Currently GRUB does not use the extended memory for itself, since it is used to load an operating system. But we are planning to use it for GRUB itself in the future by lazy loading. Ask okuji for more information.
It is known that (at least) the AMI BIOS in SuperMicro P6SBA motherboard (AMIBIOSC0631) does not return the bitfields correctly.
Which drive is read first depends on your BIOS settings.
This behavior is DOS MBR's, and GRUB ignores the active flag.
But the reason why they decided that 63 means GNU Hurd is not known. Do not use 63 for GNU Hurd.
This is not true. Use 83 for ext2fs even if the owner OS is GNU/Hurd.
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