Starting from Windows 8, everything has changed: INT 10H handler is no longer required by Windows to boot, BIOS emulator and entire VGA miniport driver both are gone, instead Windows basic display driver relies upon UEFI Graphics Output Protocol aka GOP. By the way, Windows 7 and Windows 2008 Server R2 never directly run the INT 10H handler installed by BIOS/CSM, instead they contain an emulator in the VGA miniport driver (VIDEOPRT.SYS) which runs 16-bit BIOS code in a sandbox, without leaving 64-bit protected mode and without halting other CPU cores. What is really important for Windows 7 is a VGA-compatible GPU with properly mapped I/O ports and INT 10H handler (the former depends mostly on the chipset and the latter is usually provided by firmware when CSM mode is enabled in the settings). For example, "bhyve" virtual machine manager in FreeBSD supports 64-bit editions of Windows 7 and Windows 2008 Server R2, despite the complete lack of CSM support. It features the option to create installable clones of existing Windows installations (with optional driver integration and improved preparation of installation media.It's a well-known fact that Windows 7 works best in CSM mode, which, unfortunately, is not supported by the firmware of many modern motherboards and laptops.Ĭontrary to popular belief, it's possible to install Windows 7 圆4 to the pure UEFI systems without CSM support. The commercial version, Called FlashBoot Pro is available for a one-time payment of USD $29.95. The free version supports a handful of other features, including securely wiping data on USB devices, saving the USB drive to an image file or restoring images, and installing DOS. It supports the installation of Windows 8.1 or newer on USB drives, and may also be used to prepare USB drives for the installation of Windows to internal hard drives or Solid State Drives. The free version of FlashBoot, called FlashBoot Free, has a few limitations. Easier installation of older versions of Windows, Windows 7 in particular, on modern AMD and Intel platforms. It can be run independently, but also be used to restore the OS on the main PC.
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