# \[PATCH v3 1/7\] ARM: S5PV210: Add a Kconfig entry "S5PC110\_EVT0\_WORKAROUND"

- From: Kyungmin Park \<hidden\>
- Date: 2010-07-21 13:51:32 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2010/07/8553268
- Thread: https://ratatoskr.run/linux-arm-kernel/2010/07/8553060/t.md

```text
On Wed, Jul 21, 2010 at 8:47 PM, Ben Dooks [ref] wrote:
> On 21/07/10 02:13, MyungJoo Ham wrote:
>> On Wed, Jul 21, 2010 at 9:36 AM, Ben Dooks [ref] wrote:
>>> On 07/19/10 06:31, MyungJoo Ham wrote:
>>>>
>>>> Early S5PC110 (EVT0) chip had some issues required workaround from a
>>>> kernel. We can add such workaround codes with this Kconfig entry.
>>>>
>>>> Signed-off-by: MyungJoo Ham<myungjoo.ham@samsung.com>
>>>> Signed-off-by: Kyungmin Park<kyungmin.park@samsung.com>
>>>> ---
>>>> ?arch/arm/mach-s5pv210/Kconfig | ? ?7 +++++++
>>>> ?1 files changed, 7 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
>>>> index 631019a..18802e7 100644
>>>> --- a/arch/arm/mach-s5pv210/Kconfig
>>>> +++ b/arch/arm/mach-s5pv210/Kconfig
>>>> @@ -101,4 +101,11 @@ config MACH_SMDKC110
>>>> ? ? ? ? ?Machine support for Samsung SMDKC110
>>>> ? ? ? ? ?S5PC110(MCP) is one of package option of S5PV210
>>>>
>>>> +config S5PC110_EVT0_WORKAROUND
>>>> + ? ? ? bool "S5PC110 Early Chip Workaround (EVT0)"
>>>> + ? ? ? help
>>>> + ? ? ? ? Early S5PC110 (so called EVT0) has errata items that should be
>>>> + ? ? ? ? addressed; otherwise the kernel may panic or be locked up.
>>>> Enable
>>>> + ? ? ? ? this option to execute workaround instructions.
>>>> +
>>>> ?endif
>>>
>>> What happens for non EVT0, is the a performance issue or is it exclusive?
>>>
>>
>> This S5PC110_EVT0_WORKAROUND addresses issues (erratic behaviors, not
>> performance issues) of "EVT-0" revisions, which is exclusive for these
>> EVT-0 only. They do not apply to the later (EVT-1 and so on) chips.
>
> Ok, so does the fix work for just EVT0? Does it exclude supporting other
> EVT sillicon as well?

Mr. Ham will reply it.

As I know "yes", just FYI now Mr. Ham works on it. you can see it
http://git.infradead.org/users/kmpark/linux-2.6-samsung clock and
cpufreq branch.

If you have a good idea, give your opinions.

Thank you,
Kyungmin Park
```