dd8a410eaf
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>
53 lines
1,009 B
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53 lines
1,009 B
Plaintext
choice
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prompt "Target Architecture Variant"
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default BR2_ck610
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help
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Specific CPU variant to use
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config BR2_ck610
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# Not supported by upstream gcc <= 9, and handled as a special
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# exception in package/gcc/Config.in.host
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bool "ck610"
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config BR2_ck807
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bool "ck807"
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config BR2_ck810
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bool "ck810"
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config BR2_ck860
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bool "ck860"
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endchoice
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config BR2_CSKY_FPU
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bool "Enable FPU coprocessor"
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depends on BR2_ck810 || BR2_ck807 || BR2_ck860
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help
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You can say N here if your C-SKY CPU doesn't have a
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Floating-Point Coprocessor or if you don't need FPU support
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for your user-space programs.
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config BR2_CSKY_VDSP
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bool "Enable VDSP enhanced instructions Co-processor"
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depends on BR2_CSKY_FPU
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config BR2_GCC_TARGET_FLOAT_ABI
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default "soft" if !BR2_CSKY_FPU
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default "hard" if BR2_CSKY_FPU
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config BR2_ARCH
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default "csky"
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config BR2_NORMALIZED_ARCH
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default "csky"
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config BR2_ENDIAN
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default "LITTLE"
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config BR2_READELF_ARCH_NAME
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default "CSKY"
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# vim: ft=kconfig
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# -*- mode:kconfig; -*-
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