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Reserved memory
Revision as of 14:02, 4 November 2021 by Registered User
1 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 internal SRAM[2][3]) or to get a dedicated memory pool that will not be managed by Linux® conventionnal memory allocator (in DDR).
2 Use cases
In OpenSTLinux, the reserved-memory is used:
- On STM32MP1 series by:
- the dmaengine driver to reserve the region where DMA buffers are allocated, typically internal SRAM[2][3].
- On STM32MP15x lines
by:
- 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