Rpmsg Shared memory in DDR

jk_vikramjk — Thu, 16 Jan 2020 10:47:41 GMT

Hello Nxp,

I am using IMX8 processor and working at M4 side. I am using Rpmsg protocol to communicate A35 - M4 and rpmsg shared memory is pointed to DDR memory.

Before the Rpmsg driver initialization function is called I see there is lot of junk values on DDR shared memory.
My question is
1) this Junk values will cause any effect on the message tx or rx ?
2) Do I need to clear the shared memory to zero before the rpmsg driver is initialized?

Thanks

Re: Rpmsg Shared memory in DDR

igorpadykov — Thu, 16 Jan 2020 23:34:28 GMT

Hi VJK

one can look at rpmsg driver description in Linux 4.19.35_1.1.0 Documentation

In general there is no need clear to shared memory. Also may be useful to check

various aspects of allocating memory described below

reserve_m4_memory.docx

Best regards
igor
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Rpmsg Shared memory in DDR

Re: Rpmsg Shared memory in DDR