Messages in this thread |  | | Date | Fri, 28 Feb 2003 17:54:45 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: emm386 hangs when booting from linux |
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On Fri, 28 Feb 2003, H.Rosmanith (Kernel Mailing List) wrote:
> > hello, > > for some reason, I am using the "switch to 16 bit realmode" function > present in the linux kernel to execute various 16bit code. One thing > that I am doing is to read the mbr off a harddisk to 0x7c00 and then > jump to there. This allows to e.g. "quickboot dos" from linux without > having to go through bios startup. > > I got this working with *one* exception: as soon as I load emm386 > in config.sys, the system hangs. It doesn't hang completely, e.g. > the num-lock led changes light when pressing num-lock, and ctrlaltdel > reboots the system. When I "REM"ark the emm386.exe, then dos will > boot and display a "C:\>" prompt.
So you are trying a "home-brew" DOS-EMU which already exists and works well. emm386.exe attempts to go to protected mode. That's how it works. That's how it's able to make "high-RAM" appear in "low-RAM" windows for the emm386 specification. Of course it will fail when you are in virtual 386 mode. The real DOS-EMU emulates the extended/expanded memory specification so you don't need this in 'config.sys'. I sometimes boot real DOS usinf DOS-EMU and it works fine. You need to configure it so it will look at, say config.emu, instead of the DOS config.sys. That way, you can keep boot-specific configuration files.
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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