Verdin Mini RPMSG-Lite Increase Buffer Size

[swiss]

Hi Edward,
Thanks for your answer!

@Edward

which for 512 * 512B buffers … fits in 64k. It can be so only if amount of buffers applies to minimum message length, which would consist of just RPMSG header. So two rings * 16 * 512 = 16k

Wait if I understand you correctly 512x512 is 256kB but the vring size in one direction is only 0x8000 as seen here:

@Edward

See lines 307-308 here

			rpdev->ivdev[i]->vring[0] = start;
			rpdev->ivdev[i]->vring[1] = start + 0x8000;

0x8000 is hardcoded one direction vring size. One ring at start, another ring at start + 0x8000. i is virtual device index.

So the RPMSG_RING_SIZE is not refering to the payload size but rather overhead information?

But let’s go back to the concrete example: If I want to go from 512x512 to 1028x256, should I change the hardcoded 0x8000 ring size? I expected it to work without change because its still 256kB as before.

EDIT: I just changed one print output for debugging (imx_rpmsg.c line 670 “imx rpmsg driver is registered”) but nothing changed, looks like the driver changes are not applied. I might be making some torizoncore builder mistake, I’m looking into it