dma
Does a DMA controller have its own registers?
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.[详细]
2023-04-13 02:07 分类：问答Ensuring that memory cache is properly invalidated
So I have a piece of code that looks like the following: uint8_t *buffer = <16 MB memory region>[详细]
2023-04-09 05:42 分类：问答DMA copy in splice()
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:[详细]
2023-04-08 03:41 分类：问答How to write kernel space memory (physical address) to a file using O_DIRECT?
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.[详细]
2023-03-14 11:29 分类：问答Best way to transfer video data to a device over PCI in linux
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[详细]
2023-03-11 08:34 分类：问答Linux kernel device driver to DMA into kernel space
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);[详细]
2023-02-22 23:31 分类：问答Can a Linux device driver wait for a DMA to terminate in the device_remove() function?
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.[详细]
2022-12-29 20:36 分类：问答What happens after a packet is captured?
I\'ve been reading about what happens after packets are captured by NICs, and the more I read, the more I\'m confused.[详细]
2022-12-25 15:13 分类：问答Where to start learning about linux DMA / device drivers / memory allocation
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.[详细]
2022-12-22 05:00 分类：问答cache - flush and invalidate operation
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.[详细]
2022-12-20 17:45 分类：问答
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