Grub Modules

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  • DevynCJohnson
    DevynCJohnson
    Keymaster
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    • @devyncjohnson

    The GRUB bootloader has many modules that provide extra capabilities (similar to the modules used by Linux). To active/load a GRUB module while in the GRUB command-line (CLI mode), type "insmod MODULE". The modules are typically stored under /boot/grub/i386-pc/ or some similarly name directory. To list the available modules, type "ls /boot/grub/i386-pc/*.mod" (if your system supports that command).

    $ ls /boot/grub/i386-pc/*.mod
    /boot/grub/i386-pc/915resolution.mod
    /boot/grub/i386-pc/acpi.mod
    /boot/grub/i386-pc/adler32.mod
    /boot/grub/i386-pc/affs.mod
    /boot/grub/i386-pc/afs.mod
    /boot/grub/i386-pc/ahci.mod
    /boot/grub/i386-pc/all_video.mod
    /boot/grub/i386-pc/aout.mod
    /boot/grub/i386-pc/archelp.mod
    /boot/grub/i386-pc/ata.mod
    /boot/grub/i386-pc/at_keyboard.mod
    /boot/grub/i386-pc/backtrace.mod
    /boot/grub/i386-pc/bfs.mod
    /boot/grub/i386-pc/biosdisk.mod
    /boot/grub/i386-pc/bitmap.mod
    /boot/grub/i386-pc/bitmap_scale.mod
    /boot/grub/i386-pc/blocklist.mod
    /boot/grub/i386-pc/boot.mod
    /boot/grub/i386-pc/bsd.mod
    /boot/grub/i386-pc/btrfs.mod
    /boot/grub/i386-pc/bufio.mod
    /boot/grub/i386-pc/cat.mod
    /boot/grub/i386-pc/cbfs.mod
    /boot/grub/i386-pc/cbls.mod
    /boot/grub/i386-pc/cbmemc.mod
    /boot/grub/i386-pc/cbtable.mod
    /boot/grub/i386-pc/cbtime.mod
    /boot/grub/i386-pc/chain.mod
    /boot/grub/i386-pc/cmdline_cat_test.mod
    /boot/grub/i386-pc/cmosdump.mod
    /boot/grub/i386-pc/cmostest.mod
    /boot/grub/i386-pc/cmp.mod
    /boot/grub/i386-pc/configfile.mod
    /boot/grub/i386-pc/cpio_be.mod
    /boot/grub/i386-pc/cpio.mod
    /boot/grub/i386-pc/cpuid.mod
    /boot/grub/i386-pc/crc64.mod
    /boot/grub/i386-pc/cryptodisk.mod
    /boot/grub/i386-pc/crypto.mod
    /boot/grub/i386-pc/cs5536.mod
    /boot/grub/i386-pc/datehook.mod
    /boot/grub/i386-pc/date.mod
    /boot/grub/i386-pc/datetime.mod
    /boot/grub/i386-pc/diskfilter.mod
    /boot/grub/i386-pc/disk.mod
    /boot/grub/i386-pc/div_test.mod
    /boot/grub/i386-pc/dm_nv.mod
    /boot/grub/i386-pc/drivemap.mod
    /boot/grub/i386-pc/echo.mod
    /boot/grub/i386-pc/efiemu.mod
    /boot/grub/i386-pc/ehci.mod
    /boot/grub/i386-pc/elf.mod
    /boot/grub/i386-pc/eval.mod
    /boot/grub/i386-pc/exfat.mod
    /boot/grub/i386-pc/exfctest.mod
    /boot/grub/i386-pc/ext2.mod
    /boot/grub/i386-pc/extcmd.mod
    /boot/grub/i386-pc/fat.mod
    /boot/grub/i386-pc/file.mod
    /boot/grub/i386-pc/font.mod
    /boot/grub/i386-pc/freedos.mod
    /boot/grub/i386-pc/fshelp.mod
    /boot/grub/i386-pc/functional_test.mod
