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ARC: allow selection of MMU page size

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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: 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>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Alexey Brodkin 2015-07-17 12:11:42 +03:00 committed by Thomas Petazzoni
parent daa433bff6
commit 3720e28d15
2 changed files with 46 additions and 0 deletions
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38
arch/Config.in.arc
View File

@ -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

8
package/uclibc/uclibc.mk
View File

@ -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)