mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-05 14:09:10 +08:00
2d30fcdd43
Slim Bootloader(SBL) is a small open-source boot firmware, designed for running on certain Intel platforms. SBL can be thought-of as fulfilling the role of a minimal BIOS implementation, i.e initializing the hardware and booting Operating System. Since SBL is not UEFI compliant, firmware update cannot be triggered using standard UEFI runtime services. Further considering performance impact, SBL doesn't look for a firmware update image on every reset and does so only when firmware update signal is asserted. SBL exposes an ACPI-WMI device which comes up in sysfs as /sys/bus/wmi/44FADEB1xxx and this driver adds a "firmware_update_request" device attribute. This attribute normally has a value of 0 and userspace can signal SBL to update firmware, on next reboot, by writing a value of 1 like: echo 1 > /sys/bus/wmi/devices/44FADEB1xxx/firmware_update_request This driver only implements a signaling mechanism, the actual firmware update process and various details like firmware update image format, firmware image location etc are defined by SBL and are not in the scope of this driver. DocLink: https://slimbootloader.github.io/security/firmware-update.html Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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 Restructured Text 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.