<s>
iPhone	B-Operating_System
and	O
iPod	B-Device
Touch	I-Device
models	O
released	O
between	O
2007	O
and	O
2009	O
used	O
system	B-Architecture
on	I-Architecture
a	I-Architecture
chip	I-Architecture
(	O
SoC	O
)	O
circuits	O
designed	O
by	O
Samsung	B-Application
and	O
manufactured	O
to	O
Apple	O
's	O
specifications	O
.	O
</s>
<s>
Two	O
such	O
SoCs	O
were	O
used	O
:	O
the	O
Samsung	B-Application
S5L8900	B-Application
,	O
used	O
in	O
the	O
first-generation	B-Operating_System
iPhone	I-Operating_System
,	O
the	O
iPhone	B-Operating_System
3G	I-Operating_System
,	O
and	O
the	O
first-generation	B-Device
iPod	I-Device
Touch	I-Device
,	O
and	O
the	O
Samsung	B-Application
S5L8920	O
,	O
used	O
in	O
the	O
iPhone	B-Operating_System
3GS	I-Operating_System
and	O
the	O
third-generation	B-Operating_System
iPod	I-Operating_System
Touch	I-Operating_System
.	O
</s>
<s>
Both	O
chips	O
belong	O
to	O
Samsung	B-Application
's	O
S5L	B-Application
family	O
of	O
SoCs	O
.	O
</s>
<s>
In	O
2006	O
,	O
Apple	O
introduced	O
the	O
2nd	O
generation	O
iPod	B-Operating_System
nano	O
and	O
the	O
iPod	B-Operating_System
Classic	I-Operating_System
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
,	O
internally	O
called	O
Project	O
Purple	O
,	O
was	O
also	O
in	O
development	O
.	O
</s>
<s>
Apple	O
needed	O
new	O
SoCs	O
for	O
this	O
planned	O
expansion	O
of	O
the	O
product	O
range	O
,	O
so	O
the	O
S5L87	O
SoCs	O
were	O
created	O
for	O
the	O
less	O
power-hungry	O
iPod	B-Operating_System
family	O
,	O
and	O
-	O
after	O
initial	O
iPhone	B-Operating_System
prototypes	O
with	O
a	O
Freescale	O
i.MX31	O
SoC	O
,	O
the	O
S5L89	O
SoCs	O
were	O
adopted	O
.	O
</s>
<s>
The	O
S5L87	O
SoCs	O
were	O
the	O
successors	O
of	O
the	O
PortalPlayer	O
processors	O
used	O
in	O
the	O
iPod	B-Operating_System
until	O
then	O
.	O
</s>
<s>
In	O
the	O
years	O
leading	O
up	O
to	O
the	O
original	B-Operating_System
iPhone	I-Operating_System
's	O
launch	O
,	O
Intel	O
was	O
in	O
talks	O
with	O
Apple	O
to	O
use	O
Intel	B-Operating_System
x86	I-Operating_System
chips	O
for	O
the	O
iPhone	B-Operating_System
's	O
processor	O
,	O
instead	O
of	O
ARM	B-Architecture
.	O
</s>
<s>
The	O
Samsung	B-Application
S5L8900	B-Application
is	O
a	O
32-bit	O
system	B-Architecture
on	I-Architecture
a	I-Architecture
chip	I-Architecture
(	O
SoC	O
)	O
manufactured	O
by	O
Samsung	B-Application
for	O
Apple	O
.	O
</s>
<s>
It	O
combines	O
an	O
ARM	B-Architecture
CPU	O
with	O
a	O
PowerVR	B-Device
graphics	O
processor	O
.	O
</s>
<s>
The	O
first	O
product	O
to	O
feature	O
the	O
chip	O
was	O
the	O
iPhone	B-Operating_System
,	O
followed	O
by	O
the	O
iPod	B-Device
Touch	I-Device
,	O
and	O
iPhone	B-Operating_System
3G	I-Operating_System
.	O
</s>
<s>
Other	O
names	O
for	O
the	O
S5L8900	B-Application
are	O
ARM	B-Architecture
8900B	O
and	O
APL0098	O
.	O
</s>
<s>
It	O
belongs	O
to	O
Samsung	B-Application
's	O
S5L	B-Application
family	O
of	O
SoCs	O
.	O
</s>
<s>
The	O
S5L8900	B-Application
contains	O
a	O
32-bit	O
ARMv6	O
compatible	O
ARM	B-Architecture
1176JZF-S	O
CPU	O
core	O
and	O
is	O
manufactured	O
in	O
the	O
90	O
nm	O
CMOS	O
process	O
.	O
</s>
<s>
As	O
SoC	O
,	O
S5L8900	B-Application
also	O
has	O
an	O
integrated	O
GPU	O
,	O
a	O
PowerVR	B-Device
MBX	O
LITE	O
clocked	O
at	O
60	O
MHz	O
.	O
</s>
<s>
The	O
S5L8900	B-Application
thus	O
supports	O
OpenGL	O
1.1	O
.	O
</s>
<s>
