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DM8127 CMEM_alloc错误

我装的是RDK3.8,bootargs中的cmemk.phys_start=0x85000000 cmemk.phys_end=0x89000000 cmemk.allowOverlap=1,都是按照默认的

在A8端 CMEM_alloc 了 1920*1080字节的内存,提示申请失败,CMEM Error: allocHeap: ioctl CMEM_IOCALLOCHEAP failed: -1 错误

CMEM的内存不是有64M的吗?为什么申请1920*1080字节就会出错? 是原有的RDK代码中已经把CMEM都申请光了还是要做什么设置?