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Add ioctl for reading sdb buffer physical address.#8

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mcarlin-ds wants to merge 7943 commits intoSTMicroelectronics:v5.10-stm32mpfrom
DatumSystems:rpmsg-report-physaddr
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Add ioctl for reading sdb buffer physical address.#8
mcarlin-ds wants to merge 7943 commits intoSTMicroelectronics:v5.10-stm32mpfrom
DatumSystems:rpmsg-report-physaddr

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This is needed for our scheme to use the rpmsg virtio tty devices for CM4 communication. Allows the CM4 to read/write data in the shared buffer.

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