commit | 3c8afccabc4622a5e16a2a75474c8c9bb82f248c | [log] [tgz] |
---|---|---|
author | Per Åstrand <per.astrand@arm.com> | Tue Oct 20 10:29:59 2020 +0200 |
committer | Per Åstrand <per.astrand@arm.com> | Mon Nov 16 10:53:59 2020 +0100 |
tree | 67572fe1cf6f03de25ba2f08b032129136c561d5 | |
parent | 4c94b30eb19f168a5e81e27a26c8e25bdab005b1 [diff] |
Flush and invalidate data caches Implement a weak linked function to handle the data cache. If the specific device is implementing a data cache the function should be overriden with device specific implementation of the flush/invalidate functions to make sure that the cache is properly maintained with regards to the NPU DMA transaction. Change-Id: I175644ef37bee62cc77d789d2b7bc3073e72ea5a
This repository contains a device driver for the Arm Ethos-U NPU.
The source code comes with a CMake based build system. The driver is expeced to be cross compiled for any of the supported Arm Cortex-m CPUs, which will require the user to setup a custom toolchain file.
The user is also required to define CMAKE_SYSTEM_PROCESSOR
for the target CPU, for example cortex-m55+nodsp+nofp. This can be done either in the toolchain file or on the command line.
$ mkdir build $ cd build $ cmake .. -DCMAKE_TOOLCHAIN_FILE=<toolchain> -DCMAKE_SYSTEM_PROCESSOR=cortex-m<nr><features> $ make
For running the driver on Arm CPUs which are configured with datacache, the cache maintenance functions in the driver are exported with weakly linked symbols that should be overriden. An example implementation using the CMSIS primitives found in cachel1_armv7.h could be as below:
extern "C" { void ethosu_flush_dcache(uint32_t *p, size_t bytes) { if (p) SCB_CleanDCache_by_Addr(p, bytes); else SCB_CleanDCache(); } void ethosu_invalidate_dcache(uint32_t *p, size_t bytes) { if (p) SCB_InvalidateDCache_by_Addr(p, bytes); else SCB_InvalidateDCache(); } }
The Arm Ethos-U Core Driver is provided under an Apache-2.0 license. Please see LICENSE.txt for more information.
The Arm Ethos-U project welcomes contributions under the Apache-2.0 license.
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Author: John Doe \<john.doe@example.org\> Date: Mon Feb 29 12:12:12 2016 +0000 Title of the commit Short description of the change. Signed-off-by: John Doe john.doe@example.org Signed-off-by: Foo Bar foo.bar@example.org
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