Hi all, my name is Angelo and I have a problem with some Pericom Serial boards. This hardware is compatible to 16C550 but is not working good. Now I can workaround the problem, I understand it but I'm not able to make some patch for the serial driver inside the linux kernel. So, now I want try to explain the problems and if you can adjust the driver also for this device will be great; or if you can explain me with some example how I can do it and send to you the patch ..... Anyway, the problem is related to Pericom serial boards, pci-id: 12d8:7952 (2 serials) 12d8:7954 (4 serials) 12d8:7958 (8 serials) The first problem is related to the kind of the serial ports. This hardware can be 232-422-4852W-4854W mode, and must be set inside the PCI express registers at the offset b4h. For example if you have a 2 serial port 485-2W board, before use it you must set that register to 0xFF ( I make this with setpci command and all is ok) Te second problem, more critical for me, is the bps setting. The board that I want use have on board a 14.7456 Mhz, and there are a table inside datasheet with the configuration example and the formula to set proper bps settings. The problem is related to the standard linux driver that use the clock equal to 1.8432 MHz. So every time that I open the serial, this bps isn't correct. I must adjust it writing inside the registers (after open) to fix the problem. Is possible add this kind of board inside the standard linux driver to have a good bps setting ? En example, to set 115200bps: Standard linux driver: DLL:0x1 DLH:0x0 Pericom formula: DLL:0x8 DLH:0x0 (Ref. PI7C9X7952/4/8 (Datasheet)) Thanks, best regards Angelo -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
