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AM5728: CMEM how to release busy bufs

Part Number: AM5728

Hi

These days, I met some troubles that how to release the cache. When I run the big_data_ipc_example. Its logs:

App_create: Host is ready[ 3565.858136] CMEMK Error: Failed to find a pool which fits 0x1000000

<-- App_create:
--> App_exec:
CMEM_init success
CMEM Error: getPool: Failed to get a pool fitting a size 0x1000000
CMEM_getPool failed
Segmentation fault (core dumped)

Then I call cat /proc/cmem 

Block 0: Pool 0: 1 bufs size 0xc000000 (0xc000000 requested)

Pool 0 busy bufs:
id 0: phys addr 0xa0000000 (cached)

How to release it that I can continue run the demo?

SDK:06.03.00.106

Ubuntu 18.04

Thanks!