Commit 3720e28d authored by Alexey Brodkin's avatar Alexey Brodkin Committed by Thomas Petazzoni
Browse files

ARC: allow selection of MMU page size 



Modern ARC cores (those sporting MMU of version 3 and 4) allow selection
of different page sizes (4, 8 or 16 kB) during ASIC design creation.
And it's important to build a toolchain with page size setting that matches
hardware.

Otherwise user-space applications will fail on execution due to
unexpected data layout/alignment etc.

[Thomas: slightly improve help text, fix indentation of help text.]

Signed-off-by: default avatarAlexey Brodkin <abrodkin@synopsys.com>
Cc: Anton Kolesov <akolesov@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
parent daa433bf

arch/Config.in.arc

+38 −0
Original line number Diff line number Diff line
@@ -40,3 +40,41 @@ config BR2_GCC_TARGET_CPU 
	default "arc700" if BR2_arc750d

	default "arc700" if BR2_arc770d

	default "archs"	 if BR2_archs38



choice

	prompt "MMU Page Size"

	default BR2_ARC_PAGE_SIZE_8K

	help

	  MMU starting from version 3 (found in ARC 770) and now

	  version 4 (found in ARC HS38) allows the selection of the

	  page size during ASIC design creation.



	  The following options are available for MMU v3 and v4: 4kB,

	  8kB and 16 kB.



	  The default is 8 kB (that really matches the only page size

	  in MMU v2).  It is important to build a toolchain with page

	  size matching the hardware configuration. Otherwise

	  user-space applications will fail at runtime.



config BR2_ARC_PAGE_SIZE_4K

	bool "4KB"

	depends on BR2_arc770d || BR2_archs38



config BR2_ARC_PAGE_SIZE_8K

	bool "8KB"

	help

	  This is the one and only option available for MMUv2 and

	  default value for MMU v3 and v4.



config BR2_ARC_PAGE_SIZE_16K

	bool "16KB"

	depends on BR2_arc770d || BR2_archs38



endchoice



config BR2_ARC_PAGE_SIZE

	string

	default "4K" if BR2_ARC_PAGE_SIZE_4K

	default "8K" if BR2_ARC_PAGE_SIZE_8K

	default "16K" if BR2_ARC_PAGE_SIZE_16K

package/uclibc/uclibc.mk

+8 −0
Original line number Diff line number Diff line
@@ -70,6 +70,13 @@ UCLIBC_ARC_TYPE = CONFIG_$(call qstrip,$(BR2_UCLIBC_ARC_TYPE)) 
define UCLIBC_ARC_TYPE_CONFIG

	$(call KCONFIG_ENABLE_OPT,$(UCLIBC_ARC_TYPE),$(@D)/.config)

endef



UCLIBC_ARC_PAGE_SIZE = CONFIG_ARC_PAGE_SIZE_$(call qstrip,$(BR2_ARC_PAGE_SIZE))

define UCLIBC_ARC_PAGE_SIZE_CONFIG

	$(SED) '/CONFIG_ARC_PAGE_SIZE_*/d' $(@D)/.config

	$(call KCONFIG_ENABLE_OPT,$(UCLIBC_ARC_PAGE_SIZE),$(@D)/.config)

endef



endif # arc



#
@@ -367,6 +374,7 @@ define UCLIBC_KCONFIG_FIXUP_CMDS 
	$(call KCONFIG_SET_OPT,SHARED_LIB_LOADER_PREFIX,"/lib",$(@D)/.config)

	$(UCLIBC_MMU_CONFIG)

	$(UCLIBC_ARC_TYPE_CONFIG)

	$(UCLIBC_ARC_PAGE_SIZE_CONFIG)

	$(UCLIBC_ARM_ABI_CONFIG)

	$(UCLIBC_ARM_BX_CONFIG)

	$(UCLIBC_MIPS_ABI_CONFIG)