![]() ![]() For example, an SSD block storage device is typically referenced as SDA1, SDA2, and so on in Linux. How Grub and Grub2 Reference Storage Devicesįirst, the original version of Grub references storage devices by their hardware address. But those commonalities are mostly high-level and end there. Both are capable of handling the boot process for multiple OSes, both can auto-load OSes, and both can have a simplified command-line environment-like interface for choosing which OS to boot. ![]() In fact, often the two aren't discernable from the end user’s perspective when the OS loads. ![]() We'll go into more details with that below. This bypassed the memory limitations of the traditional MBR bootloader which allowed things like graphical boot loaders and a multi-OS environment. From there, Grub then references the resources needed to load the OS. Instead of the MBR pointing directly to the resources required to load the OS, those MBR records instead point to the files needed to load Grub. For example, a hard drive is swapped or moved, or a different OS is installed. Each record must be stored in that MBR for the computer to boot properly, and it must be updated manually as system conditions change. That boot record would traditionally hold all the information that tells the computer where and how to access the files to load an operating system (OS). That MBR is small and typically consists of four partitions at 64bytes in size. The MBR is typically stored in the first enumerated primary drive in the system. Bootloaders are installed in the master boot record (MBR) for the computer. To fully understand the difference between Grub and Grub2, we need to understand how bootloaders work. Grub2 has since become the primary bootloader for most major distributions of Linux. Grub2 was designed from the ground-up as a complete rewrite of the original Grub software package to handle more modern requirements. Grub became an official software package for the GNU Project in 1999. It was developed in conjunction with the Free Software Foundation as a method for loading the GNU operating system. The first version of Grub was initially written by Erich Boleyn. In the Linux world, that bootloader is typically Grub or its counterpart, Grub2. Then that BIOS/UEFI hands-off responsibilities to the boot loader to start the OS. First, the BIOS or UEFI is loaded and enumerates the hardware installed in that computer. No matter the computer type, all systems boot in functionally the same way from a high-level perspective. ![]() I saw Proxmox doesn't have a proper hd-media.All operating systems need something called a bootloader that tells the computer how to start up. My question is, would these Debian's hd-media files work also for Proxmox? TL DR, Debian-based distros (at least the *installer* ISOs) have an initrd which doesn't support this loopback feature, seemingly lacking scripts -namely the "iso-scan" program- which would look for the ISO in the partition and the workaround would be downloading initrd from Debian's hd-media (perhaps also the kernel vmlinuz) and load them instead of the ISO's ones. Worked for several distros so far, *but* Debian and its derivatives are an exception because of this: Indeed, I was able to make one such multiboot USB and use it. This also applies for partitions in USB external devices, which in turn can allow making multiboot USBs to boot several Linux distros by just copying the ISO files and using Grub2 to boot them. I learned that Grub2 supports loopback devices, which allow to install Linux distros directly from ISO files placed in some file system partition for example, from an ISO placed in a FAT32 or NTFS hard disk partition. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |