> -----Original Message----- > From: Robin Murphy [mailto:robin.mur...@arm.com] > Sent: Friday, September 23, 2016 7:17 AM > To: Alison Wang <b18...@freescale.com>; shawn...@kernel.org; > ker...@pengutronix.de; Fabio Estevam > Estevam <fabio.este...@nxp.com>; li...@armlinux.org.uk; > linux-arm-ker...@lists.infradead.org; linux- > ker...@vger.kernel.org; Scott Wood <scott.w...@nxp.com>; Stuart Yoder > <stuart.yo...@nxp.com>; Leo Li > <leoyang...@nxp.com> > Cc: Jason Jin <jason....@nxp.com> > Subject: Re: [PATCH 1/2] armv8: aarch32: Execute 32-bit Linux for LayerScape > platforms > > Hi Alison, > > On 23/09/16 03:19, Alison Wang wrote: > > The ARMv8 architecture supports: > > 1. 64-bit execution state, AArch64. > > 2. 32-bit execution state, AArch32, that is compatible with previous > > versions of the ARM architecture. > > > > LayerScape platforms are compliant with ARMv8 architecture. This patch > > is to support running 32-bit Linux kernel for LayerScape platforms. > > > > Verified on LayerScape LS1043ARDB, LS1012ARDB, LS1046ARDB boards. > > > > Signed-off-by: Ebony Zhu <ebony....@nxp.com> > > Signed-off-by: Alison Wang <alison.w...@nxp.com> > > --- > > arch/arm/Kconfig | 9 +++++++++ > > arch/arm/mach-imx/Kconfig | 14 ++++++++++++++ > > arch/arm/mach-imx/Makefile | 4 +++- > > arch/arm/mach-imx/mach-layerscape.c | 23 +++++++++++++++++++++++ > > 4 files changed, 49 insertions(+), 1 deletion(-) > > create mode 100644 arch/arm/mach-imx/mach-layerscape.c > > > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > > index f0c8068..e8d470e 100644 > > --- a/arch/arm/Kconfig > > +++ b/arch/arm/Kconfig > > @@ -294,6 +294,15 @@ config PGTABLE_LEVELS > > default 3 if ARM_LPAE > > default 2 > > > > +config ARCH_AARCH32_ES_SUPPORT > > + def_bool n > > + help > > + The ARMv8 architecture supports 64-bit execution state, AArch64 > > + and 32-bit execution state, AArch32, that is compatible with > > + previous versions of the ARM architecture. > > + > > + Enable AArch32 execution state support for ARMv8 architecture. > > What's this supposed to do, exactly? I've been running 32-bit kernels on > my Juno with very little issue (beyond a couple of DT tweaks, and some > firmware hacks with a corresponding bit of A64 assembly tacked on the > front of the zImage to switch into AArch32 state).
Which arch/arm/mach-* platform are you using for Juno? Thanks, Stuart
