WebOct 14, 2003 · Direct memory access (DMA) is a means of having a peripheral device control a processor’s memory bus directly. DMA permits the peripheral, such as a UART, to transfer data directly to or from … WebDMA-Buffer is a generic kernel level framework to share buffers between different processes or devices like access file. Defines a new buffer object, which provides mechanism for exporting and using shared buffers. …

dma-buf 由浅入深（一） —— 最简单的 dma-buf 驱动程序 ...

WebEasyDMA. EasyDMA is a module implemented by some peripherals to gain direct access to Data RAM. EasyDMA is an AHB bus master similar to CPU and is connected to the AHB multilayer interconnect for direct access to Data RAM. EasyDMA is not able to access flash. A peripheral can implement multiple EasyDMA instances to provide dedicated channels. Web我们可以看到，这3个buffer并不连续，它们Scatter(分散)在内存中的各个地方。 RDMA硬件读取到SGL后，进行Gather(聚合)操作，于是在RDMA硬件的Wire上看到的就是N3+N2+N1个连续的字节。换句话说，通过使用SGL, 我们可以把分散(Scatter)在内存中的多个数据段(不连续)交给RDMA ... falling objects in the workplace

STM32 DMA详解 - 知乎

WebDMA(Direct Memory Access)—直接存储器存取，DMA 控制器独立于内核，结构比较简单，是单片机的一个外设，它的主要功能是用来搬数据，但是不需要占用 CPU，即在传输数据的时候，CPU 可以干其他的事情，好像是多线程一样。2、DMA数据传输我们知道，数据传 … WebUMA能做什么. 对于支持UMA的平台，开发者不需要把内存数据拷贝到显存。. 一方面，这样节省了空间，数据只要保持一份。. 对于移动平台来说，空间非常宝贵，省一倍相当可观了。. 另一方面，这提升了性能，因为不需要拷贝。. 长期以来在任何平台上，开发者 ... WebIt serves as a proxy. * for kernel space DMA control to a user space application. * memory region into user space, referred to as a set of channel buffers. Ioctl functions. * previously started, or start and finish a DMA transfer blocking until it is complete. * transfer is required. * non-cached at this time. controller razor play station 2