Commit ca5955dd authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Ingo Molnar
Browse files

x86/cpu: Document CONFIG_X86_INTEL_MID as 64-bit-only 



The X86_INTEL_MID code was originally introduced for the 32-bit
Moorestown/Medfield/Clovertrail platform, later the 64-bit
Merrifield/Moorefield variants were added, but the final Morganfield
14nm platform was canceled before it hit the market.

To help users understand what the option actually refers to, update the
help text, and add a dependency on 64-bit kernels.

Ferry confirmed that all the hardware can run 64-bit kernels these days,
but is still testing 32-bit kernels on the Intel Edison board, so this
remains possible, but is guarded by a CONFIG_EXPERT dependency now,
to gently push remaining users towards using CONFIG_64BIT.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarAndy Shevchenko <andy@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250226213714.4040853-9-arnd@kernel.org
parent 0081fdec

arch/x86/Kconfig

+29 −21
Original line number Diff line number Diff line
@@ -549,12 +549,12 @@ config X86_EXTENDED_PLATFORM 
		RDC R-321x SoC

		SGI 320/540 (Visual Workstation)

		STA2X11-based (e.g. Northville)

		Moorestown MID devices



	  64-bit platforms (CONFIG_64BIT=y):

		Numascale NumaChip

		ScaleMP vSMP

		SGI Ultraviolet

		Merrifield/Moorefield MID devices



	  If you have one of these systems, or if you want to build a

	  generic distribution kernel, say Y here - otherwise say N.
@@ -599,8 +599,31 @@ config X86_UV 
	  This option is needed in order to support SGI Ultraviolet systems.

	  If you don't have one of these, you should say N here.



# Following is an alphabetically sorted list of 32 bit extended platforms

# Please maintain the alphabetic order if and when there are additions

config X86_INTEL_MID

	bool "Intel Z34xx/Z35xx MID platform support"

	depends on X86_EXTENDED_PLATFORM

	depends on X86_PLATFORM_DEVICES

	depends on PCI

	depends on X86_64 || (EXPERT && PCI_GOANY)

	depends on X86_IO_APIC

	select I2C

	select DW_APB_TIMER

	select INTEL_SCU_PCI

	help

	  Select to build a kernel capable of supporting 64-bit Intel MID

	  (Mobile Internet Device) platform systems which do not have

	  the PCI legacy interfaces.



	  The only supported devices are the 22nm Merrified (Z34xx)

	  and Moorefield (Z35xx) SoC used in the Intel Edison board and

	  a small number of Android devices such as the Asus Zenfone 2,

	  Asus FonePad 8 and Dell Venue 7.



	  If you are building for a PC class system or non-MID tablet

	  SoCs like Bay Trail (Z36xx/Z37xx), say N here.



	  Intel MID platforms are based on an Intel processor and chipset which

	  consume less power than most of the x86 derivatives.



config X86_GOLDFISH

	bool "Goldfish (Virtual Platform)"
@@ -610,6 +633,9 @@ config X86_GOLDFISH 
	  for Android development. Unless you are building for the Android

	  Goldfish emulator say N here.



# Following is an alphabetically sorted list of 32 bit extended platforms

# Please maintain the alphabetic order if and when there are additions



config X86_INTEL_CE

	bool "CE4100 TV platform"

	depends on PCI
@@ -625,24 +651,6 @@ config X86_INTEL_CE 
	  This option compiles in support for the CE4100 SOC for settop

	  boxes and media devices.



config X86_INTEL_MID

	bool "Intel MID platform support"

	depends on X86_EXTENDED_PLATFORM

	depends on X86_PLATFORM_DEVICES

	depends on PCI

	depends on X86_64 || (PCI_GOANY && X86_32)

	depends on X86_IO_APIC

	select I2C

	select DW_APB_TIMER

	select INTEL_SCU_PCI

	help

	  Select to build a kernel capable of supporting Intel MID (Mobile

	  Internet Device) platform systems which do not have the PCI legacy

	  interfaces. If you are building for a PC class system say N here.



	  Intel MID platforms are based on an Intel processor and chipset which

	  consume less power than most of the x86 derivatives.



config X86_INTEL_QUARK

	bool "Intel Quark platform support"

	depends on X86_32