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.
Max Marrone
authored
This is a workaround for what we suspect is an undocumented silicon erratum in the RV-3028 RTC. It adds an artificial sleep whenever something reads the current time from the RTC's registers. Whenever there is an open I2C transaction, the RV-3028 will hold its time registers steady, in order to avoid a torn read/write hazard. If the time registers would have ticked to a new value during that transaction, the RV-3028 is supposed to postpone that update and apply it as soon as the transaction ends. But on some boards, we're seeing the time registers never update at all whenever they're under rapid polling. `hwclock` does rapid polling under normal usage, so this causes it to error with "Timed out waiting for time change". We theorize that problematic RV-3028 chips need a big block of idle bus time in order to apply postponed time updates. We sleep for 2-4 milliseconds. Shorter sleeps might also work; we just haven't tested with them. This patch was adapted from: https://github.com/Opentrons/buildroot/blob/v1.11.0/board/opentrons/ot2/kernel-patches/0008-Work-around-rv3028-problems-via-artificial-delay.patch Signed-off-by:Frieder Schrempf <frieder.schrempf@kontron.de>
| Name | Last commit | Last update |
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README |