<s>
μClinux	B-Application
is	O
a	O
variation	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
previously	O
maintained	O
as	O
a	O
fork	B-Application
,	O
that	O
targets	O
microcontrollers	B-Architecture
without	O
a	O
memory	B-General_Concept
management	I-General_Concept
unit	I-General_Concept
(	O
MMU	O
)	O
.	O
</s>
<s>
It	O
was	O
integrated	O
into	O
the	O
mainline	B-Application
kernel	I-Application
as	O
of	O
2.5.46	O
;	O
the	O
project	O
continues	O
to	O
develop	O
patches	O
and	O
tools	O
for	O
microcontrollers	B-Architecture
.	O
</s>
<s>
The	O
homepage	O
lists	O
Linux	B-Operating_System
kernel	I-Operating_System
releases	O
for	O
2.0	O
,	O
2.4	O
and	O
2.6	O
(	O
all	O
of	O
which	O
are	O
end-of-life	O
in	O
mainline	O
)	O
.	O
</s>
<s>
The	O
letters	O
"	O
μC	B-Architecture
"	O
are	O
for	O
"	O
microcontroller	B-Architecture
"	O
:	O
the	O
name	O
is	O
pronounced	O
"	O
you-see-Linux	O
"	O
,	O
rather	O
than	O
pronouncing	O
the	O
letter	O
mu	O
as	O
in	O
Greek	O
.	O
</s>
<s>
μClinux	B-Application
was	O
originally	O
created	O
by	O
D	O
.	O
Jeff	O
Dionne	O
and	O
Kenneth	O
Albanowski	O
in	O
1998	O
.	O
</s>
<s>
Initially	O
,	O
they	O
targeted	O
the	O
Motorola	B-Device
DragonBall	I-Device
family	O
of	O
embedded	O
68k	B-Device
processors	O
(	O
specifically	O
the	O
68EZ328	O
series	O
used	O
in	O
the	O
Motorola	O
PalmPilot	O
)	O
on	O
a	O
2.0.33	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
<s>
After	O
releasing	O
their	O
initial	O
work	O
,	O
a	O
developer	O
community	O
quickly	O
sprang	O
up	O
extending	O
their	O
work	O
to	O
newer	O
kernels	B-Operating_System
and	O
other	O
microprocessor	O
architectures	O
.	O
</s>
<s>
In	O
early	O
1999	O
,	O
support	O
was	O
added	O
for	O
the	O
Motorola	O
(	O
now	O
NXP	O
)	O
ColdFire	B-Device
family	O
of	O
embedded	O
microprocessors	O
.	O
</s>
<s>
ARM	B-Architecture
processor	I-Architecture
support	O
was	O
added	O
later	O
.	O
</s>
<s>
Although	O
originally	O
targeting	O
2.0	O
series	O
Linux	B-Operating_System
kernels	I-Operating_System
,	O
it	O
now	O
has	O
ports	O
based	O
on	O
Linux	B-Operating_System
2.4	I-Operating_System
and	O
Linux	B-Operating_System
2.6	I-Operating_System
.	O
</s>
<s>
The	O
Linux	B-Operating_System
2.4	I-Operating_System
ports	O
were	O
forward	O
ported	O
from	O
the	O
2.0.36	O
Linux	B-Operating_System
kernel	I-Operating_System
by	O
Michael	O
Leslie	O
and	O
Evan	O
Stawnyczy	O
during	O
their	O
work	O
at	O
Rt-Control	O
.	O
</s>
<s>
There	O
were	O
never	O
any	O
μClinux	B-Application
extensions	O
applied	O
to	O
the	O
2.2	O
series	O
kernels	B-Operating_System
.	O
</s>
<s>
Since	O
version	O
2.5.46	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
the	O
major	O
parts	O
of	O
μClinux	B-Application
have	O
been	O
integrated	O
with	O
the	O
mainline	B-Application
kernel	I-Application
for	O
a	O
number	O
of	O
processor	O
architectures	O
.	O
</s>
<s>
Greg	O
Ungerer	O
(	O
who	O
originally	O
ported	O
μClinux	B-Application
to	O
the	O
Motorola	B-Device
ColdFire	I-Device
family	O
of	O
processors	O
)	O
continued	O
to	O
maintain	O
and	O
actively	O
push	O
core	O
μClinux	B-Application
support	O
into	O
the	O
2.6	O
series	O
Linux	B-Operating_System
kernels	I-Operating_System
.	O
</s>
<s>
In	O
this	O
regard	O
,	O
μClinux	B-Application
is	O
essentially	O
no	O
longer	O
a	O
separate	O
fork	B-Application
of	O
Linux	B-Operating_System
.	O
</s>
<s>
μClinux	B-Application
had	O
support	O
for	O
many	O
architectures	O
,	O
and	O
forms	O
the	O
basis	O
of	O
many	O
products	O
,	O
like	O
network	B-Protocol
routers	I-Protocol
,	O
security	O
cameras	O
,	O
DVD	B-Device
or	O
MP3	O
players	O
,	O
VoIP	B-Application
phone	O
or	O
gateways	O
,	O
scanners	B-Application
,	O
and	O
card	O
readers	O
.	O
</s>
<s>
The	O
obsolete	O
CPU	O
architectures	O
set	O
to	O
be	O
removed	O
in	O
Linux	B-Operating_System
4.17	O
and	O
subsequent	O
releases	O
included	O
ADI	O
Blackfin	B-General_Concept
,	O
Etrax	B-Device
CRIS	I-Device
,	O
Fujitsu	B-General_Concept
FR-V	I-General_Concept
,	O
Mitsubishi	O
M32R	B-Device
,	O
Matsushita/Panasonic	O
MN10300	O
,	O
Imagination	O
META	O
(	O
Metag	O
)	O
,	O
and	O
Tilera	O
TILE	O
.	O
</s>
<s>
Hitachi/Renesas	O
H8	O
(	O
h8300	B-Device
)	O
-	O
removed	O
in	O
Linux	B-Operating_System
5.19	O
.	O
</s>
<s>
Before	O
Linux	B-Operating_System
4.17	O
the	O
following	O
architectures	O
were	O
also	O
supported	O
:	O
</s>
