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      • 15. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
        lewisjd99 Novice

        What happened to adding a work around to a future release?

         

        While I understand that this probably isn't as high as fixing runtime issues in priority but for some of us, this is still important in allowing us to run a scripted install that is consistently the same across hundreds of systems which is made more difficult with this flawed implementation that was released...

        • 16. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
          TimMann Enthusiast
          VMware Employees

          Again, the reason that chainloading from EFI GRUB to VMware's bootloader does not work is because of bug(s) in GRUB. It's not because of a "flawed implementation" by VMware.

           

          I did look into this further after my last post. I put a workaround into the VMware bootloader (mboot64.efi) that compensates for the GRUB bug in device path formation. With the workaround, it is possible to chain from GRUB to mboot and boot from local media. The workaround will be included in the upcoming major ESXi release that is in beta now. mboot64 is backward compatible, so it will also be possible to boot older versions of ESXi using the new mboot version.

           

          Unfortunately, though, even with the workaround, chaining from GRUB to mboot64.efi still fails to network boot ESXi successfully. It appears that when chainloading, GRUB calls Stop on the EFI firmware's PXE base code protocol before handing off, so the protocol cannot be used to load the rest of ESXi over the network. I tested this only with GRUB2, so it's possible that it would work with GRUB Legacy, but I doubt it. I tried adding a workaround in mboot that calls Start again on the PXE base code protocol, but that doesn't work -- UEFI firmware apparently can't restart the protocol once it has been stopped.

           

          If you only need to boot ESXi off of local media after chaining from GRUB to mboot, that will work with the new mboot version.

          • 17. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
            continuum Guru
            Community WarriorsUser ModeratorsvExpert

            Hi Tim
            > mboot64 is backward compatible, so it will also be possible to boot older versions of ESXi using the new mboot version.
            Thats very good news.
            You seem to have the missing piece that I needed for a nice but not important project of mine.
            Do you think that using the new mboot64 will allow to create a bootmenu for a LiveDVD that has the following boot options:

            - boot ESXi 3.5 LiveCD

            - boot ESXi 4.0 LiveCD

            - boot ESXi 4.1 LiveCD

            - boot ESXi 5.0 LiveCD

            - boot ESXi 5.1 LiveCD

            - boot ESXi 5.5 LiveCD

            - boot ESXi 6.0 LiveCD
            - boot Ubuntu 64 LiveCD
            - boot CentOS 64 LiveCD
            I had to give up as I had problems with incomptible mboot versions.
            If you ever feel bored  - the most part of the work is already done - a few hours together and we could create a very cool tool for ESXi-administrators


            Regards Ulli

            • 18. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
              lewisjd99 Novice

              Tim,

               

              Unfortunately, PXE/Network install is certainly our preferred method given our current provisioning system.  We have over a thousand hypers spread across 10 physical datacenters, relying on physical media would not be feasible while utilizing alternate methods would require retooling of our provisioning systems...

               

              I can certainly see your point of view regarding it being a "flawed implementation" but perhaps it should be termed a "non-functional implementation", vmware has their published doc regarding PXE implementation for vSphere 6.0 which includes a section for UEFI where I'm not seeing anything stating it doesn't work(I certainly could be missing it but if I am if should be more obvious)...

               

              http://www.vmware.com/files/pdf/vcenter/vsphere-esxi-vcenter-server-60-pxe-boot-esxi.pdf

               

              Perhaps this doc should be edited indicating that that install method doesn't work or perhaps pulling out the UEFI sections altogether...

               

              Otherwise VMware should engineer a functional solution...

              • 19. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
                dariusd Virtuoso
                User ModeratorsVMware Employees

                As far as I'm aware, PXE-booting VMware's mboot.efi directly should work just fine, as documented in the PDF you reference.  Could you explain why that is not an adequate solution for your environment?

                 

                If you choose to use a 3rd-party bootloader such as GRUB, and you encounter difficulties due to a defect in that 3rd-party bootloader, it would not seem to be reasonable cause for us to no longer document the supported configuration of EFI PXE-booting with VMware's own mboot.efi.

                 

                Feel free to provide further explanation if I am missing your point.

                 

                Cheers,

                --

                Darius

                • 20. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
                  TimMann Enthusiast
                  VMware Employees

                  I personally wrote the document that you linked above and personally developed and tested every scenario. We network boot in UEFI mode daily within VMware.

                   

                  The one thing that does not work is chaining to our bootloader from GRUB, due to an issue with GRUB as previously discussed.  Note that the document above does not describe any scenarios that involve chaining from GRUB, only booting mboot64 directly or chaining from ipxe to mboot64.

                   

                  It would be good for us to document the incompatibility with chaining from GRUB. I wasn't aware of it the time I was working on the document. Perhaps a KB article and/or a note in the next rev of the document.

                  • 21. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
                    TimMann Enthusiast
                    VMware Employees

                    ESXi's mboot.c32 and mboot64.efi have similar names to a multiboot plugin that comes with syslinux/pxelinux, but they aren't meant to be general-purpose multiboot standard bootloaders that could boot a Linux kernel.  ESXi started off using the multiboot standard, but we've been slowly making additions (which should be compatible, but aren't tested with anything other than ESXi). So although the newest ESXi mboot should be able to boot old ESXi versions going back quite far (possibly all the way to 3.5, though I haven't personally tested back that far), I would be more surprised if it does boot Linux than if it doesn't.

                    • 22. Re: Has anyone been able to invoke the VMware BOOTX64.efi from a BOOTX64.efi (grub.efi) menu?
                      TusharVaghode Lurker

                      Just like many others in the thread I am switching to UEFI based system ESXi install. The UEFI/mboot.efi worked fine for me.

                       

                      I do have a request for feature though. Currently the default is that it starts installing after 5 seconds of countdown. I was wondering if a menu item can be added where the default is local-disk boot instead - just like all other boot loaders have out there.

                      The way it is right now with mboot.efi/boot.cfg is that there is no protection against someone accidentally hitting F12...  and will result in system getting re-installed.

                       

                      Thanks!

                      -Tushar

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