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Original question:

AM2432: WARNING: RPMessage_send:265: [IPC RPMSG] Message send to remote core 1 @ 7 end point failed due to lack of space...

MCU-PLUS-SDK-AM243X: [IPC RPMSG] Message send to remote core x @ y end point failed due to lack of space in vring

Traveler Hauptman
Prodigy 240 points
Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: SYSCONFIG

Just a little breadcrumb for others...

The IPC RPMessage documentation does not show the full setup for IPC RPMessage. The R5F needs an additional MPU Region. There is a brief note in the 'important' section, but not the corresponding code:

Either add a mpu region via sysconfig, or setup manually. Since the SDK examples are all without SysConfig, the documentation should show something like:
MpuP_RegionAttrs regionParams;
uint32_t regionId = 0;
/* recommend to disable Cache and MPU before setting up MPU regions */
CacheP_disable(CacheP_TYPE_ALL);
MpuP_disable();
/* make all 4G as strongly ordered, non-cacheable */
MpuP_RegionAttrs_init(&regionParams);
regionParams.isEnable = 1;
regionParams.isCacheable = 0;
regionParams.isBufferable = 0;
regionParams.isSharable = 1;
regionParams.isExecuteNever = 1; /* dont allow code execution */
regionParams.tex = 1;
regionParams.accessPerm =MpuP_AP_ALL_RW
;
MpuP_setRegion(regionId, (void*)0x701D0000u, MpuP_RegionSize_64K, &regionParams);
regionId++;

or the sysconfig equivalent:

mpu_armv77.$name = "CONFIG_MPU_IPC_RPMESSAGE";
mpu_armv77.allowExecute = false;
mpu_armv77.baseAddr = 0x701D0000;
mpu_armv77.size = 16;
mpu_armv77.attributes = "NonCached";