mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-08 03:40:35 +09:00
d3a9184773
The 8250 core uses the SCR as a canary to discover if the console has been powered-off. This hardware does not have SCR at offset 7, but an unused register CHAR at a different offset. As long as the character interrupt is disabled, the register access has no impact, so it is useful as an alternative scratch register. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.