Stephen J Smoogen wrote:> OK wild guess on install options as sometimes they will do this but > not say they did it. Try adding inst.gpt=false to the boot line.Sorry, that didn't work. Nor did installing CentOS 7 without a boot loader, chroot-ing into it, and trying to install grub2 manually: grub2-install /dev/sda --target=i386-pc grub2-mkconfig -o /boot/grub2/grub.cfg> Thank you for your patience on this.I didn't realize you were the culprit, so that's OK. ;-) -- Yves Bellefeuille <yan at storm.ca>
On 15 February 2018 at 21:48, Yves Bellefeuille <yan at storm.ca> wrote:> Stephen J Smoogen wrote: > >> OK wild guess on install options as sometimes they will do this but >> not say they did it. Try adding inst.gpt=false to the boot line. > > Sorry, that didn't work. Nor did installing CentOS 7 without a boot > loader, chroot-ing into it, and trying to install grub2 manually: > > grub2-install /dev/sda --target=i386-pc > grub2-mkconfig -o /boot/grub2/grub.cfg >Hmmm if that didn't work then there is something in the bootup which keeps telling grub/kernel you are an EFI only system. EL6 would have installed because EFI support at that point was mainly a "eh oh yeah we need to cover that?" type thing. EL7 should be clearer on this but it might have gone the other way. Can you try to see if Fedora 27 has the same problem? If it has then this is a problem that upstream needs to fix on EL releases. If it isn't then I would lean more towards the motherboard/bios combo saying something which says "my legacy support is iffy.. use EFI". After that it is usually what is the motherboard/bios level and is it updated type fixes then.>> Thank you for your patience on this. > > I didn't realize you were the culprit, so that's OK. ;-) >Well I am not the culprit.. it is just most of my ideas have been completely useless.> -- > Yves Bellefeuille > <yan at storm.ca> > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos-- Stephen J Smoogen.
So is the end goal to have dual boot? You want to preserve the existing Cent OS installation on this drive and also install Cent OS 7? The biggest problem is the installer is really not very smart when it comes to this use case. It's friendly for Windows and macOS dual boot, but fairly well faceplants with dual boot Linux. So invariably you have manual surgery to do pre and post install, or suffer. Run 'efibootmgr' by itself, if you get boot entries the system is definitely UEFI booted. If you get an error, it's legacy/faux-BIOS booted. Certainly legacy boot is the easiest work around, but it can have an effect on various things including drive and video modes that might be different than UEFI booting. e.g. one of my older systems when booting legacy brings up the SSD in IDE mode not SATA, and the system is slower. And it can only use discrete GPU, the integrated GPU is unavailable. So I advise testing before committing to legacy mode. Also, rare, but not all UEFI systems come with a Compatiblity Support Module (fake BIOS), in which case you're stuck. Chris Murphy
Stephen John Smoogen <smooge at gmail.com> wrote:> Can you try to see if Fedora 27 has the same problem? If it has then > this is a problem that upstream needs to fix on EL releases. If it > isn't then I would lean more towards the motherboard/bios combo > saying something which says "my legacy support is iffy.. use EFI".I had no problem installing Fedora 27, so I guess the problem is my system. Oh well. Thanks for the help! -- Yves Bellefeuille <yan at storm.ca>