The patches for this have been merged in master. This can be resolved.

For many use cases, it's extremely useful to be able to extract information out of SMBIOS. This is especially valueable in network boot situations, and a feature pxelinux/syslinux, iPXE etc. support.

David Michael has gone through the trouble and actually wrote such a module, and made it work both under both BIOS and EFI.

Apparently, he has also completed the FSF copyright assignment, and has tried to push this upstream almost on a yearly basis since 2013(!):
http://lists.gnu.org/archive/html/grub-devel/2013-04/msg00153.html
http://lists.gnu.org/archive/html/help-grub/2014-07/msg00012.html
https://lists.gnu.org/archive/html/help-grub/2015-01/msg00049.html
https://lists.gnu.org/archive/html/grub-devel/2016-04/msg00020.html
https://lists.gnu.org/archive/html/grub-devel/2017-05/msg00028.html

A lot of different people have responded too, and claimed they're using them in production, so I'd argue that they are quite well tested by now. The diffstat looks like this:
 docs/grub.texi                       | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 grub-core/Makefile.core.def          | 15 +++++++++++++++
 grub-core/commands/efi/lsefisystab.c |  1 +
 grub-core/efiemu/i386/pc/cfgtables.c | 15 ++++-----------
 include/grub/efi/api.h               |  5 +++++
 5 files changed, 100 insertions(+), 11 deletions(-)

It seems like the patches still apply to 2.04, but if a rebase is required, either David or I can rebase and submit. Would it be possible to merge this? Thanks!