ACPI: Add acpi=nospcr to disable ACPI SPCR as default console on ARM64

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For varying privacy and security reasons, sometimes we would like to
completely silence the _serial_ console, and only enable it when needed.

But there are many existing systems that depend on this _serial_ console,
so add acpi=nospcr to disable console in ACPI SPCR table as default
_serial_ console.

Signed-off-by: Liu Wei <liuwei09@cestc.cn>
Suggested-by: Prarit Bhargava <prarit@redhat.com>
Suggested-by: Will Deacon <will@kernel.org>
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Prarit Bhargava <prarit@redhat.com>
Link: https://lore.kernel.org/r/20240625030504.58025-1-liuwei09@cestc.cn
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Liu Wei 2024-06-25 11:05:04 +08:00 • committed by Catalin Marinas

parent bfe3f0df3e

commit f5a4af3c75

2 changed files with 24 additions and 4 deletions

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10

Documentation/admin-guide/kernel-parameters.txt

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18

arch/arm64/kernel/acpi.c

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