Hello, all. Some new stuff in experimental. Filesystems don't really
need any comment.
ata.mod was splitted into ata.mod and pata.mod since AHCI uses ATA too.
So now it's --disk-module=(pata|ahci|native) where native is a special
keyword to include all native disk drivers and dependencies (ahci, pata,
uhci,ohci, usbms currently). To switch from biosdisk to ahci "on the fly":
insmod ahci
prefix=(ahciX,Y)/Z
Example of freedos booting:
menuentry "Freedos" {
   root=hd0,msdos1
   freedos /kernel.sys
}
Example of plan9 loading:
menuentry "Plan9" {
          root=hd0,msdos1,plan1
          plan9 -m hd0=sdC0 /9pcf 'bootargs=local!#S/sdC0/fossil'
'bootdisk=local!#S/sdC0/fossil' '*nodumpstack=1' '*nomp=1' 'dmamode=ask'
'partition=new' 'mouseport=ps2' 'monitor=xga' 'vgasize=640x480x8'
}
Both Plan9 and FreeDos use BIOS calls so they are restricted to i386-pc.
Both boot protocols are archaic and don't even include a way to pass
memory map.

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