On 2013-11-24 11:13, roland aus köln wrote: > i did a comparison of the installer`s kernel .config with the kernel > .config of my working system - and they appear nearly identical: > > 3c3 > < # Linux/i386 3.11.0-12-generic Kernel Configuration > --- >> # Linux/i386 3.11.0-13-generic Kernel Configuration > 68c68 > < CONFIG_VERSION_SIGNATURE="Ubuntu 3.11.0-12.19-generic 3.11.3" > --- >> CONFIG_VERSION_SIGNATURE="Ubuntu 3.11.0-13.20-generic 3.11.6" > 5435c5435 > < CONFIG_USB_OTG=y > --- >> # CONFIG_USB_OTG is not set > 5703d5702 > < CONFIG_USB_ZERO_HNPTEST=y > 6717a6717 >> CONFIG_DM_RAID45=m > > so i would confirm the suspicion that the problem must be related to the > bootloader somehow. > > but the question is if syslinux makes the kernel fail boot or if grub > has something "inside" which avoids the kernel fail to boot. > > if PAE cpu flag is not available in some processor`s CPUID, i wonder why > the kernel can boot. does linux kernel not check for cpu flags and does > it detect pae capability differently (i.e. more reliable?) > The flag is only an indicator, that is used by other programs to decide what to do. Most Celeron M and Pentium M computers have PAE capability, at least they can manage to run PAE kernels without problems. But there is no PAE flag.
There are at least two checks, - in syslinux that prevents installation if there is no PAE flag - in the system for upgrading, that prevents upgrading to a new kernel. I guess more precisely it prevents upgrading to a PAE kernel, if there is no PAE flag. But there is no check in grub, so that way we can boot the kernel. -o- If you have the time and insight to fix these issues, we are many people who would be happy :-) Best regards Nio -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/930447 Title: Unable to start Ubuntu 12.04 live CD with syslinux loader on Pentium M x86 Laptop due to bug in PAE kernel, initramfs or syslinux To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/syslinux/+bug/930447/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
