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The mem device provides direct memory access (needed e.g. for Xorg), but some
packages (Xorg, notably) are still using the iopl device.
diff --git a/i386/i386at/conf.c b/i386/i386at/conf.c
index d51b5ee..88e753c 100644
--- a/i386/i386at/conf.c
+++ b/i386/i386at/conf.c
@@ -135,6 +135,10 @@ struct dev_ops dev_name_list[] =
nodev, nodev, nodev, memmmap,
nodev, nulldev, nulldev, 0,
nodev },
+ { "iopl", nulldev, nulldev, nodev,
+ nodev, nodev, nodev, memmmap,
+ nodev, nulldev, nulldev, 0,
+ nodev },
#endif /* MACH_HYP */
#ifdef MACH_KMSG
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