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CONFIG_ALIGNMENT_TRAP

General informations

The Linux kernel configuration item CONFIG_ALIGNMENT_TRAP has multiple definitions:

found in arch/arm/Kconfig

The configuration item CONFIG_ALIGNMENT_TRAP:

• prompt:
• type: bool
• depends on: ( CONFIG_CPU_CP15_MMU ) && (! CONFIG_ARCH_EBSA110 )
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.0–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

ARM processors cannot fetch/store information which is not naturally aligned on the bus, i.e., a 4 byte fetch must start at an address divisible by 4. On 32-bit ARM processors, these non-aligned fetch/store instructions will be emulated in software if you say here, which has a severe performance impact. This is necessary for correct operation of some network protocols. With an IP-only configuration it is safe to say N, otherwise say Y.

found in arch/unicore32/Kconfig

The configuration item CONFIG_ALIGNMENT_TRAP:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/unicore32/Kconfig
• found in Linux kernels: 2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

Unicore processors can not fetch/store information which is not naturally aligned on the bus, i.e., a 4 byte fetch must start at an address divisible by 4. On 32-bit Unicore processors, these non-aligned fetch/store instructions will be emulated in software if you say here, which has a severe performance impact. This is necessary for correct operation of some network protocols. With an IP-only configuration it is safe to say N, otherwise say Y.

Hardware

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Sources

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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