| Message ID | 1405958507-8606-1-git-send-email-broonie@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Mark Brown wrote: > > From: Victor Kamensky <victor.kamensky@linaro.org> > > Exynos processors generally operate in little endian mode so their > bootloader and ROM will almost always operate in little endian mode. > This means that if a big endian kernel is run it must switch the CPU > into big endian mode after gaining control. > > The generic secondary_startup that is called from exynos specific > secondary startup code will do the switch, but we need it to do earlier > because exynos specific secondary_startup code which runs first also > works with data that is big endian when the kernel is compiled for big > endian. > > [Rewrote commit message. -- broonie] > > Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org> > Signed-off-by: Mark Brown <broonie@linaro.org> Hi Mark, Basically, I have no objection on this, BTW is there any requirement to support big endian on exynos stuff? Just wondering... Thanks, Kukjin > --- > arch/arm/mach-exynos/headsmp.S | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/arm/mach-exynos/headsmp.S b/arch/arm/mach-exynos/headsmp.S > index b54f9701e421..ac8364efb985 100644 > --- a/arch/arm/mach-exynos/headsmp.S > +++ b/arch/arm/mach-exynos/headsmp.S > @@ -18,6 +18,11 @@ > * ready for them to initialise. > */ > ENTRY(exynos4_secondary_startup) > + /* > + * ROM code operates in little endian mode, when we get control we > + * need to switch it to big endian mode. > + */ > +ARM_BE8(setend be) > mrc p15, 0, r0, c0, c0, 5 > and r0, r0, #15 > adr r4, 1f > -- > 2.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Jul 25, 2014 at 01:45:14PM +0900, Kukjin Kim wrote: > Basically, I have no objection on this, BTW is there any requirement to support > big endian on exynos stuff? Just wondering... We've been using it for testing within Linaro. I don't know of any real world users.
Mark Brown wrote: > > On Fri, Jul 25, 2014 at 01:45:14PM +0900, Kukjin Kim wrote: > > > Basically, I have no objection on this, BTW is there any requirement to support > > big endian on exynos stuff? Just wondering... > > We've been using it for testing within Linaro. I don't know of any real > world users. Mark, OK I see. I will apply. Thanks, Kukjin -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm/mach-exynos/headsmp.S b/arch/arm/mach-exynos/headsmp.S index b54f9701e421..ac8364efb985 100644 --- a/arch/arm/mach-exynos/headsmp.S +++ b/arch/arm/mach-exynos/headsmp.S @@ -18,6 +18,11 @@ * ready for them to initialise. */ ENTRY(exynos4_secondary_startup) + /* + * ROM code operates in little endian mode, when we get control we + * need to switch it to big endian mode. + */ +ARM_BE8(setend be) mrc p15, 0, r0, c0, c0, 5 and r0, r0, #15 adr r4, 1f