    /boot/grub/i386-pc/gcry_arcfour.mod
    /boot/grub/i386-pc/gcry_blowfish.mod
    /boot/grub/i386-pc/gcry_camellia.mod
    /boot/grub/i386-pc/gcry_cast5.mod
    /boot/grub/i386-pc/gcry_crc.mod
    /boot/grub/i386-pc/gcry_des.mod
    /boot/grub/i386-pc/gcry_dsa.mod
    /boot/grub/i386-pc/gcry_idea.mod
    /boot/grub/i386-pc/gcry_md4.mod
    /boot/grub/i386-pc/gcry_md5.mod
    /boot/grub/i386-pc/gcry_rfc2268.mod
    /boot/grub/i386-pc/gcry_rijndael.mod
    /boot/grub/i386-pc/gcry_rmd160.mod
    /boot/grub/i386-pc/gcry_rsa.mod
    /boot/grub/i386-pc/gcry_seed.mod
    /boot/grub/i386-pc/gcry_serpent.mod
    /boot/grub/i386-pc/gcry_sha1.mod
    /boot/grub/i386-pc/gcry_sha256.mod
    /boot/grub/i386-pc/gcry_sha512.mod
    /boot/grub/i386-pc/gcry_tiger.mod
    /boot/grub/i386-pc/gcry_twofish.mod
    /boot/grub/i386-pc/gcry_whirlpool.mod
    /boot/grub/i386-pc/gdb.mod
    /boot/grub/i386-pc/geli.mod
    /boot/grub/i386-pc/gettext.mod
    /boot/grub/i386-pc/gfxmenu.mod
    /boot/grub/i386-pc/gfxterm_background.mod
    /boot/grub/i386-pc/gfxterm_menu.mod
    /boot/grub/i386-pc/gfxterm.mod
    /boot/grub/i386-pc/gptsync.mod
    /boot/grub/i386-pc/gzio.mod
    /boot/grub/i386-pc/halt.mod
    /boot/grub/i386-pc/hashsum.mod
    /boot/grub/i386-pc/hdparm.mod
    /boot/grub/i386-pc/hello.mod
    /boot/grub/i386-pc/help.mod
    /boot/grub/i386-pc/hexdump.mod
    /boot/grub/i386-pc/hfs.mod
    /boot/grub/i386-pc/hfspluscomp.mod
    /boot/grub/i386-pc/hfsplus.mod
    /boot/grub/i386-pc/http.mod
    /boot/grub/i386-pc/hwmatch.mod
    /boot/grub/i386-pc/iorw.mod
    /boot/grub/i386-pc/iso9660.mod
    /boot/grub/i386-pc/jfs.mod
    /boot/grub/i386-pc/jpeg.mod
    /boot/grub/i386-pc/keylayouts.mod
    /boot/grub/i386-pc/keystatus.mod
    /boot/grub/i386-pc/ldm.mod
    /boot/grub/i386-pc/legacycfg.mod
    /boot/grub/i386-pc/legacy_password_test.mod
    /boot/grub/i386-pc/linux16.mod
    /boot/grub/i386-pc/linux.mod
    /boot/grub/i386-pc/loadenv.mod
    /boot/grub/i386-pc/loopback.mod
    /boot/grub/i386-pc/lsacpi.mod
    /boot/grub/i386-pc/lsapm.mod
    /boot/grub/i386-pc/lsmmap.mod
    /boot/grub/i386-pc/ls.mod
    /boot/grub/i386-pc/lspci.mod
    /boot/grub/i386-pc/luks.mod
    /boot/grub/i386-pc/lvm.mod
    /boot/grub/i386-pc/lzopio.mod
    /boot/grub/i386-pc/macbless.mod
    /boot/grub/i386-pc/macho.mod
    /boot/grub/i386-pc/mda_text.mod
    /boot/grub/i386-pc/mdraid09_be.mod
    /boot/grub/i386-pc/mdraid09.mod
    /boot/grub/i386-pc/mdraid1x.mod
    /boot/grub/i386-pc/memdisk.mod
    /boot/grub/i386-pc/memrw.mod
    /boot/grub/i386-pc/minicmd.mod
    /boot/grub/i386-pc/minix2_be.mod
    /boot/grub/i386-pc/minix2.mod
    /boot/grub/i386-pc/minix3_be.mod
    /boot/grub/i386-pc/minix3.mod
    /boot/grub/i386-pc/minix_be.mod
    /boot/grub/i386-pc/minix.mod
    /boot/grub/i386-pc/mmap.mod
