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Two carveout reserved memory nodes each have been added for each of the C66x DSP remote processor devices present within the MAIN voltage domain for the TI J721E EVM boards. These nodes are assigned to the respective rproc device nodes as well. The first region will be used as the DMA pool for the rproc devices, and the second region will furnish the static carveout regions for the firmware memory. The minimum granularity on the Cache settings on C66x DSP cores is 16 MB, so the DMA memory regions are chosen such that they are in separate 16 MB regions for each DSP, while reserving a total of 16 MB for each DSP and not changing the overall DSP remoteproc carveouts. The current carveout addresses and sizes are defined statically for each device. The C66x DSP processors do not have an MMU, and as such require the exact memory used by the firmwares to be set-aside. The firmware images do not require any RSC_CARVEOUT entries in their resource tables to allocate the memory for firmware memory segments. The reserved memory nodes can be disabled later on if there is no use-case defined to use the corresponding remote processor. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Nishanth Menon <nm@ti.com> Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com> Link: https://lore.kernel.org/r/20200825172145.13186-5-s-anna@ti.com |
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