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This makes various signal and function tests more convenient without the need to modify the DTB. /sys/kernel/debug/mmc0# echo $(($(cat caps) | (1 << 7))) > caps /sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control /sys/kernel/debug/mmc0# echo auto > /sys/bus/mmc/devices/mmc0\:0001/power/control // Disable 8-bit support echo $(($(cat caps) & ~(1 << 6))) > caps // Enable 8-bit support echo $(($(cat caps) | (1 << 6))) > caps // Disable 4-bit support echo $(($(cat caps) & ~(1 << 0))) > caps // Enable 4-bit support echo $(($(cat caps) | (1 << 0))) > caps // Disable CMD23 support echo $(($(cat caps) & ~(1 << 30))) > caps // Enable CMD23 support echo $(($(cat caps) | (1 << 30))) > caps // Disable CMD23 support echo $(($(cat caps) & ~(1 << 30))) > caps // Enable CMD23 support echo $(($(cat caps) | (1 << 30))) > caps // Disable CQE support echo $(($(cat caps2) & ~(1 << 23))) > caps2 // Enable CQE support echo $(($(cat caps2) | (1 << 23))) > caps2 // Disable CQE DCMD support echo $(($(cat caps2) & ~(1 << 24))) > caps2 // Enable CQE DCMD support echo $(($(cat caps2) | (1 << 24))) > caps2 /sys/kernel/debug/mmc0# echo on > /sys/bus/mmc/devices/mmc0\:0001/power/control /sys/kernel/debug/mmc0# cat ios Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.