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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>
59 lines
1.3 KiB
Plaintext
59 lines
1.3 KiB
Plaintext
choice
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prompt "Target Architecture Variant"
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default BR2_xtensa_fsf
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depends on BR2_xtensa
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config BR2_XTENSA_CUSTOM
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bool "Custom Xtensa processor configuration"
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select BR2_ARCH_HAS_MMU_OPTIONAL
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config BR2_xtensa_fsf
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bool "fsf - Default configuration"
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select BR2_ARCH_HAS_MMU_MANDATORY
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endchoice
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config BR2_XTENSA_OVERLAY_FILE
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string "Overlay file for custom configuration"
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depends on BR2_XTENSA_CUSTOM
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help
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Enter the path to the overlay tarball for a custom processor
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configuration.
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These overlay files are tar packages with updated
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configuration files for various toolchain packages and Xtensa
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processor configurations. They are provided by the processor
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vendor or directly from Tensilica.
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The path can be either absolute, or relative to the top
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directory of buildroot.
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choice
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prompt "Target Architecture Endianness"
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default BR2_XTENSA_LITTLE_ENDIAN
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depends on BR2_XTENSA_CUSTOM
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config BR2_XTENSA_LITTLE_ENDIAN
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bool "Little endian"
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config BR2_XTENSA_BIG_ENDIAN
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bool "Big endian"
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endchoice
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config BR2_ENDIAN
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default "LITTLE" if BR2_XTENSA_LITTLE_ENDIAN
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default "BIG" if BR2_xtensa_fsf || BR2_XTENSA_BIG_ENDIAN
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config BR2_ARCH
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default "xtensa" if BR2_xtensa
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config BR2_NORMALIZED_ARCH
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default "xtensa"
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config BR2_READELF_ARCH_NAME
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default "Tensilica Xtensa Processor"
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# vim: ft=kconfig
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# -*- mode:kconfig; -*-
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