Secure Boot, though, is designed to add a layer of protection to the pre-boot process. Until late 2012, this has been true of most production EFI implementations, too. By executing before an OS kernel gains control of the computer, malware can "hide out" in ways that aren't possible once an OS has taken over, thus making it virtually impossible for virus scanners to detect the malware-at least, not without rebooting into an emergency system that's not infected.īIOS provides few protections against infection by pre-boot malware in the BIOS boot path, the OS implicitly trusts whatever executes as the boot loader. Although other modes of virus transmission gained prominence as floppies faded in importance and Internet connections became common, pre-boot malware has always had its appeal to malware authors.
Some of the earliest viruses for PCs spread as boot sector viruses: They resided as code in the boot sectors of floppy disks and spread from one computer to another when users booted their computers using infected DOS floppies. In other words, things may have changed! What Is Secure Boot?įor decades, PCs have been plagued by viruses, worms, and other malware. Although Secure Boot is developing less rapidly than it was in late 2012, when I first wrote this page, it's still a dynamic area. This page provides an overview of what Secure Boot is and how the Linux community is responding to it.
By its very nature, though, Secure Boot can also make it harder to boot Linux, particularly on commodity PCs that ship with Windows pre-installed. As the name implies, Secure Boot is intended as a security feature.
In addition to implementing a new boot protocol, UEFI adds a new feature that can improve system security, but that also has the potential to cause a great deal of confusion and trouble: Secure Boot.
I have installed 32bit Windows 8.1 and 10 on EFI using the DVD before without a problem. Windows Setup DVD, presuming architecture match is set, it should work.
If this is the issue, the post should not be made here as Microsoft does not support Grub. The Grub is set to run a specific file and it isn't present or is pathed wrong. Type 4 is possible and more likely to be seen in the Embedded Channel. Example, first run NUCs and some Intel desktop boards were able to boot either architecture in GPT/EFI mode. Type 1 is common for early UEFI 2.3.1 firmware, later replaced by BIOS updates to make thenĦ4bit only. For SFF like tablets or HTPC things like Intel Compute Stick, Type 2 is most common. boot 32bit OS/PE from any interface, boot 64bit OS/PE only from removable device interface (booting 64bit OS/PE from HDD was not allowed)įor your average retail desktop or notebook system, Type 3 is the most common. boot only 64bit OS/PE from any interfaceĤ. boot only 32bit OS/PE from any interfaceģ. boot 32bit or 64bit OS/PE from any interfaceĢ. The settings can be specified to whether or not a specific architecture can be booted from a specific device.įor example, I have used hardware with the following EFI application allowances:ġ. There exist one or the other, or both or combinations depending on the appliance requirements. The Firmware manufacturer can (and usually do) put in blockers to allow a specific architecture to be run. The only other suggestion is to talk to a board manufacture and ask for a 32-bit UEFI firmware.