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Use of SVE by EL2 and below requires explicit support in the firmware. There is no means to hide the presence of SVE from EL2, so a kernel configured with CONFIG_ARM64_SVE=y will typically not work correctly on SVE capable hardware unless the firmware does include the appropriate support. This is not expected to pose a problem in the wild, since platform integrators are responsible for ensuring that they ship up-to-date firmware to support their hardware. However, developers may hit the issue when using mismatched compoments. In order to draw attention to the issue and how to solve it, this patch adds some Kconfig text giving a brief explanation and details of compatible firmware versions. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.