Hi, I am modifying the bt848 driver to accomodate 4 cameras. The driver will eventually be used on an custom CPU board. The scenario is as follow: The brooktree is attached to at least 2 cameras. The driver will switch between the two inputs and the grabbed buffer will be compressed by a client program. The scheduling list is as below: 0 1 0 1 0 1 0 1 0 1 0 - first camera 1 - second camera I try to capture one input while compressing another input. This way a frame buffer can always be ready instead of letting the encoder process stays in idle while waiting for the frame grabber to grab the next frame from the other input. In short, I try to capture one frame buffer in advance. The problem is when I tried to do this, FIFO over run condition occurs (interrupt - FBUS). According to the manual, it is due to fact that the PCI initiator cannot gain control of the PCI bus, and the DMA controller is not able to execute the necessary WRITE instructions. I tried to turn of the FIFO and the DMA engine, and turned on FIFO again, but it is not working. The driver does not seem to be able to switch camera because it will always be trapped inside the interrupt routine. I wonder if anyone any solutions or ideas on how I can solve the problem? Thanks in advance. regards, chuan foong
