<s>
The	O
Uniform	B-Application
Driver	I-Application
Interface	I-Application
(	O
UDI	O
)	O
is	O
a	O
defunct	O
project	O
developed	O
by	O
several	O
companies	O
to	O
define	O
a	O
portable	O
interface	O
for	O
device	B-Application
drivers	I-Application
.	O
</s>
<s>
The	O
Uniform	B-Application
Driver	I-Application
Interface	I-Application
(	O
UDI	O
)	O
allowed	O
device	B-Application
drivers	I-Application
to	O
be	O
portable	O
across	O
both	O
hardware	O
platforms	O
and	O
operating	B-General_Concept
systems	I-General_Concept
without	O
any	O
changes	O
to	O
the	O
driver	O
source	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
UDI	O
architecture	O
was	O
intended	O
to	O
insulate	O
drivers	O
from	O
platform	O
specifics	O
such	O
as	O
byte-ordering	O
,	O
DMA	B-General_Concept
implications	O
,	O
multi-processing	O
,	O
interrupt	O
implementations	O
and	O
I/O	O
bus	O
topologies	O
.	O
</s>
<s>
While	O
UDI	O
could	O
potentially	O
benefit	O
open	B-License
source	I-License
operating	B-General_Concept
systems	I-General_Concept
such	O
as	O
Linux	B-Application
and	O
*	B-Operating_System
BSD	I-Operating_System
by	O
providing	O
more	O
driver	O
support	O
from	O
companies	O
,	O
some	O
open	O
source/free	O
software	O
advocates	O
feared	O
that	O
UDI	O
would	O
cause	O
a	O
proliferation	O
of	O
closed	O
source	O
drivers	O
and	O
a	O
reduction	O
in	O
open	B-License
source	I-License
support	O
by	O
companies	O
,	O
undermining	O
the	O
purpose	O
of	O
the	O
free	B-Application
software	I-Application
and	O
open	B-License
source	I-License
movements	O
.	O
</s>
<s>
Richard	O
Stallman	O
(	O
the	O
leader	O
of	O
the	O
free	B-Application
software	I-Application
movement	O
)	O
has	O
claimed	O
that	O
the	O
project	O
does	O
not	O
benefit	O
the	O
free	B-Application
software	I-Application
movement	O
.	O
</s>
