From mboxrd@z Thu Jan 1 00:00:00 1970 From: myungjoo.ham@samsung.com (MyungJoo Ham) Date: Wed, 21 Jul 2010 10:13:30 +0900 Subject: [PATCH v3 1/7] ARM: S5PV210: Add a Kconfig entry "S5PC110_EVT0_WORKAROUND" In-Reply-To: <4C464127.5040405@simtec.co.uk> References: <1279517483-22751-1-git-send-email-myungjoo.ham@samsung.com> <1279517483-22751-2-git-send-email-myungjoo.ham@samsung.com> <4C464127.5040405@simtec.co.uk> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, Jul 21, 2010 at 9:36 AM, Ben Dooks 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 >> Signed-off-by: Kyungmin Park >> --- >> ?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. -- MyungJoo Ham (???), Ph.D. Mobile Software Platform Lab, Digital Media and Communications (DMC) Business Samsung Electronics cell: 82-10-6714-2858