Messages in this thread Patch in this message | | | Date | Thu, 10 Nov 2011 22:57:37 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH v8 16/16] ARM: LPAE: Add the Kconfig entries |
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On Mon, Nov 07, 2011 at 04:16:58PM +0000, Catalin Marinas wrote: > This patch adds the ARM_LPAE and ARCH_PHYS_ADDR_T_64BIT Kconfig entries > allowing LPAE support to be compiled into the kernel. > > Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> > --- > arch/arm/Kconfig | 2 +- > arch/arm/mm/Kconfig | 17 +++++++++++++++++ > 2 files changed, 18 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig > index 44789ef..885c04e 100644 > --- a/arch/arm/Kconfig > +++ b/arch/arm/Kconfig > @@ -1959,7 +1959,7 @@ endchoice > > config XIP_KERNEL > bool "Kernel Execute-In-Place from ROM" > - depends on !ZBOOT_ROM > + depends on !ZBOOT_ROM && !ARM_LPAE > help > Execute-In-Place allows the kernel to run from non-volatile storage > directly addressable by the CPU, such as NOR flash. This saves RAM > diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig > index 67f75a0..d289cdb 100644 > --- a/arch/arm/mm/Kconfig > +++ b/arch/arm/mm/Kconfig > @@ -629,6 +629,23 @@ config IO_36 > > comment "Processor Features" > > +config ARM_LPAE > + bool "Support for the Large Physical Address Extension" > + depends on MMU && CPU_V7 > + help > + Say Y if you have an ARMv7 processor supporting the LPAE page > + table format and you would like to access memory beyond the > + 4GB limit. The resulting kernel image will not run on > + processors without the LPA extension. > + > + If unsure, say N. > + > +config ARCH_PHYS_ADDR_T_64BIT > + def_bool ARM_LPAE > + > +config ARCH_DMA_ADDR_T_64BIT > + def_bool ARM_LPAE > +
I still say this shouldn't depend on the host page table format. LPAE itself has nothing to do with whether 64-bit DMA addresses are supported by the system.
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