in UEFI, CSM module handles MBR+BIOS.
so get the priorities correct in your BIOS settings.
if you are booting windows, you wil want UEFI first, and next failover to CSM.
there are maybe a couple of places to set this, dig around inside. go
spelunking.
>________________________________
> From: Thomas Mueller <mueller6...@twc.com>
>To: freedos-devel@lists.sourceforge.net
>Sent: Wednesday, April 23, 2014 3:33 AM
>Subject: Re: [Freedos-devel] Do not use any code from ms-dos release!
>
>
>
>Excerpt from Rugxulo:
>
>> DOS on modern IBM PC clones have too many hardware compatibility
>> issues: power management, lack of networking (almost no packet
>> drivers), no soundcard drivers (or even static libs), almost no USB
>> support. It doesn't look like most hardware companies care enough to
>> waste time on it. Heck, half the time they don't seem to even properly
>> support Linux. And DJGPP isn't exactly brimming with enthusiastic new
>> users or tons of ports from Linux maintainers either.
>
>> So expecting anything beyond what we've already got is probably naive
>> (sadly). They probably (rightly? hope not!) think that DOS will really
>> disappear once the BIOS is totally replaced by UEFI in all new OEM
>> shipments. I know some people think some partial BIOS compatibility
>> will be available, but I'm very skeptical.
>
>> In other words, it's complicated!
>
>Now I have modern computer hardware, and can't even successfully install
>FreeDOS.
>
>I once succeeded on a 4 GB USB stick, Ativa, twist-turn style, but that went
>bad, actually came apart physically.
>
>This installation could read the header/title of a CD but no more in a SATA
>DVD-RW drive.
>
>I also had a FreeDOS installation on a 341 MB IDE hard drive but can no longer
>read that hard drive, now using Sabrent USB 2.0 enclosure.
>
>I am able to read two other old IDE hard drives in that enclosure.
>
>But there is hope, considering that the FreeDOS image on System Rescue CD
>boots and runs, at least if I use no memory manager.
>
>FreeDOS can read and write to USB drive with FAT16 or FAT32 file system thanks
>to BIOS/UEFI support, but only as a fixed disk: only when in port at boot
>time, and no good when changing USB sticks.
>
>FreeDOS can't read my hard drive because of lack of support for GPT.
>
>I can't access Ethernet or wi-fi through FreeDOS at all, at least not yet. I
>haven't downloaded Glenn McCorkle's March 2013 update of Arachne for DOS.
>Even if I could make the network work in FreeDOS, lack of support for
>Javascript or HTTPS makes Arachne useful just as a curiosity; so many more
>functional browsers available for Linux and BSD.
>
>I wonder about the possibility of making hardware work in FreeDOS through UEFI
>initializing the devices, or Ethernet through PXE boot.
>
>I believe DJGPP is pretty much lame-duck now.
>
>I'd guess that, even with UEFI replacing legacy BIOS, bootable USB sticks with
>MBR partitioning will still be bootable, subject to the underlyimg OS being
>otherwise compatible with the hardware.
>
>Tom
>
>
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