[Buildroot] [PATCH] ARC: allow selection of MMU page size
Alexey Brodkin
Alexey.Brodkin at synopsys.com
Thu Jul 16 19:04:01 UTC 2015
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 at synopsys.com>
c: Anton Kolesov <akolesov at synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
arch/Config.in.arc | 30 ++++++++++++++++++++++++++++++
package/uclibc/uclibc.mk | 8 ++++++++
2 files changed, 38 insertions(+)
diff --git a/arch/Config.in.arc b/arch/Config.in.arc
index b48a90f..e960eb8 100644
--- a/arch/Config.in.arc
+++ b/arch/Config.in.arc
@@ -40,3 +40,33 @@ 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. 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.
+
+config BR2_arc_page_size_4k
+ bool "4KB"
+ depends on BR2_arc770d || BR2_archs38
+
+config BR2_arc_page_size_8k
+ bool "8KB"
+
+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
diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
index 9dfafad..a2ba230 100644
--- a/package/uclibc/uclibc.mk
+++ b/package/uclibc/uclibc.mk
@@ -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)
--
2.4.3
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