kumquat-buildroot/arch/Config.in.arc
Alexey Brodkin 3720e28d15 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: 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>
2015-07-18 14:07:35 +02:00

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choice
prompt "Target CPU"
depends on BR2_arc
default BR2_arc770d
help
Specific CPU to use
config BR2_arc750d
bool "ARC 750D"
config BR2_arc770d
bool "ARC 770D"
config BR2_archs38
bool "ARC HS38"
endchoice
# Choice of atomic instructions presence
config BR2_ARC_ATOMIC_EXT
bool "Atomic extension (LLOCK/SCOND instructions)"
default y if BR2_arc770d || BR2_archs38
config BR2_ARCH_HAS_ATOMICS
default y if BR2_ARC_ATOMIC_EXT
config BR2_ARCH
default "arc" if BR2_arcle
default "arceb" if BR2_arceb
config BR2_arc
bool
default y if BR2_arcle || BR2_arceb
config BR2_ENDIAN
default "LITTLE" if BR2_arcle
default "BIG" if BR2_arceb
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