RC is providing misc_device to allow an application access DMA memory by mmap(). Single and discrete dma_write() or dma_read() are OK but immediate and contiguous (pair) dma_write() and dma_read() caused system crash. Pseudo code; write FPGA’s memory bank number through dma_write()...
当DMA控制器监测到dma_req为1且dma_write为0后,将依次进入状态1、状态2、状态3、状态4。在状态4中,其会检查基带芯片的写信号host_dma_wr是否有效,如无效,其将从DMA存储器中读取当前地址的数据,然后再将DMA存储器的地址加1并进入状态5;如 host_dma_wr有效,则DMA控制器将等待一个时钟周期,在下个时钟的上升...
1. 背景 虚拟化场景下，设备的虚拟化有三板斧： ①全模拟：通常指由虚拟化层（通常是Qemu）完全模拟...
Hi,I have a problem with getting a simple AXI-DMA write to work. I'm using a ZnyqBerry board with a linux system (the bsp is created with petalinux).My PL side is looking like this. Basically I have an AXI-DM
DMA copied then all results in one minor loop. But I re-read the RM and saw that every COCO triggers the DMA. SC1 and the PDB were being altered while conversion was still active. By setting DMA to move one result per minor loop, fixing my mistake, it now works as expected. 1 ...
Accordingly, DMA_Write_No_Data operations that are provided sequentially may be completed in a parallel manner on the system bus although the corresponding DMA_Write_With_Data is held until a DMA Exclusive state attaches to the cache line. Also, the DMA_Write_With_Data may be completed out ...
DMA copied then all results in one minor loop. But I re-read the RM and saw that every COCO triggers the DMA. SC1 and the PDB were being altered while conversion was still active. By setting DMA to move one result per minor loop, fixing my mistake, it now works as expected. 1 ...
HAL_I2C_Mem_Write_DMA 发送shutdown 指令,个人感觉,做嵌入式,底层就是datasheet,顶层就是数理逻辑。不管什么芯片,当我们遇到问题时,通过查阅datasheet或上官网基本上都能找到解决方法。然而,这些基本都是英文。所以,英文好对做研发是有很大益处的。不过好在有翻译
Hello All, Are Individual DMA writes to coherent memory atomic OR is it done in discrete chunks (of size cacheline) I am curious to know if DMA
for ddr4 model i have connected the axi DMA through axi smart connect. first i am configuring the Axi DMA for write operation using lite interface. i am able to write into the ddr4 model. if i try to read the ddr4 model by writing the read channel register of axi DMA. i am not ...