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orion_nand_read_buf uses an inline assembly with the "ldrd" instruction, which is only available from ARMv5 upwards. This used to be fine, since all users have an ARMv5 or ARMv7 CPU, but now we can also build a multiplatform kernel with ARMv4 support enabled in addition to the "kirkwood" (mvebu) platform. This provides an alternative to call the readsl() function that is supposed to have the same effect and is also optimized for performance. I first posted a version of this patch back in 2014, and there was some discussion about it then. This fixes the bugs identified back then and should be a reasonable alternative for the rare corner case. Link: https://patchwork.kernel.org/patch/4144791/ Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> |
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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.