Camera does not work properly on board with more than 4GB of memory. After the memory is upgraded from 4GB to 8GB, open the camera APP, the terminal will output:

[  100.488782] rga_mm: RGA_MMU unsupported Memory larger than 4G!
[  100.488814] rga_mm: scheduler core[4] unsupported mm_flag[0x0]!
[  100.488821] rga_mm: rga_mm_map_buffer map dma_buf error!
[  100.488826] rga_mm: job buffer map failed!
[  100.488831] rga_mm: dst channel map job buffer failed!
[  100.488834] rga_mm: failed to map buffer
[  100.488842] rga_job: rga_job_commit: failed to map job info
[  100.488896] rga_job: request[1] task[0] job_commit failed.
[  100.488909] rga_job: rga request commit failed!
[  100.488915] rga: request[1] submit failed!

Solution: Modify the source code according to the file ddr_than-4G.patch and compile it again.