    /boot/grub/i386-pc/morse.mod
    /boot/grub/i386-pc/mpi.mod
    /boot/grub/i386-pc/msdospart.mod
    /boot/grub/i386-pc/multiboot2.mod
    /boot/grub/i386-pc/multiboot.mod
    /boot/grub/i386-pc/nativedisk.mod
    /boot/grub/i386-pc/net.mod
    /boot/grub/i386-pc/newc.mod
    /boot/grub/i386-pc/nilfs2.mod
    /boot/grub/i386-pc/normal.mod
    /boot/grub/i386-pc/ntfscomp.mod
    /boot/grub/i386-pc/ntfs.mod
    /boot/grub/i386-pc/ntldr.mod
    /boot/grub/i386-pc/odc.mod
    /boot/grub/i386-pc/offsetio.mod
    /boot/grub/i386-pc/ohci.mod
    /boot/grub/i386-pc/part_acorn.mod
    /boot/grub/i386-pc/part_amiga.mod
    /boot/grub/i386-pc/part_apple.mod
    /boot/grub/i386-pc/part_bsd.mod
    /boot/grub/i386-pc/part_dfly.mod
    /boot/grub/i386-pc/part_dvh.mod
    /boot/grub/i386-pc/part_gpt.mod
    /boot/grub/i386-pc/part_msdos.mod
    /boot/grub/i386-pc/part_plan.mod
    /boot/grub/i386-pc/part_sun.mod
    /boot/grub/i386-pc/part_sunpc.mod
    /boot/grub/i386-pc/parttool.mod
    /boot/grub/i386-pc/password.mod
    /boot/grub/i386-pc/password_pbkdf2.mod
    /boot/grub/i386-pc/pata.mod
    /boot/grub/i386-pc/pbkdf2.mod
    /boot/grub/i386-pc/pbkdf2_test.mod
    /boot/grub/i386-pc/pcidump.mod
    /boot/grub/i386-pc/pci.mod
    /boot/grub/i386-pc/plan9.mod
    /boot/grub/i386-pc/play.mod
    /boot/grub/i386-pc/png.mod
    /boot/grub/i386-pc/priority_queue.mod
    /boot/grub/i386-pc/probe.mod
    /boot/grub/i386-pc/procfs.mod
    /boot/grub/i386-pc/progress.mod
    /boot/grub/i386-pc/pxechain.mod
    /boot/grub/i386-pc/pxe.mod
    /boot/grub/i386-pc/raid5rec.mod
    /boot/grub/i386-pc/raid6rec.mod
    /boot/grub/i386-pc/read.mod
    /boot/grub/i386-pc/reboot.mod
    /boot/grub/i386-pc/regexp.mod
    /boot/grub/i386-pc/reiserfs.mod
    /boot/grub/i386-pc/relocator.mod
    /boot/grub/i386-pc/romfs.mod
    /boot/grub/i386-pc/scsi.mod
    /boot/grub/i386-pc/search_fs_file.mod
    /boot/grub/i386-pc/search_fs_uuid.mod
    /boot/grub/i386-pc/search_label.mod
    /boot/grub/i386-pc/search.mod
    /boot/grub/i386-pc/sendkey.mod
    /boot/grub/i386-pc/serial.mod
    /boot/grub/i386-pc/setjmp.mod
    /boot/grub/i386-pc/setjmp_test.mod
    /boot/grub/i386-pc/setpci.mod
    /boot/grub/i386-pc/sfs.mod
    /boot/grub/i386-pc/signature_test.mod
    /boot/grub/i386-pc/sleep.mod
    /boot/grub/i386-pc/sleep_test.mod
    /boot/grub/i386-pc/spkmodem.mod
    /boot/grub/i386-pc/squash4.mod
    /boot/grub/i386-pc/syslinuxcfg.mod
    /boot/grub/i386-pc/tar.mod
    /boot/grub/i386-pc/terminal.mod
    /boot/grub/i386-pc/terminfo.mod
    /boot/grub/i386-pc/test_blockarg.mod
    /boot/grub/i386-pc/testload.mod
    /boot/grub/i386-pc/test.mod
    /boot/grub/i386-pc/testspeed.mod
    /boot/grub/i386-pc/tftp.mod
    /boot/grub/i386-pc/tga.mod
    /boot/grub/i386-pc/time.mod
    /boot/grub/i386-pc/trig.mod
    /boot/grub/i386-pc/tr.mod
    /boot/grub/i386-pc/truecrypt.mod
    /boot/grub/i386-pc/true.mod
    /boot/grub/i386-pc/udf.mod
    /boot/grub/i386-pc/ufs1_be.mod
    /boot/grub/i386-pc/ufs1.mod
    /boot/grub/i386-pc/ufs2.mod
    /boot/grub/i386-pc/uhci.mod
    /boot/grub/i386-pc/usb_keyboard.mod
    /boot/grub/i386-pc/usb.mod
    /boot/grub/i386-pc/usbms.mod
    /boot/grub/i386-pc/usbserial_common.mod
    /boot/grub/i386-pc/usbserial_ftdi.mod
    /boot/grub/i386-pc/usbserial_pl2303.mod
    /boot/grub/i386-pc/usbserial_usbdebug.mod
    /boot/grub/i386-pc/usbtest.mod
    /boot/grub/i386-pc/vbe.mod
    /boot/grub/i386-pc/verify.mod
    /boot/grub/i386-pc/vga.mod
    /boot/grub/i386-pc/vga_text.mod
    /boot/grub/i386-pc/video_bochs.mod
    /boot/grub/i386-pc/video_cirrus.mod
    /boot/grub/i386-pc/video_colors.mod
    /boot/grub/i386-pc/video_fb.mod
    /boot/grub/i386-pc/videoinfo.mod
    /boot/grub/i386-pc/video.mod
    /boot/grub/i386-pc/videotest_checksum.mod
    /boot/grub/i386-pc/videotest.mod
    /boot/grub/i386-pc/xfs.mod
    /boot/grub/i386-pc/xnu.mod
    /boot/grub/i386-pc/xnu_uuid.mod
    /boot/grub/i386-pc/xnu_uuid_test.mod
    /boot/grub/i386-pc/xzio.mod
    /boot/grub/i386-pc/zfscrypt.mod
    /boot/grub/i386-pc/zfsinfo.mod
    /boot/grub/i386-pc/zfs.mod

    • 915resolution - This module is used to change the video resolution.
    • acpi - Advanced Configuration and Power Interface (ACPI) is used to perform various power-related functions.
    • adler32 - This is a cryptography module that contains the tools needed to use the Adler-32 checksum.
    • affs - Support for the AFFS filesystem is provided by this module.
    • afs - Support for the AFS filesystem is provided by this module.
    • ahci - AHCI stands for "Advanced Host Controller Interface" and this is a special hard-drive format (like IDE or SATA). This module offers the needed code for GRUB to recognize such devices.
    • all_video - Additional video and graphics support can be gained when the "all_video" module is loaded.
    • ata - This module provides support for ATA computer buses.
    • at_keyboard - This module is used to support the 84-key keyboards.
    • backtrace - This module gets the list of functions that are running in an active thread.
    • bfs - This module provides support for the Be FileSystem which is used by BeOS.
    • biosdisk - This module provides GRUB with the ability to boot off of LiveDisks.
    • blocklist - This module displays the list of blocks used by the specified file.
    • bsd - This module provides support for loading BSD kernels.
    • btrfs - This module provides support for the B-tree Filesystem.
    • bufio - This module supports buffer reads and writes.
    • cat - The "cat" command is provided by this module.
