@@ -40,3 +40,40 @@ 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 (could be found in ARC 770) and now
+ version 4 (could be found in ARC HS38) allows selection of page
+ size during ASIC design creation.
+
+ Following options are available for MMU v3 and v4: 4kB, 8kB and 16 kB.
+
+ 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
@@ -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)
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. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Anton Kolesov <akolesov@synopsys.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Arnout Vandecappelle <arnout@mind.be> --- Changes compared to v1: [1] Use upper-case in BR2_ARC_PAGE_SIZE_x [2] Updated comments arch/Config.in.arc | 37 +++++++++++++++++++++++++++++++++++++ package/uclibc/uclibc.mk | 8 ++++++++ 2 files changed, 45 insertions(+)