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Full Discussion: EFI on BSDs problem
Special Forums Hardware Boot Loaders EFI on BSDs problem Post 302462936 by fpmurphy on Friday 15th of October 2010 10:19:48 AM
Old 10-15-2010
EFI loader only supports IA64 currently on FreeBSD. According to the FreeBSD Status report Q1/2010, work on supporting EFI booting on FreeBSD/i386 resumed. The boot loader can now read an ELF file from the EFI FAT partition and they are now working on trying to boot a kernel.

It would seem that what you want to do is not supported OOTB at present.
 

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efi_mkdir(1M)															     efi_mkdir(1M)

NAME
efi_mkdir - make an EFI directory SYNOPSIS
devicefile] dirname DESCRIPTION
makes an EFI directory. The EFI file system is based on the FAT file system and used by the Itanium-based system BIOS to locate an HP-UX bootloader. See efi(4). creates directory dirname in the EFI volume specified by devicefile. If dirname already exists, exits with a diagnostic message, and the directory is not changed. If more than one subdirectory needs to be created to make dirname, exits with a diagnostic message and the directory is not changed, unless the option is specified. dirname should be relative to the root of the EFI volume specified by device- file, not to an HP-UX file system. Options Options can be used singly or combined in any order before the file names. The space between option and argument is optional. devicefile is the device special file of the EFI file system where the directory is to be made. Without the option, uses the device file specified in the environment variable if it is defined. The option overrides the environment variable. Create intermediate directories as necessary. RETURN VALUE
returns exit code 0 if the directory is made successfully. Otherwise it prints a diagnostic message and returns nonzero. 0 Successful completion. >0 Error condition occurred. EXAMPLES
Create directory in device file which contains an EFI file system: Create a directory in device file which contains an EFI file system, when does not exist yet: Create a directory in persistent device file (see intro(7)), which contains an EFI file system, when does not exist yet: AUTHOR
was developed by HP. SEE ALSO
efi_cp(1M), efi_fsinit(1M), efi_ls(1M), efi_rm(1M), efi_rmdir(1M), efi(4), intro(7). Itanium(R)-based Systems Only efi_mkdir(1M)
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