compile for most people, but with the following twiddles it
> should work:
>
> 1. The default config for um isn't set up correctly. Do 'make menuconfig
> ARCH=um' and uncheck the following, all of which will prevent
> compilation or linking:
>
> 	a) SCSI support / SCSI support
>
> 	b) UML-specific options / Highmem support
Yes, for now it's so.

> 	c) Loadable modules support / Enable loadable module support

> 	d) Security options / Enable different security models

For this two, instead, in my patches 
(http://web.tiscali.it/blaisorblade/index.html, as you quote) there are the 
fixes. However disable CONFIG_MODVERSIONS (that should work, but I don't test 
it heavily + it's useless).

> 3. If you are running a 2.6.x host kernel and your new 2.6.x UML kernel
> appears to hang just after initialising the console driver (eg by all
> measures including commands such as 'uml_mconsole config con0' hanging
> it seems to have stopped) then check to see if you have a NPTL-enabled
> glibc. On RedHat or Debian systems running the 2.6 kernel you probably
> have, and if this is the case UML will not work under any circumstances
> (UML does not use the Native Posix Threading Library but glibc thinks
> it should... see the archives for a sparse description of the problem.)
>
> But never fear! Just recompile your own glibc without NPTL. Under Debian
> this is done by:

Wouldn't be better to suggest renaming /lib/tls to /lib/tls.off, as I've heard 
many times?
Also: check this site: http://uml.harlowhill.com/
that's a Wiki, i.e. anyone can edit it (no HTML-much simpler syntax). If you 
can put this guide in that site, people will probably use it very soon.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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