auth_chunk
struct auth_chunk *auth_chunk;
size_t mapsize, simg_offset = sizeof(struct auth_chunk);
auth_chunk = dma->qdm_dma_vaddr;
auth_chunk->ac_chunk_size = mapsize;
auth_chunk->ac_chunk_bus_addr = dma->qdm_dma_map->dm_segs[0].ds_addr;
bus_addr = auth_chunk->ac_chunk_bus_addr;
auth_desc = &auth_chunk->ac_fw_auth_desc;
sizeof(struct auth_chunk) + sizeof(struct css_hdr) +