Reserved memory
来自百问网嵌入式Linux wiki
Zhouyuebiao（讨论 | 贡献）2020年5月7日 (四) 23:54的版本 （创建页面，内容为“== Article purpose == The '''Reserved-memory''' mechanism<ref>https://www.kernel.org/doc/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt</ref>…”）
Article purpose
The Reserved-memory mechanism[1] allows reserving memory regions in the kernel. This mechanism is used by drivers to allocate buffers in specific memory regions (such as MCU SRAM) or to get a dedicated memory pool that will not be managed by Linux® conventionnal memory allocator (in DDR).
Use cases
In STM32 MPU Linux OS, the reserved-memory is used by:
- the dmaengine driver to reserve the region where DMA buffers are allocated, typically MCU SRAM.
- the remoteproc driver to reserve the regions in RETRAM and MCU SRAM where the coprocessor firmware will be loaded.
- the RPMsg driver to reserve the region where RPMsg buffers used for interprocess communication with the coprocessor, are allocated, typically MCU SRAM.
- the Vivante Gcnano driver to reserve the region where the GPU working memory is allocated, typically the DDR.
References
<securetransclude src="ProtectedTemplate:PublicationRequestId" params="8903 | 2018-09-25 - AnneJ |"></securetransclude>
