Hello. Currently mbi contains a lot of pointers and substructures. It's
has various problems like:
-Unused fields occupy space if any subsequent fields is used.
-Difficult to relocate since it may be spilled all over the memory
-It's unstraightforward to e.g. specify 2 framebuffers
I propose to use tagged MBI. I attach proposed patch for multiboot and
grub2. Patch for grub2 is based on my efiboot branch
The patched branches are available under people/phcoder/mbtag-spec and
people/phcoder/taggedmbi.
The parts for which I haven't defined tagged equivalent yet:
-Symbols
-ROM information table
-Drives table
-APM table

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko