[maemo-developers] Correction to Maemo 4.01 installation instruction

[From: Janne Johansson]

On pe, 2008-06-06 at 10:09 +0300, ext Wellu Mäkinen wrote:
> installation instructions at http://tablets-dev.nokia.com/4.0.1/INSTALL.txt 
> seem to be updated to reflect few problems that are present at least in 
> Ubuntu systems.

That's what happened. The installers received some additional checks
also.

> There is one caveat though which should be clearly noted:
> 
> "2.3 Known limitation of scratchbox" states that e.g Ubuntu Hardy users should 
> disable vdso and also lower the mmap_min_addr. The problem is that 
> mmap_min_addr is only present in very recent kernels. If this is set in 
> earlier kernels they simply die during boot.
> 
> Ubuntu Hardy is ok with this but Gutsy gets nuked if you set this in the 
> sysctl.conf.

Actually, we couldn't reproduce this problem with Ubuntu Gutsy. We tried
it with a fresh install and one upgraded to the latest versions. If the
mmap_min_addr wasn't supported by the kernel, it just got ignored.
However we found that the vdso_enabled had a default value 2 and
changing it to anything else caused the kernel to hang completely. 

> So, please add a warning or note that people just don't blindly set these in 
> their sysctl.conf.

Warning has now been added. Thanks for the feedback :)

-- 
Janne Johansson <ext-janne.p.johansson at nokia.com>