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The variable 'KERNEL_ARCH' is actually a normalized version of
'ARCH'/'BR2_ARCH'. For example, 'arcle' and 'arceb' both become 'arc', just
as all powerpc variants become 'powerpc'.
It is presumably called 'KERNEL_ARCH' because the Linux kernel is typically
the first place where support for a new architecture is added, and thus is
the entity that defines the normalized name.
However, the term 'KERNEL_ARCH' can also be interpreted as 'the architecture
used by the kernel', which need not be exactly the same as 'the normalized
name for a certain arch'. In particular, for cases where a 64-bit
architecture is running a 64-bit kernel but 32-bit userspace. Examples
include:
* aarch64 architecture, with aarch64 kernel and 32-bit (ARM) userspace
* x86_64 architecture, with x86_64 kernel and 32-bit (i386) userspace
In such cases, the 'architecture used by the kernel' needs to refer to the
64-bit name (aarch64, x86_64), whereas all userspace applications need to
refer the, potentially normalized, 32-bit name.
This means that there need to be two different variables:
KERNEL_ARCH: the architecture used by the kernel
NORMALIZED_ARCH: the normalized name for the current userspace architecture
At this moment, both will actually have the same content. But a subsequent
patch will add basic support for situations described above, in which
KERNEL_ARCH may become overwritten to the 64-bit architecture, while
NORMALIZED_ARCH needs to remain the same (32-bit) case.
This commit replaces use of KERNEL_ARCH where actually the userspace arch is
needed. Places that use KERNEL_ARCH in combination with building of kernel
modules are not touched.
There may be cases where a package builds both a kernel module as userspace,
in which case it may need to know about both KERNEL_ARCH and
NORMALIZED_ARCH, for the case where they differ. But this is to be fixed on
a per-need basis.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Arnout: Also rename BR2_KERNEL_ARCH to BR2_NORMALIZED_ARCH]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
130 lines
3.1 KiB
Plaintext
130 lines
3.1 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 32-bit multiplier. Also it corresponds to the
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default configuration in older GNU toolchain versions.
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config BR2_archs38_64mpy
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bool "ARC HS38 with 64-bit mpy"
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help
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Fully featured ARC HS capable of running Linux, i.e. with
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MMU, caches and 64-bit multiplier.
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If you're not sure which version of ARC HS core you build
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for use 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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config BR2_archs4x_rel31
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bool "ARC HS48 rel 31"
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help
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Build for HS48 release 3.1
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config BR2_archs4x
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bool "ARC HS48"
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help
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Latest release of HS48 processor
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- Dual and Quad multiply and MAC operations
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- Double-precision FPU
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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
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default y if BR2_archs38 || BR2_archs38_64mpy || BR2_archs38_full
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default y if BR2_archs4x_rel31 || BR2_archs4x
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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_NORMALIZED_ARCH
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default "arc"
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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" if BR2_archs38_64mpy
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default "hs38_linux" if BR2_archs38_full
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default "hs4x_rel31" if BR2_archs4x_rel31
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default "hs4x" if BR2_archs4x
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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_64mpy || BR2_archs38_full
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default "ARCv2" if BR2_archs4x_rel31 || BR2_archs4x
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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_arc750d
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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_arc750d
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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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