+ uint32_t desc_start = (uint32_t)desc_p;
+ uint32_t desc_end = desc_start +
+ roundup(sizeof(*desc_p), ARCH_DMA_MINALIGN);
+ uint32_t data_start = (uint32_t)desc_p->dmamac_addr;
+ uint32_t data_end = data_start +
+ roundup(length, ARCH_DMA_MINALIGN);