I recently upgraded my /tftpboot/pxelinux.0 file from 3.08 to one from the fc5 syslinux-3.10 package. Since then, some of my systems hang after attempting to perform the "localboot" option. Upgrading to syslinux-3.11 from FC6 fixes this problem. Possible explanation: The release notes for syslinux-3.11 says: "PXELINUX: revert memory allocation change that caused problems on some network cards." Suggested solution: Update the FC5 syslinux package to be the same as the FC6 syslinux package.
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This matter can be closed as far as I'm concerned since it works in FC6.
Thank you for the bug report. This particular bug was fixed upstream. Closing bug as per comment #2. Please feel free to report any further bugs you find.