Bug#719321: debian-installer-launcher: freeze on wrong architecture with no warning

[Tuxicoman <debian@jesuislibre.net>]

Package: debian-installer-launcher
Version: 7.1
Severity: normal

Dear Maintainer,

I tried to install Debian 7.1 on a Asus EEEPC 1005HA through an USB key.
I used the i386-x64 multiarch ISO to create the usb key as adviced on the
Debian website.

I booted on the usb key, the debian installer launch and propose to me to
"install" or "64 bit install". As I was pretty sure it was a 64 bit machine I
used the last option and then nothing happened except black dots drawn on top
of the screen.

I though there was a problem with the usb key, or the way I put the ISO on
it... and finally the solution was, the CPU was only 32bits and by choosing the
first option in debian installer all went well. :-/

So to avoid misleading other people on this king of issue I wonder if it's not
possible to detect the CPU architecture and :
1.  disable the "64bit install" option the CPU can't support it.
or
2. display a warning if the "64bit install" is choosen before going to freeze.


*** Please consider answering these questions, where appropriate ***

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
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-- System Information:
Debian Release: 7.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.2.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash