Grub4dos tutorial - Grub4Dos Wiki
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1 1 de :05 Grub4dos tutorial From Grub4Dos Wiki Contents 1 Introduction 1.1 What is GRUB for DOS 1.2 Difference between GRUB for DOS and GNU GRUB 2 Installation 2.1 Install GRUB for DOS boot code to MBR 2.2 Install GRUB for DOS boot code to partition boot sector 2.3 Starting GRUB for DOS from DOS 2.4 Starting GRUB for DOS from Linux 2.5 Booting GRUB for DOS via the Windows NT/2000/XP/2003 boot manager 2.6 Booting GRUB for DOS via the Windows Vista boot manager 2.7 Loading GRUB for DOS using other boot loader 3 Booting DOS/Windows 9X/Windows NT startup files 4 Disk emulation 4.1 Direct mapping 4.2 Indirect mapping 4.3 Auto MBR creation 4.4 memdisk 5 CDROM related subjects 5.1 Using ATAPI CDROM in GRUB for DOS 5.2 Create a bootable CDROM 5.3 Load GRUB for DOS from BCDW Introduction What is GRUB for DOS GRUB for DOS is an universal boot loader based on GNU GRUB. It can boot off DOS/LINUX, or via Windows boot manager/syslinux/lilo, or from MBR/CD. It also has builtin BIOS disk emulation, ATAPI CDROM driver, etc. Difference between GRUB for DOS and GNU GRUB First of all, GRUB for DOS has a flexible boot loader. Unlike GNU GRUB which relies on three stages of files to boot, GRUB for DOS uses a much better solution. The main function of GRUB is placed in a single file grldr, while the boot loader is placed in another file grldr.mbr, which can be installed to MBR or partition boot sector. At startup, boot code in grldr.mbr will dynamically scan the root directory of every local partition for grldr, and load the first one found. Using this scheme, the location of boot file is no longer fixed, users can move it across partition boundary without causing booting problems. Secondly, GRUB for DOS can be loaded in multiple ways. GRUB for DOS runtime image comes in two forms. One is grldr, which can be loaded by MBR/partition boot sector and the Windows NT/2000/XP/2003/Vista boot manager. It can also act as the eltorito boot file for bootable CDROM. The other is grub.exe, which is a hybrid executable that can be launched from linux console and DOS prompt. Thirdly, GRUB for DOS extends the function of GNU GRUB. The most significant enhancement is the map command. In GRUB for DOS, the map command can be used to create virtual harddisks and floppies from image files. These virtual devices can be accessed even after DOS starts.
2 2 de :05 There are other useful features of GRUB for DOS which are not present in GNU GRUB, such as ATAPI CDROM driver, Chinese support, and so on. Installation There are many ways to install GRUB for DOS. Some of them require modifying MBR or partition boot sector, while others require changing system startup configuration files. Install GRUB for DOS boot code to MBR You can use bootlace.com or grubinst.exe to install GRUB for DOS boot code to MBR: bootlace.com can be used in DOS, Windows 95/98/Me and Linux. Examples: Install GRUB for DOS boot code to the MBR of first hard drive under DOS, Windows 95/98/Me: bootlace 0x80 Install GRUB for DOS boot code to the MBR of IDE channel 0, primary drive under Linux: bootlace /dev/hda Install GRUB for DOS boot code to the MBR of hard drive image file aa.dsk: bootlace aa.dsk grubinst.exe can be used in Linux, FreeBSD and Windows NT family OSs (Windows NT/2000/XP/2003/Vista). Examples: Install GRUB for DOS boot code to the MBR of first hard drive under Windows NT family OSs: grubinst (hd0) Install GRUB for DOS boot code to the MBR of IDE channel 0, primary drive under Linux/FreeBSD: grubinst "(hd0)" You can also use device names: grubinst /dev/hda (Linux) grubinst /dev/ad0 (FreeBSD) Install GRUB for DOS boot code to the MBR of hard drive image file aa.dsk: grubinst aa.dsk There are many options you can use with bootlace and grubinst, use the -h option to display help message. After installing the boot code, you need to copy grldr and menu.lst to the root directory of any FAT16/FAT32/NTFS/EXT2 partition. Install GRUB for DOS boot code to partition boot sector
3 3 de :05 You can use grubinst to install GRUB for DOS boot code to partition boot sector. Examples: Install GRUB for DOS boot code to the first primary partition of the first hard drive: grubinst (hd0,0) or grubinst --install-partition=0 (hd0) or grubinst -p=0 (hd0) Install GRUB for DOS boot code to the first primary partition of the hard drive image file aa.dsk: grubinst --install-partition=0 aa.dsk or grubinst -p=0 aa.dsk Just as in GRUB, extended partition starts with (hd0,4). After installing the boot code, you need to copy grldr and menu.lst to the partition which you install the boot code on. Starting GRUB for DOS from DOS You can use load GRUB for DOS in config.sys using one of the following lines: DEVICE=GRUB.EXE INSTALL=GRUB.EXE SHELL=GRUB.EXE grub.exe can also be launched from DOS prompt or batch file such as AUTOEXEC.BAT. Starting GRUB for DOS from Linux First, you need to apply the kexec patch to the Linux kernel. Then, you can use the following commands to launch GRUB for DOS from linux: kexec -l grub.exe kexec -e Booting GRUB for DOS via the Windows NT/2000/XP/2003 boot manager Add the following line at the end of boot.ini (this file is hidden): C:\grldr="Start GRUB4DOS" Then copy grldr to C:\, and create the GRUB4DOS configuration file at C:\menu.lst. Next time you start windows, there is a new option "Start GRUB4DOS" which can be used to start GRUB for DOS.
4 4 de :05 Booting GRUB for DOS via the Windows Vista boot manager Use bcdedit to configure the startup menu: bcdedit /create /d "Start GRUB4DOS" /application bootsector bcdedit /set {id} device boot bcdedit /set {id} path \grldr.mbr bcdedit /displayorder {id} /addlast Then copy grldr.mbr to C:\, grldr and menu.lst to the root directory of any FAT16/FAT32/NTFS/EXT2 partition. grldr.mbr can also be used to start GRUB for DOS in Windows NT/2000/XP/2003 (in fact, grldr.mbr is basicly the first 16 sectors of grldr). To use grldr.mbr as the boot file, use the following line in boot.ini: C:\grldr.mbr="Start GRUB4DOS" As in Windows Vista, you need to copy grldr and menu.lst to the root directory of any FAT16/FAT32/NTFS/EXT2 partition. Loading GRUB for DOS using other boot loader grub.exe can be loaded as a linux kernel. Load GRUB for DOS using GRUB or another copy of GRUB for DOS, add the following section to menu.lst: title Load GRUB4DOS kernel /grub.exe Load GRUB for DOS using syslinux, add the following section to syslinux.cfg: label GRUB4DOS KERNEL grub.exe Booting DOS/Windows 9X/Windows NT startup files In GRUB for DOS, you can load the DOS/Windows 9X/Windows NT startup files directly. DOS, Windows 95/98/Me: title Load io.sys root (hd0,0) chainloader (hd0,0)/io.sys Windows NT/2000/XP/2003: title Load ntldr root (hd0,0) chainloader (hd0,0)/ntldr Windows Vista: title Load bootmgr root (hd0,0) chainloader (hd0,0)/bootmgr
5 5 de :05 Disk emulation In GRUB for DOS, disk emulation is implemented using the "map" command. Direct mapping Here is an example of mapping a image file as virtual floppy, and boot from it: title Boot from floppy image map (hd0,0)/aa.img (fd0) chainloader (fd0)+1 rootnoverify (fd0) is used to make the mapping created by first map command take effect immediately. Here is an example of booting from the virtual hard disk: title Boot from hard disk image map (hd0,0)/aa.dsk (hd0) map (hd0) (hd1) Map the image file as virtual hard disk, but boot from the original disk: title Create virtual hard disk map (hd0,0)/aa.dsk (hd1) CDROM emulation is not implemented. In direct mapping, the image file must be contiguous. The virtual disk is implemented using INT 13. Therefore, it can be accessed in system that still uses INT 13, such as all kinds of DOS and Windows 9X (compatible mode disk access), and it can't be accessed in system that usesprotected mode drivers, such as Linux, FreeBSD and Windows NT family OSs. Indirect mapping Indirect mapping is very similar to direct mapping, here is an example: title Boot from floppy image map --mem (hd0,0)/aa.img (fd0) chainloader (fd0)+1 rootnoverify (fd0) The --mem option indicates indirect mapping. In indirect mapping, the image file is copy to memory before the mapping is applies, therefore, the image file need not to be contiguous, however, you must have enough memory to hole the image file. Auto MBR creation To create virtual hard disk, you need an image file that resemble a real hard disk, which consist of MBR and partition data. If the image file only contains partition data, you need to patch it with MBR to create disk image. GRUB for DOS has taken this into consideration. When mapping disk image file, it will test the presence of MBR, if not found,
6 6 de :05 it will create MBR automatically using the partition data. For example: title Boot from hard disk image map --mem (hd0,0)/aa.dsk (hd0) map (hd0) (hd1) aa.dsk can be either disk image or partition image, in the later case, GRUB for DOS will create the MBR in the air. memdisk The indirect mapping of GRUB for DOS is similar to the function of external tool memdisk from syslinux. In fact, the following two menu entries do roughly the same thing: title Boot from virtual disk using internal map command map --mem (hd0,0)/aa.dsk (hd0) map (hd0) (hd1) title Boot from virtual disk using external memdisk kernel (hd0,0)/memdisk initrd (hd0,0)/aa.dsk However, memdisk does not support direct mapping or auto MBR creation. CDROM related subjects Using ATAPI CDROM in GRUB for DOS Use the following command to initialize ATAPI CDROM: cdrom --init Then, use the following command to start using ATATPI CDROM: cdrom --hook After cdrom --hook, the CDROM device can be accessed using (cd0), (cd1), etc. To boot from the first CDROM, use the following commands: chainloader (cd0) boot To stop using CDROM: map --unhook cdrom --stop The first command removes the (cdn) device mapping, while the second one stops the CDROM driver. Note: If you boot GRUB for DOS from CDROM, the booting device will be (cd). This device is always accessible.
7 7 de :05 However, if you want to access file from other CDROMs, you still need to initialize them using the above commands. Examples: To boot from the first CDROM: title Boot From First CDROM cdrom --init chainloader (cd0) boot Create a bootable CDROM In GRUB for DOS, you can use grldr to create bootable CDROM: mkisofs -R -b grldr -no-emul-boot -boot-load-seg 0x1000 -o bootable.iso iso_root mkisofs -R -b grldr -no-emul-boot -boot-load-size 4 -o grldr.iso iso_root grldr and menu.lst should be placed at the root directory of CDROM image. The above two commands can both create a bootable CDROM, but they are not totally the same. The first one tells BIOS to load the whole grldr. However, some buggy BIOS might ignore it and load only a portion of the file, typically one sector (2048 bytes). This will cause the program to fail. The second one tells BIOS to load only the first sector (2048 bytes), and the program loads the rest from CDROM. This method is safer, it should work for most BIOS. Note: you can optionally use the -boot-info-table option, but the info table will be ignored by the program. Load GRUB for DOS from BCDW To load GRUB for DOS from BCDW, first copy grldr and menu.lst to the root directory of CDROM image, then add a new line to the [MenuItems] section of BCDW configuration file bcdw.ini: \grldr ; Grub4Dos Retrieved from "" This page was last modified 06:30, 23 July This page has been accessed 11,323 times. Content is available under. Privacy policy About Grub4Dos Wiki Disclaimers
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