    • cbfs - This module provides GRUB with support for the Callback Filesystem (CBFS).
    • cbls - This module lists the coreboot tables.
    • cbmemc - This module displays the contents of the CBMEM console.
    • cbtable - This module provides support for Coreboot tables.
    • chain - This module offers chainloading capabilities.
    • cmosdump - This command displays the raw CMOS data.
    • cmp - The "cmp" command is provided by this module.
    • configfile - This module provides the ability to read and manipulate configuration files.
    • cpio_be - This module provides support for big-endian CPIO.
    • cpio - This module provides support for CPIO.
    • cpuid - This modules tests for various CPU features.
    • crc64 - This module offers an error-detection tool known as Cyclic Redundancy Check (CRC).
    • cryptodisk - This module is needed to mount a crypto disk.
    • date - This module provides the "date" command.
    • datetime - This module provides the "datetime" command.
    • diskfilter - This module is needed to read RAID arrays.
    • disk - This module is needed to read hard-drives.
    • drivemap - This module contains functions related to BIOS drive mappings.
    • echo - This module provides the "echo" command.
    • efiemu - This module provides EFI emulation features.
    • ehci - This module provides support for the Enhanced Host Controller Interface (EHCI) which is used by USBv2.
    • elf - This module loads ELF files.
    • eval - This module provides the "eval" command which is used to evaluate expressions.
    • exfat - GRUB can gain support for FAT64 (also called exFAT) with this module.
    • ext2 - This module provides support for EXT2 filesystems.
    • fat - GRUB can gain support for the FAT filesystem with this module.
    • file - This module provides the basic file I/O functions.
    • font - This module provides many font-related functions.
    • freedos - This module contains the code needed to boot FreeDOS.
    • fshelp - This module contains functions related to filesystem-helpers.
    • gcry_arcfour - This module provides support for the ARC4 cryptography tool.
    • NOTE: "gcry_*" modules are GRUB Cryptography tools.
    • gcry_blowfish - This module provides support for the Blowfish cryptography tool.
    • gcry_camellia - This module provides support for the Camellia cryptography tool.
    • gcry_cast5 - This module provides support for the CAST-128 (also called CAST5) cryptography tool.
    • gcry_crc - This module provides support for the hash functions needed by Cyclic Redundancy Check utility.
    • gcry_des - This module provides support for the Data Encryption Standard (DES) algorithm.
    • gcry_dsa - This module provides support for the Digital Signature Algorithm (DSA) cryptography tool.
    • gcry_idea - This module provides support for the International Data Encryption Algorithm (IDEA) cryptography tool.
    • gcry_md4 - This module provides support for the MD4 checksum utility.
    • gcry_md5 - This module provides support for the MD5 checksum utility.
    • gcry_rfc2268 - This module provides support for the RFC2268 cryptography tool.
    • gcry_rijndael - This module provides support for the Rijndael encryption algorithm cryptography tool (which is similar to DES).
    • gcry_rsa - This module provides support for the RSA cryptography tool.
    • gcry_seed - This module provides support for the SEED (block cypher) cryptography tool.
    • gcry_serpent - This module provides support for the Serpent (a symmetric key block cipher) cryptography tool.
    • gcry_sha1 - This module provides support for the SHA1 checksum utility.
    • gcry_sha256 - This module provides support for the SHA256 checksum utility.
    • gcry_sha512 - This module provides support for the SHA512 checksum utility.
    • gcry_tiger - This module provides support for the Tiger (hash function) cryptography tool.
    • gcry_twofish - This module provides support for the Twofish (a symmetric key block cipher) cryptography tool.
    • gcry_whirlpool - This module provides support for the Whirlpool (hash function) cryptography tool.
    • gdb - This module contains features related to the GNU Debugger (GDB).
    • geli - This module provides a block device-layer disk encryption system for FreeBSD.
    • gettext - This module provides language translation abilities.
    • gfxmenu - This module provides the gfxmenu.
    • gptsync - A GPT partition table can be synced with an MBR partition table using this module.
    • gzio - This module offers Gzip I/O abilities.
