Problem starting EFI on ESXi 5.5.0 - 1331820-standard

Hello.

Hoping someone can confirm or deny a problem starting EFI on ESXi 5.5.0 - 1331820-standard when you use the start-the name of the DHCP option file (and not the field in BOOTP file).

What I see is that the DHCP boot file name option is not properly interpreted by the EFI ROM: the TFTP request comes back with a broken file name that actually contains not only the file name, but the binary content of the rest of the DHCP packet (or at least the DHCP options area).

Example - if the last two options in the DHCP on the network offer are...

boot file name 'syslinux.efi' # < code: 67 > < length: 12 > syslinux.efi

end # < code: 255 >

.. .the TFTP request comes back with the file name "syslinux.efi\377" (with code 255 end DHCP [= octal 377, here] annexed) instead of "syslinux.efi".

It seems that this can be worked around by (1) using BOOTP instead of DHCP option file field, or (2) by adding an ASCII NUL to the option of starting in the dhcpd configuration file name (i.e. bootfile-name "syslinux.efi\000").

If it is a known problem, has been resolved in a later update of ESXi 5.5 or 6.0 ESXi?

Thank you!

Hi Robert and welcome on VMware communities!

We use the open-source EDK2 as a base project for our implementation of the EFI.  It seems that we will need to enter the following of EDK2 correction so that the name of boot file work properly: EDK II / Code / Commit [r15099]

I doubt that we will have this fixed in ESXi 6.0, so I at this stage I don't think that update will fix it, unfortunately.  I'll report if investigation proves otherwise.

I'll file a bug report to see all have it fixed.  Thanks for the report and troubleshooting comprehensive, you did great problem!

See you soon,.

--

Darius

Tags: VMware

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