3720e28d15
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>
81 lines
1.7 KiB
Plaintext
81 lines
1.7 KiB
Plaintext
choice
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prompt "Target CPU"
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depends on BR2_arc
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default BR2_arc770d
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help
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Specific CPU to use
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config BR2_arc750d
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bool "ARC 750D"
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config BR2_arc770d
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bool "ARC 770D"
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config BR2_archs38
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bool "ARC HS38"
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endchoice
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# Choice of atomic instructions presence
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config BR2_ARC_ATOMIC_EXT
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bool "Atomic extension (LLOCK/SCOND instructions)"
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default y if BR2_arc770d || BR2_archs38
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config BR2_ARCH_HAS_ATOMICS
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default y if BR2_ARC_ATOMIC_EXT
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config BR2_ARCH
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default "arc" if BR2_arcle
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default "arceb" if BR2_arceb
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config BR2_arc
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bool
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default y if BR2_arcle || BR2_arceb
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config BR2_ENDIAN
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default "LITTLE" if BR2_arcle
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default "BIG" if BR2_arceb
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config BR2_GCC_TARGET_CPU
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default "arc700" if BR2_arc750d
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default "arc700" if BR2_arc770d
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default "archs" if BR2_archs38
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choice
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prompt "MMU Page Size"
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default BR2_ARC_PAGE_SIZE_8K
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help
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MMU starting from version 3 (found in ARC 770) and now
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version 4 (found in ARC HS38) allows the selection of the
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page size during ASIC design creation.
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The following options are available for MMU v3 and v4: 4kB,
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8kB and 16 kB.
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The default is 8 kB (that really matches the only page size
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in MMU v2). It is important to build a toolchain with page
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size matching the hardware configuration. Otherwise
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user-space applications will fail at runtime.
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config BR2_ARC_PAGE_SIZE_4K
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bool "4KB"
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depends on BR2_arc770d || BR2_archs38
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config BR2_ARC_PAGE_SIZE_8K
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bool "8KB"
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help
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This is the one and only option available for MMUv2 and
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default value for MMU v3 and v4.
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config BR2_ARC_PAGE_SIZE_16K
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bool "16KB"
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depends on BR2_arc770d || BR2_archs38
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endchoice
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config BR2_ARC_PAGE_SIZE
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string
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default "4K" if BR2_ARC_PAGE_SIZE_4K
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default "8K" if BR2_ARC_PAGE_SIZE_8K
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default "16K" if BR2_ARC_PAGE_SIZE_16K
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