On the 16th of June 2019, 22:28, Thomas Mueller wrote: > Excerpt from userbeit...@abwesend.de: > >> * UEFI replaced the BIOS. >> * FreeDOS needs a PC with BIOS. >> * UEFI, in its transitional period, supported emulating the BIOS, which >> it calls CSM. >> * CSM stands for "compatiblity support module" and is essentially the >> BIOS emulation of UEFI. >> * Modern operating systems are UEFI only. > That last statement is not true! > > Linux, FreeBSD, NetBSD, OpenBSD and Haiku can boot from BIOS, although UEFI > support is improving. > > I believe MS-Windows 10 is UEFI-only. MacOS is designed to run specifically > on Apple-designed computers as opposed to a computer that can run Windows.
Sorry, you're right off course. Though on my Linux machine the graphics works flawlessly when booted in native UEFI mode, but has issues with screen suspend (monitor in stand-by) - it doesn't wake-up from stand-by, monitor-wise – when booted in CSM/BIOS mode. Essentially the drivers seem to be well tested under UEFI but not so well using the good old BIOS. With machines going to exclusively native UEFI, without CSM, this will be more and more the case, leaving the BIOS mode less stable for certain configurations. Older machines with a native BIOS, and thus without UEFI, will most likely continue to work with most of the hardware they support anyhow. On Linux... What we already see is that most Linux distributions become x64=amd64 exclusively. There are ways to get x86 versions, but not as trivial as it used to be. E.g. Ubuntu has stopped supplying a full 32-bit installation image, only the netinst image continues to be available for x86. For now. Windows 10 is both BIOS and UEFI capable. It could be that the 32-Bit version of Windows 10 is BIOS-only, but the 64-Bit version runs in BIOS mode on my Mac, using the CSM provided with the BootCamp setup. The difference is that with UEFI you'll have to use GPT as the partitioning of the boot drive and with BIOS you'll have to use MBR. On a Mac this is done using a hybrid GPT/MBR, which limits the number of partitions to 2 (actually its 4, but with one being the ESP and one being the macOS restore partition you're left with only 2 more: one for macOS and one for Windows). There are ways around this though, also a native Apple-EFI installation of Windows 10 is possible. And for macOS: there was a time when you could restore the operating system on an MBR partition and boot it (on a Mac). Also it was possible to use the Apple Partition Map, which was used on PowerPC-based Macs, available until 2005. Only, it is not possible to _install_ macOS on any other partition than GPT on an Intel-Mac. But that's off-topic... When Mac OS X Tiger was ported to x86 it was initially possible to boot it in BIOS mode. macOS itself is a great operating system in this regard, but Apple put a lot of energy in closing it down, more and more with every version, and soon no tweaking in any direction will be possible... Cheers, A. _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
