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   Pull up following revision(s) (requested by manu in ticket #203):

        sys/arch/i386/include/multiboot2.h: revision 1.1
        sys/arch/i386/stand/lib/exec.c: revision 1.74
        sys/arch/i386/stand/efiboot/efiboot.c: revision 1.11
        sys/arch/i386/stand/efiboot/bootia32/multiboot32.S: revision 1.1
        sys/arch/i386/stand/lib/biosdisk.c: revision 1.52
        sys/arch/i386/stand/efiboot/bootx64/efibootx64.c: revision 1.5
        sys/arch/i386/stand/efiboot/eficons.c: revision 1.7
        sys/arch/i386/stand/efiboot/bootia32/efibootia32.c: revision 1.5
        sys/arch/i386/stand/lib/libi386.h: revision 1.45
        sys/arch/i386/stand/lib/bootinfo_memmap.c: revision 1.6
        sys/arch/i386/stand/lib/pread.c: revision 1.8
        sys/arch/i386/stand/efiboot/efiboot.h: revision 1.10
        sys/arch/i386/stand/efiboot/bootia32/Makefile: revision 1.3
        sys/arch/i386/stand/lib/Makefile: revision 1.47
        sys/arch/i386/stand/efiboot/bootx64/Makefile: revision 1.2
        sys/arch/i386/stand/lib/multiboot.S: revision 1.3
        sys/arch/i386/stand/efiboot/bootx64/multiboot64.S: revision 1.1
        sys/arch/i386/stand/efiboot/efimemory.c: revision 1.9
        sys/arch/i386/stand/efiboot/boot.c: revision 1.16
        sys/arch/i386/include/Makefile: revision 1.50
        sys/arch/i386/stand/efiboot/Makefile.efiboot: revision 1.16
        share/man/man8/man8.x86/boot.8: revision 1.20
        sys/arch/i386/stand/boot/Makefile.boot: revision 1.73
        sys/arch/i386/stand/pxeboot/Makefile: revision 1.26
        sys/arch/i386/stand/lib/exec_multiboot1.c: revision 1.1
        sys/arch/i386/stand/netboot/Makefile.netboot: revision 1.11
        sys/arch/i386/stand/lib/exec_multiboot2.c: revision 1.1
        sys/arch/i386/stand/lib/biosdisk.h: revision 1.12
        sys/arch/i386/stand/lib/exec_multiboot2.c: revision 1.2
        sys/arch/i386/stand/dosboot/Makefile: revision 1.32

   Add multiboot 2 support to x86 bootloaders

   multiboot 2 is required to boot Xen on an EFI system.

   This also require a kernel patch for properly discovering
   the ACPI RSDP, which is available after 20190912, in
   src/sys/arch/x86/acpi/acpi_machdep.c 1.26-1.28

   There are a few missing bit in this multiboot 2 implementation
   (which are unused by Xen):
   - Header tags Address, Freambuffer, and Relocatable are ignored
   - Tags APM and Network are not provided
   - Tags ACPI old and ACP new are only provided for ACPI boot
   - Tag boot device does not provides the subpart (BSD disklabel partition)
   Notes:
   - multiboot2 is disabled in dosboot, otherwise the binary
     gets too big and build fails.
   - in src/sys/arch/i386/stand/efiboot, consinit() is renamed
     as efi_consinit() to avoid prototype conflicts in src/sys/sys/systm.h

   Remove debug define.

   It remained there unseen because it was misspelled!

   Remove obsoeolete BUGS note that UEFI bootloader does not support multiboot

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