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* the [[Linux remoteproc framework overview|remoteproc driver]] to reserve the regions in [[RETRAM internal memory|RETRAM]] and [[MCU SRAM internal memory|MCU SRAM]] where the coprocessor firmware will be loaded. | * the [[Linux remoteproc framework overview|remoteproc driver]] to reserve the regions in [[RETRAM internal memory|RETRAM]] and [[MCU SRAM internal memory|MCU SRAM]] where the coprocessor firmware will be loaded. | ||
* the [[Linux_RPMsg_framework_overview|RPMsg driver]] to reserve the region where [[Linux RPMsg framework overview|RPMsg]] buffers used for interprocess communication with the coprocessor, are allocated, typically [[MCU SRAM internal memory|MCU SRAM]]. | * the [[Linux_RPMsg_framework_overview|RPMsg driver]] to reserve the region where [[Linux RPMsg framework overview|RPMsg]] buffers used for interprocess communication with the coprocessor, are allocated, typically [[MCU SRAM internal memory|MCU SRAM]]. | ||
* the | * the Vivante Gcnano driver to reserve the region where the GPU working memory is allocated, typically the [[DDRCTRL and DDRPHYC internal peripherals|DDR]]. | ||
== References == | == References == | ||
Latest revision as of 19:23, 11 January 2021
1. Article purpose[edit source]
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).
2. Use cases[edit source]
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.
3. References[edit source]