I\'m trying to understand the ins and outs of how a DMA controller functions. I\'m looking at the 8237 DMA controller. Some information here has some tab开发者_JAVA技巧les with register values.
So I have a piece of code that looks like the following: uint8_t *buffer = <16 MB memory region>
I am new to linux kernel. A开发者_StackOverflow中文版nd recently, i\'ve went through the sendfile syscall in kernel 2.6.33. The following is the sequence of my journey:
I want to write a physical memory to a file. The memory itself will not be touched again, thus I want to use O_DIRECT to gain the best write performance.
I need to transfer video data to and from an FPGA device over PCI in a linux environment. I\'m using a third party PCI master core on the FPGA. So far, I\'ve implemented a simple DMA controller on the
LDD3 (p:453) demos dma_map_single using a buffer passed in as a parameter. bus_addr = dma_map_single(&dev->pci_dev->dev, buffer, co开发者_运维问答unt, dev->dma_dir);
I\'ve written a Linux device driver for a PCI device. This device performs DMA operations. An issue arise when the program crashes when a DMA operation is running.
I\'ve been reading about what happens after packets are captured by NICs, and the more I read, the more I\'m confused.
I\'m porting / debugging a device driver (that is used by another kernel module) and facing a dead end because dma_sync_single_for_device() fails with an kernel oops.
I have some questions on cache synchronization operations. Invalidate: Before cpu tries to reada portion of memory updated by a device, the corresponding memory needs to be invalidated.
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