tjh.dev
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.
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Commit c2ce5fb3f3f5 ('ARM: OMAP: DRA7xx: Make L4SEC clock domain SWSUP
only') made DRA7 SoC L4SEC clock domain SWSUP only because of power
state transition issues detected with HWSUP mode. Based on
experimentation similar issue exists on OMAP5, so do the same change
for OMAP5 also.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Commit c2ce5fb3f3f5 ('ARM: OMAP: DRA7xx: Make L4SEC clock domain SWSUP
only') made DRA7 SoC L4SEC clock domain SWSUP only because of power
state transition issues detected with HWSUP mode. Based on
experimentation similar issue exists on OMAP4, so do the same change
for OMAP4 also.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
OMAP5 contains a single DES crypto accelerator instance. Add node for
this in DT to enable it.
We keep the node disabled for now, as it appears OMAP5 platform is
running out of available DMA channels, and DES is the least interesting
crypto accelerator available on the device.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Add the single available SHA crypto accelerator device for OMAP5 SoC.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
OMAP5 has AES hardware cryptographic accelerator, add AES2 instance for
it.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
OMAP5 has AES hardware cryptographic accelerator, add AES1 instance for
it.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The watchdog timer information has been added to all the IPU and DSP
remote processor device nodes in the DRA7xx/AM57xx SoC families. The
data has been added to the two common dra7-ipu-dsp-common and
dra74-ipu-dsp-common dtsi files that can be included by all the
desired board files. The following timers are chosen as the watchdog
timers, as per the usage on the current firmware images:
IPU2: GPTimers 4 & 9 (one for each Cortex-M4 core)
IPU1: GPTimers 7 & 8 (one for each Cortex-M4 core)
DSP1: GPTimer 10
DSP2: GPTimer 13
Each of the IPUs has two Cortex-M4 processors and so uses a timer
each for providing watchdog support on that processor irrespective of
whether the IPU is running in SMP-mode or non-SMP node. The chosen
timers also need to be unique from the ones used by other processors
(regular timers or watchdog timers) so that they can be supported
simultaneously.
The MPU-side drivers will use this data to initialize the watchdog
timer(s), and listen for any watchdog triggers. The BIOS-side code on
these processors needs to configure/refresh the corresponding timer
properly to not throw a watchdog error.
The watchdog timers are optional in general, but are mandatory to
be added to support watchdog error recovery on a particular processor.
These timers can be changed or removed as per the system integration
needs, alongside appropriate equivalent changes on the firmware side.
Signed-off-by: Angela Stegmaier <angelabaker@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for both the IPUs and the
DSP1 remoteproc devices on the AM571x IDK board. These nodes are assigned
to the respective rproc device nodes, and both the IPUs and the DSP1
remote processors are enabled for this board.
The current CMA pools and sizes are defined statically for each device.
The addresses chosen are the same as the respective processors on the
DRA72 EVM board to maintain firmware compatibility between the two boards.
The CMA pools and sizes are defined using 64-bit values to support LPAE.
The starting addresses are fixed to meet current dependencies on the
remote processor firmwares, and this will go away when the remote-side
code has been improved to gather this information runtime during its
initialization.
An associated pair of the rproc node and its CMA node can be disabled
later on if there is no use-case defined to use that remote processor.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for all the IPU and DSP
remoteproc devices in the am572x-idk-common.dtsi file that is common to
both the AM572x and AM574x IDK boards. These nodes are assigned to the
respective rproc device nodes, and all the IPU and DSP remote processors
are enabled.
The current CMA pools and sizes are defined statically for each device.
The addresses chosen are the same as the respective processors on
the AM57xx EVM board to maintain firmware compatibility between the
two boards. The CMA pools and sizes are defined using 64-bit values
to support LPAE. The starting addresses are fixed to meet current
dependencies on the remote processor firmwares, and this will go
away when the remote-side code has been improved to gather this
information runtime during its initialization.
An associated pair of the rproc node and its CMA node can be disabled
later on if there is no use-case defined to use that remote processor.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for all the IPU and DSP
remoteproc devices on all the AM57xx BeagleBoard-X15 boards. These nodes
are assigned to the respective rproc device nodes, and all the IPU and
DSP remote processors are enabled for all these boards.
The current CMA pools and sizes are defined statically for each device.
The addresses chosen are the same as the respective processors on the
DRA7 EVM board to maintain firmware compatibility between the two boards.
The CMA pools and sizes are defined using 64-bit values to support LPAE.
The starting addresses are fixed to meet current dependencies on the
remote processor firmwares, and this will go away when the remote-side
code has been improved to gather this information runtime during its
initialization.
An associated pair of the rproc node and its CMA node can be disabled
later on if there is no use-case defined to use that remote processor.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for all the IPU and
the DSP remoteproc devices on the DRA76 EVM board, and assigned to
the respective rproc device nodes. These match the configuration
used on the DRA7 EVM board. Both the CMA nodes and the corresponding
rproc nodes are also enabled to enable these processors on the
DRA76 EVM board.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for both the IPUs and the
DSP1 remoteproc devices on DRA71 EVM board. These nodes are assigned to
the respective rproc device nodes, and both the IPUs and the DSP1 remote
processors are enabled for this board.
The current CMA pools and sizes are defined statically for each device.
The addresses chosen are the same as the respective processors on the
DRA72 EVM board to maintain firmware compatibility between the two boards.
The CMA pools and sizes are defined using 64-bit values to support LPAE.
The starting addresses are fixed to meet current dependencies on the
remote processor firmwares, and this will go away when the remote-side
code has been improved to gather this information runtime during its
initialization.
An associated pair of the rproc node and its CMA node can be disabled
later on if there is no use-case defined to use that remote processor.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for both the IPUs and
the DSP1 remoteproc devices on the DRA72 EVM rev C board, and assigned
to the respective rproc device nodes. These match the configuration
used on the DRA72 EVM board. Both the CMA nodes and the corresponding
rproc nodes are also enabled to enable these processors on the
DRA72 EVM rev C board.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
The CMA reserved memory nodes have been added for both the IPUs and the
DSP1 remoteproc devices on DRA72 EVM board. These nodes are assigned to
the respective rproc device nodes, and both the IPUs and the DSP1 remote
processors are enabled for this board.
The current CMA pools and sizes are defined statically for each device.
The addresses chosen are the same as the respective processors on the
DRA7 EVM board to maintain firmware compatibility between the two boards.
The CMA pools and sizes are defined using 64-bit values to support LPAE.
The starting addresses are fixed to meet current dependencies on the
remote processor firmwares, and this will go away when the remote-side
code has been improved to gather this information runtime during its
initialization.
An associated pair of the rproc node and its CMA node can be disabled
later on if there is no use-case defined to use that remote processor.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
README