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Date: Thu, 10 Jul 2014 14:47:10 -0700
Message-ID: <CAB9Rao96Y6t9ctvugjqpv+wP5LH+mErYCCJ2bAvcE3qwtMQ50A@mail.gmail.com>
Subject: Re: Using outportb() with djgpp
From: Louis Santillan <lpsantil AT gmail DOT com>
To: "djgpp AT delorie DOT com" <djgpp AT delorie DOT com>
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Often?  Real hardware or VM?  Which OS?  Are you sure it's the djgpp code
that's causing the reboot? Do you maybe need to clear interrupts while
writing & then reset?


On Thu, Jul 10, 2014 at 1:20 PM, Mateusz Viste <mateusz DOT viste AT delorie DOT com>
wrote:

> Hi,
>
> I am trying to write to a hardware port from within djgpp, using
> outportb(). It does work from time to time, but often outportb() will make
> the whole PC reboot. Specifically I am writing to port 0x330 (to a MPU401
> adapter). If using the same code with turbo C, it works perfectly. Hence I
> am wondering: are there any special "rules" I should be aware of when
> trying to outportb() from within protected mode?
>
> regards,
> Mateusz
>

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<div dir=3D"ltr">Often? =C2=A0Real hardware or VM? =C2=A0Which OS? =C2=A0Ar=
e you sure it&#39;s the djgpp code that&#39;s causing the reboot? Do you ma=
ybe need to clear interrupts while writing &amp; then reset?</div><div clas=
s=3D"gmail_extra">
<br><br><div class=3D"gmail_quote">On Thu, Jul 10, 2014 at 1:20 PM, Mateusz=
 Viste <span dir=3D"ltr">&lt;<a href=3D"mailto:mateusz DOT viste AT delorie DOT com" t=
arget=3D"_blank">mateusz DOT viste AT delorie DOT com</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">
Hi,<br>
<br>
I am trying to write to a hardware port from within djgpp, using outportb()=
. It does work from time to time, but often outportb() will make the whole =
PC reboot. Specifically I am writing to port 0x330 (to a MPU401 adapter). I=
f using the same code with turbo C, it works perfectly. Hence I am wonderin=
g: are there any special &quot;rules&quot; I should be aware of when trying=
 to outportb() from within protected mode?<br>

<br>
regards,<br>
Mateusz<br>
</blockquote></div><br></div>

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