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''''''pi@raspberrypi:~ $ dmesg | grep cma'''
C779
,2、Use "dmesg | grep CMA" to check the amount of memory allocated to the CMA heap.
'''[ 0.000000] cma: Reserved 256 MiB at 0x000000001ec00000''''''
If the report has less than 96MB of files assigned to CMA, edit / boot / config.txt and add.