    • halt - This module provides the "halt" command.
    • hashsum - This module provides the features needed to compute and check hash checksums.
    • hdparm - GRUB can use this module to set and get ATA parameters.
    • hello - This module is an "Hello World" example for making GRUB modules.
    • help - This module provides the help utility.
    • hexdump - This module offers hex dump capabilities.
    • hfs - GRUB uses this module to gain support for the HFS filesystem.
    • hfspluscomp - HFS+ compression is supported with this module.
    • hfsplus - GRUB uses this module to gain support for the HFS+ filesystem.
    • http - GRUB can boot systems that reside on a Network Filesystem (NFS). This means that GRUB may need some networking capabilities sometimes. The "http" module provides the Hyper Text Transfer Protocol.
    • hwmatch - Blacklists and whitelists for hardware are used with this module.
    • iorw - This module is used to read and write the input and output of devices..
    • iso9660 - This module offers iso9660 support which is needed to read optical discs that use this filesystem.
    • jfs - GRUB uses this module to gain support for the JFS filesystem.
    • jpeg - GRUB can have background images (like a wallpaper). The "jpeg" module provides support for JPEG images, which GRUB can use as a background image.
    • keylayouts - The keyboard layout can be changed using this module.
    • keystatus - By using the keystatus module, GRUB can detect whether or not key modifiers are active (such as caps-lock, shift, ctrl, etc.).
    • ldm - The LDM module offers support for the LDM partitioning layout (Microsoft's Logical Disk Manager).
    • legacycfg - Backwards compatibility for various GRUB Legacy features are provided with this module.
    • legacy_password_test - This module is used to test the legacy password system.
    • linux16 - The "linux16" command is in this module. The command is used to load a 16-bit Linux system.
    • linux - This module is just like the "linux16" module except that this is the standard "linux" command.
    • loadenv - This module provides the "loadenv" command which is used to load variables from the environment block file.
    • loopback - The "loopback" command comes from the "loopback" module. "loopback" provides the tools needed to create loopback devices.
    • lsacpi - This module is used to list the detected ACPI devices.
    • lsapm - This module lists Advanced Power Management (APM) devices. APM is the predessor to ACPI.
    • lsmmap - This module displays the memory map (LiSt Memory Map).
    • ls - This module provides GRUB with the "ls" command which is used to list devices or files.
    • lspci - This module provides the "lspci" command which is used to list PCI devices.
    • luks - Linux Unified Key Setup (LUKS) is a special disk-encryption format used by Linux systems. With this driver, GRUB can access LUKS partitions with this module.
    • lvm - This module offers GRUB support for Linux's Logical Volume Manager (LVM).
    • lzopio - This module provides support for reading and writing (I/O) files that are compressed with lzop. "lzop" is similar to Gzip and uses the LZO compression library.
    • macbless - With this module, GRUB can "bless" a file or directory that resides on an HFS or HFS+ filesystem. To "bless" a file means to make it bootable and set various options related to startup.
    • macho - Mach-O files cannot be loaded without using this module. A Mach-O file is a Mach Object file format that has replaced the "a.out" file format.
    • mda_text - This driver provides text support for MDA (Monochrome Display Adapter) as opposed to VGA.
    • mdraid09_be - RAID support with big-endian is given to GRUB via this module.
    • mdraid09 - RAID support is given to GRUB via this module.
    • mdraid1x - RAID1 support is offered with this module.
    • memdisk - This module provides GRUB a way to boot old operating systems (like from floppy drives). http://www.syslinux.org/wiki/index.php/MEMDISK
    • memrw - GRUB uses this module to read and write to physical memory.
    • minicmd - The commands that are available in rescue mode come from this module.
    • minix2_be - Support for MinixFS v2 with big-endian is provided by this module.
    • minix2 - Support for MinixFS v2 without big-endian is provided by this module.
    • minix3_be - Support for MinixFS v3 with big-endian is provided by this module.
    • minix3 - Support for MinixFS v3 without big-endian is provided by this module.
    • minix_be - Support for MinixFS v1 with big-endian is provided by this module.