Competing	O
architectures	O
of	O
similar	O
products	O
are	O
Qualcomm	O
's	O
Snapdragon	B-Architecture
,	O
Texas	O
Instruments	O
 '	O
OMAP	B-Device
4	O
,	O
Nvidia	O
's	O
Tegra	B-Operating_System
2	O
and	O
Samsung	B-Application
's	O
Exynos	O
.	O
</s>
<s>
Other	O
names	O
for	O
the	O
S5L8900	B-Application
are	O
''	O
ARM	B-Architecture
8900B''	O
and	O
''	O
APL0098''	O
.	O
</s>
<s>
The	O
last	O
operating	O
system	O
update	O
Apple	O
provided	O
for	O
a	O
mobile	O
device	O
containing	O
an	O
S5L8900	B-Application
(	O
iPhone	B-Operating_System
3G	I-Operating_System
)	O
was	O
iOS	B-Operating_System
4.2.1	I-Operating_System
,	O
which	O
was	O
released	O
on	O
November	O
22	O
,	O
2010	O
.	O
</s>
<s>
The	O
Samsung	B-Application
S5L8920	O
is	O
a	O
32-bit	O
system	B-Architecture
on	I-Architecture
a	I-Architecture
chip	I-Architecture
(	O
SoC	O
)	O
manufactured	O
by	O
Samsung	B-Application
for	O
Apple	O
.	O
</s>
<s>
The	O
only	O
iPhone	B-Operating_System
to	O
use	O
it	O
was	O
the	O
iPhone	B-Operating_System
3GS	I-Operating_System
,	O
before	O
being	O
replaced	O
with	O
the	O
Apple	O
A4	O
with	O
the	O
release	O
of	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
<s>
The	O
chip	O
is	O
an	O
updated	O
version	O
of	O
the	O
S5L8900	B-Application
with	O
more	O
processing	O
power	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
the	O
iPhone	B-Operating_System
3GS	I-Operating_System
was	O
widely	O
praised	O
for	O
its	O
increased	O
CPU	O
and	O
GPU	O
performance	O
.	O
</s>
<s>
The	O
S5L8920	O
contains	O
an	O
ARM	B-Application
Cortex-A8	I-Application
main	O
processor	O
that	O
is	O
compatible	O
with	O
32-bit	O
Armv7	O
,	O
and	O
backward	O
compatible	O
with	O
ARMv6	O
.	O
</s>
<s>
The	O
standard	O
Cortex-A8	B-Application
clock	O
rate	O
is	O
normally	O
833	O
MHz	O
,	O
but	O
has	O
been	O
lowered	O
by	O
Apple	O
to	O
around	O
600	O
MHz	O
.	O
</s>
<s>
Like	O
its	O
predecessor	O
SoCs	O
,	O
the	O
S5L8920	O
also	O
has	O
an	O
integrated	O
GPU	O
,	O
a	O
PowerVR	B-Device
SGX535	O
.	O
</s>
<s>
Similar	O
competing	O
architectures	O
include	O
Qualcomm	O
's	O
Snapdragon	B-Architecture
,	O
Texas	O
Instruments	O
 '	O
OMAP	B-Device
4	O
,	O
Nvidia	O
's	O
Tegra	B-Operating_System
2	O
and	O
Samsung	B-Application
's	O
Exynos	O
.	O
</s>
<s>
The	O
last	O
operating	O
system	O
that	O
supported	O
the	O
S5L8920	O
chip	O
was	O
iOS	B-Operating_System
6.1.6	I-Operating_System
,	O
which	O
was	O
released	O
on	O
February	O
21	O
,	O
2014	O
.	O
</s>
<s>
A	O
design	O
flaw	O
was	O
discovered	O
in	O
S5L89xx	O
iPhone	B-Operating_System
chips	O
:	O
it	O
allows	O
arbitrary	O
code	O
to	O
be	O
executed	O
through	O
the	O
limera1n	O
exploit	O
,	O
a	O
BootROM	O
bug	O
,	O
which	O
was	O
mainly	O
used	O
by	O
jailbreaks	B-Application
.	O
</s>
<s>
This	O
bug	O
,	O
which	O
cannot	O
be	O
patched	O
through	O
software	O
updates	O
,	O
also	O
allows	O
,	O
among	O
other	O
things	O
,	O
the	O
passcode	O
lock	O
of	O
the	O
iPhone	B-Operating_System
to	O
be	O
bypassed	O
by	O
executing	O
a	O
bruteforce	O
program	O
within	O
a	O
few	O
minutes	O
without	O
much	O
effort	O
.	O
</s>
<s>
Apple	O
later	O
switched	O
to	O
designing	O
their	O
chips	O
in-house	O
after	O
their	O
acquisition	O
of	O
Intrinsity	O
and	O
PA	O
Semi	O
,	O
leading	O
to	O
the	O
creation	O
of	O
the	O
Apple	O
A4	O
used	O
in	O
the	O
iPhone	B-Operating_System
4	I-Operating_System
.	O
</s>
