adding 16550 uarts

I have a proprietary PCI device which has a 12 16550 UART devices
implemented on it.

What's the best way to go about having these devices appear as windows
COM ports?

Is it possible/desirable to configure/adapt/modify/extend the serial
driver sample in the DDK for this purpose? Or is there a better way?

TIA
Regards,
Mark

 

I should also add that this PCI device has other functionality, and will
most likely end up having a driver which attaches several child device
objects, one of them being the uart block.

I don't really understand how that's going to affect how the COM port
driver is hooked up either?!?

Regards,
Mark

 

If the "PCI side" of your device - how 12 functions are laid out - conforms
to the requirements of mf.sys (documented), you can use mf.sys as parent driver
and serial.sys for children.
Otherwise, you will need to write your own bus driver instead of mf.sys.
Without KMDF, it is a major nuisance.

 

I should also add that this PCI device has other functionality, and will

If each UART function is 100% compatible with the old PC UART, and differ from
it only in a way ports/interrupts are numbered - then OK. Otherwise, you will
also need to write your own serial driver, which is _the_ task.

 

I've been told that I can't use serial.sys because the uarts all share a
single interrupt - in fact the interrupt is also shared with other
resources on the PCI card as well.

Looks like it's a bus driver and modify serial.sys - and KMDF...

Thanks for your input!
Regards,
Mark