Hi Oreoluwa, We observed a CMA regression issue on MX8MN that the CMA region failed to be setup by rmem_cma_setup() since the following patch: f2a524d9ef5b ("of: reserved_mem: Restructure code to call reserved mem init functions earlier") [1] And the CMA node was incorrect parsed (e.g. non-reuseable) due to NULL node pointer. Below is one line boot log tested with the tag next-20240703 of linux-next tree. OF: reserved mem: 0x0000000058000000..0x000000007fffffff (655360 KiB) map non-reusable linux,cma NOTE: actually there is a reusable property: linux,cma { compatible = "shared-dma-pool"; reusable; size = <0 0x28000000>; alloc-ranges = <0 0x40000000 0 0x40000000>; linux,cma-default; }; The root cause was that the CMA region was initialized at a very early stage since above commit in question. The call flow became: early_init_fdt_scan_reserved_mem()->fdt_scan_reserved_mem()-> __reserved_mem_alloc_size()->of_reserved_mem_save_node(NULL, xxx)-> of_init_reserved_mem_node()->__reserved_mem_init_node(). The rmem->dev_node is still NULL when calling __reserved_mem_init_node() which fails to call the rmem_cma_setup(). Please let me know if there's already a fix patch. [1] https://lore.kernel.org/all/20240620001027.2326275-1-quic_obabatun@xxxxxxxxxxx/ Regards Aisheng