Re: Serial port slow on Linux dosemu

[Mark Hounschell <markh@compro.net>]

On 01/10/2012 11:20 AM, Mark Hounschell wrote:
> On 01/10/2012 10:47 AM, Paul Crawford wrote:
>>> When using the 2 config entries below "and" the -s option "as root" the
>>> serial port speeds up to almost what it should be. It now takes 2
>>> seconds to test the cable. That is good however, using the -s option
>>> seems to force some sort of full screen and the "ega" graphics is then
>>> broken. Without the -s option my window is as I define it in the config
>>> file and "ega" graphics works OK.
>>>
>>>
>>> $_ports = " device /dev/null range 0x3f8 0x3ff fast"
>>> # $_com1 = "/dev/ttyS0"
>>>
>>> Please help
>>
>> If you attempt to get direct hardware access to any of the PC's I/O
>> ports (such as the UART for this case) you need to use -s for dosemu and
>> have it running with root privileges (e.g. adding it to sudo list, etc).
>>
>> Just using '-s' should not break the graphics as such, unless your
>> software is also trying direct graphics card I/O access and that is
>> being passed through.
>>
>
> My $_ports entry should only allow serial stuff direct access through
> right?
>
> I am running KDE and starting dosemu in a konsole terminal. When I do
> not use the -s option it opens in a small 640x350 window on my big
> screen and the dos "ega" graphics works. But the serial stuff is way too
> slow. Any time I use the -s option it opens in a window of max size and
> the ega stuff does not work but the serial stuff works well. The
> application screen at this point is all amiss. Even though it is mostly
> text. It acts this way when I run from a Virtual console also. IE tty2.
> Whether or not I use the -s option. From any tty1-6, 8-12 it does this.
>
> Is there a bug that causes the -s to use direct graphics card I/O
> access, even though the $_ports is not specifying it?
>
> Regards
> Mark
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>

If I comment out all the "can_do_root_stuff" code in 
src/emu-i386/ports.c so that the -s option is not required for port 
access, all works fine here.

Mark