    • minix - General support for Minix filesystems is offered by this module.
    • mmap - This module provides the needed code for memory mapping.
    • morse - GRUB can provide information via Morse Code when this module is loaded.
    • mpi - GRUB can support the Message Passing Interface (MPI) which is commonly seen on clusters.
    • msdospart - Support for MS-DOS partitions (commonly called "MBR partitions") is provided by this module.
    • multiboot2 - This module provides various functions needed to support multi-booting systems (just like the "multiboot" system). However, this module provides additional and newer features.
    • multiboot - This module provides various functions needed to support multi-booting systems.
    • named-colors - This module is a library that contains various color names with the RGB values for that color.
    • nativedisk - This module makes GRUB use native disk drivers such as pata, ahci, usbms, ohci, uhci, and ehci.
    • net - Many network drivers and functions are contained in this module. GRUB is able to boot from remote hard-drives via the network.
    • newc - NewC is a special CPIO format. This module provides a way for GRUB to access such CPIO files.
    • nilfs2 - This module provides support for NILFS2 (New Implementation of Log filesystem v2).
    • normal - This module provides "Normal Mode" which is the opposite of "Rescue Mode".
    • ntfscomp - GRUB is able to support the compression commonly used in NTFS with this module.
    • ntfs - GRUB uses this module to gain support for the NTFS filesystem.
    • ntldr - This module is based on the "chainloader" module and is used to boot a Windows partition. This module does not read the Volume Boot Record. This is helpful in cases when the Volume Boot Record is corrupted.
    • odc - This module provides support for a special CPIO format known as "Octet-oriented cpio format".
    • ohci - Open Host Controller Interface (OHCI) is a hardware standard commonly used by FireWire devices.
    • part_acorn - This module provides support for Acorn partitions and partitioning tables.
    • part_amiga - This module provides support for Amiga partitions and partitioning tables.
    • part_apple - This module provides support for Apple partitions and partitioning tables.
    • part_bsd - This module provides support for BSD partitions and partitioning tables.
    • part_dfly - This module provides support for DFLY partitions and partitioning tables.
    • part_dvh - This module provides support for DVH partitions and partitioning tables.
    • part_gpt - This module provides support for GPT (GUID Partition Table) partitions and partitioning tables.
    • part_msdos - This module provides support for MS-DOS (MBR) partitions and partitioning tables.
    • part_plan - This module provides support for Plan9 partitions and partitioning tables.
    • part_sun - This module provides support for Sun partitions and partitioning tables.
    • part_sunpc - This module provides support for SunPC partitions and partitioning tables.
    • parttool - This module provides the "parttool" command.
    • password - This module provides the "password" command.
    • pata - Support for the Parallel ATA (PATA) disk interface is provided by this module.
    • pbkdf2 - This module provides the PBKDF2 (Password-Based Key Derivation Function 2) cryptography tool.
    • pcidump - This module provides information on the detected PCI devices.
    • pci - This module provides support for Peripheral Component Interconnect (PCI) computer buses.
    • plan9 - This module is needed by GRUB to load Plan9 kernels.
    • play - This module provides the "play" command which is used to play sound via the BIOS speaker.
    • png - PNG files can be used as the background image when this module is loaded.
    • probe - This module is used to probe for device information.
    • procfs - This module provides support for ProcFS.
    • progress - This module provides a progress bar.
    • pxechain - This module supports PXE chainloading.
    • pxe - GRUB uses this module to gain support for Preboot eXecution Environment (PXE). This is used to boot an operating system independently of local storage units.
    • raid5rec - This module provides RAID5 support.
    • raid6rec - This module provides RAID6 support.
    • read - This module provides the "read" command.
    • reboot - This module provides the "reboot" command.
    • regexp - Regular Expressions (REGEX wildcards) are supported via this module.
    • reiserfs - This module provides support for the Reiser Filesystem.
    • romfs - This module provides RomFS support.
    • scsi - This module provides support for the SCSI (Small Computer System Interface) hardware protocols and standards.
