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We used to build everything for pretty much baseline ARC HS capable of runnig Linux kernel, which was ARC HS38/48 with MMU and caches. But there's a fully featured ARC HS with additional support for - Dual & quad integer multiply and MAC operations - Double-precision floating-point unit It corresponds to the following ARC HS templates in ARChitect: hs38_slc_full. In fact existing HSDK board uses exactly this configuration in its SoC and this is recommended configuration for Linux use-cases. To make life simpler we have corresponding "-mcpu" and "--with-cpu" options in ARC GCC port so we're going to use it and get binaries built accordingly optimized. And while at it added help message so users may better understand what they are dealing with. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Cc: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
103 lines
2.5 KiB
Plaintext
103 lines
2.5 KiB
Plaintext
choice
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prompt "Target CPU"
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default BR2_arc770d
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depends on BR2_arc
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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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help
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Generic ARC HS capable of running Linux, i.e. with MMU,
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caches and multiplier. Also it corresponds to the default
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configuration in older GNU toolchain versions.
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If you're not sure which version of ARC HS core you build for
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keep this one.
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config BR2_archs38_full
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bool "ARC HS38 with Quad MAC & FPU"
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help
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Fully featured ARC HS with additional support for
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- Dual- and quad multiply and MC oprations
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- Double-precision FPU
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It corresponds to "hs38_slc_full" ARC HS template in
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ARChitect.
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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 || BR2_archs38_full
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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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default "hs38_linux" if BR2_archs38_full
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config BR2_READELF_ARCH_NAME
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default "ARCompact" if BR2_arc750d || BR2_arc770d
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default "ARCv2" if BR2_archs38 || BR2_archs38_full
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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 || BR2_archs38_full
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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 || BR2_archs38_full
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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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# vim: ft=kconfig
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# -*- mode:kconfig; -*-
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