Package: syslinux Version: 3.31-2 Severity: normal Tags: patch Sorry but the 64-bit check I submitted is broken. As per specs in:
http://download.intel.com/design/Xeon/applnots/24161831.pdf Intel is using the same bit as Amd for x86-64 long mode (bit 29 in 0x80000001_edx). However, the code checks for Intel first (and wrong, since it checks for CPUID level being != 0 which is always true for all modern CPUs), and then tests bit 30 in 0x1_edx. According to the Intel spec, bit 30 in 0x1_edx means ia64 support. For Amd [1], bit 30 in 0x1_edx is reserved. In both cases, this means results are undefined. It turns out that the check *did* work for a lot of CPUs, and we didn't find anything wrong in the tests. However, an error could happen in both ways, and detecting 64-bit support where it isn't present can break the debian CDs very badly.. For a fix, see attached patch (relative to patched source). It's NOT tested (I haven't had time, maybe I can do some tests tomorrow). Thanks to Guillem for the assistance in figuring out all this. [1] http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/25481.pdf -- System Information: Debian Release: 4.0 APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.18-3-amd64 Locale: LANG=ca_AD.UTF-8, LC_CTYPE=ca_AD.UTF-8 (charmap=UTF-8) Versions of packages syslinux depends on: ii libc6 2.3.6.ds1-10 GNU C Library: Shared libraries Versions of packages syslinux recommends: ii mtools 3.9.10.ds1-3 Tools for manipulating MSDOS files -- no debconf information -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