    • sendkey - This module provides the "sendkey" command which is used to send emulated key-presses to GRUB.
    • serial - This module provides support for serial devices.
    • setjmp - This module is a library that provides support for non-local jumps. This is needed to manage errors and interrupts.
    • setpci - This module is used to configure PCI devices.
    • sfs - Support for the Smart Filesystem (SFS) is offered by this module. SFS is a journaling filesystem used by Amiga systems.
    • sleep - The "sleep" command is provided by this module. The "sleep" command is just like the one in BASH; execution will wait/pause for the specified time.
    • sleep_test - This module is used to test for proper "sleep" support.
    • spkmodem - This module is a generic speaker driver for GRUB. Enabling this feature can slow down the booting process.
    • spkmodem-recv - This module decodes spkmodem signals.
    • squash4 - GRUB can access Squash Filesystem with this module. SquashFS is a read-only filesystem that is compressed.
    • syslinuxcfg - GRUB can support SysLinux configuration files with this module.
    • tar - Support for Tar files is offered with this module.
    • terminal - This module provides support for terminals.
    • terminfo - GRUB can read terminfo entries via this module.
    • testload - GRUB can load a file multiple ways to test for errors.
    • test - This module provides the "test" command which is used to evaluate an expression.
    • testspeed - GRUB's fle reading speed can be measured with this module.
    • tftp - Trivial File Transfer Protocol (TFTP) provides GRUB a way to get files needed for booting from another system. This also provides a way to support diskless booting.
    • tga - This module offers support for the Tandy Graphics Adapter (TGA) which is a technology similar to VGA.
    • time - This module provides the "time" command which prints the current time.
    • trig - This module provides trigonometric functions to GRUB.
    • tr - The "tr" command is provided by this module. This is the same "tr" command as seen in BASH and other shells.
    • truecrypt - Truecrypted MBR partitions require that this module be loaded so that GRUB can boot such partitions. TrueCrypt is an on-the-fly-encryption (OTFE) utility for files or partitions.
    • true - This module provides the boolean commands "true" and "false".
    • udf - The "udf" module provides support for the Universal Disk Format (UDF).
    • ufs1_be - Support for the Unix Filesystem v1 with big-endian is provided with this module.
    • ufs1 - Support for the Unix Filesystem v1 is provided with this module.
    • ufs2 - Support for the Unix Filesystem v2 is provided with this module.
    • uhci - This module provides support for the Universal Host Controller Interface (UHCI).
    • usb_keyboard - USB keyboards are supported with this module.
    • usb - USB devices in general are supported with the "usb" module.
    • usbms - USB mice are supported by this module that offers features needed for USB data streams.
    • usbtest - USB support is tested with this module.
    • vbe - VESA BIOS Extensions (VBE) is a specific VESA standard that this module supports.
    • verify - File signatures can be verified using the "verify" module.
    • vga - This module provides VGA support.
    • vga_text - This module provides the text-only (VGA) mode.
    • video_bochs - This module provides the Bochs video driver.
    • video_cirrus - This module provides the Cirrus video driver.
    • video_colors - Many functions related to color come from this module.
    • video_fb - This module is for the video framebuffer.
    • videoinfo - Various information concerning the graphics can be displayed using the tools that are part of the "videoinfo" module.
    • video - This provides code needed for various video modes.
    • videotest - The video settings can be tested using this module.
    • xfs - GRUB uses this module to gain support for the XFS filesystem.
    • xnu - This module provides support for XNU kernels (like OS X).
    • xnu_uuid - This module converts the 64-bit UUIDs to the 128-bit UUIDs used by Xnu kernels.
    • xnu_uuid_test - This module is used to ensure that two 128-bit UUIDs match.
    • xzio - This module provides read and write support for xz-compressed files.
    • zfscrypt - Encryption tools for the ZFS filesystem are in this module.
    • zfsinfo - This module displays various information about a ZFS filesystem/partition.
    • zfs - GRUB uses this module to gain support for the ZFS filesystem.

    Many other modules exist, but these are some of the most common ones.

    Further Reading

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