Hi, Given the NDA nature it's tricky trying to support the watchdog and serial port for LinuxBIOS. I think I can fly blind using parts of publicly available datasheets, but it would save me time if I knew the Logical Device #'s of the various superio modules, ie index 7 values needed to address parport, serial 1/2, fdc, etc. config registers. Any chance someone can hint at what these might be, or a publicly available datasheet that's closest: http://www.smsc.com/main/datasheet.html Ok so they all have serial port as Logical Device 4, so I've summarized what the watchdog uses below. ISA bus types - Config index/data registers at 0x3F0 or 0x370 watchdog uses configuration space of logical device FDC37b727 Logical Device 8 - Aux I/O 0xF1 - 0xF4 watchdog * FDC37b78x Logical Device 8 - Aux I/O 0xF1 - 0xF4 watchdog * FDC37c665GT very different - no logical devices FDC37c669 very different - no logical devices FDC37c672 Logical Device 8 - Aux I/O 0xF1 - 0xF4 watchdog * no WDT_TIME_OUT register FDC37c78 FDC only FDC37c93x Logical Device 8 - Aux I/O 0xF2 - 0xF4 watchdog * FDC37M707 Logical Device 8 - Aux I/O 0xF1 - 0xF4 watchdog * FDC37m817 Logical Device 8 - Aux I/O 0xF1 - 0xF4 watchdog * FDC37n769 very different - no logical devices * can be configured to allow access to some watchdog registers while in run mode LPC bus types - index/address registers 0x2e/0x2f or 0x4e/0x4f watchdog uses offset from decoded address set by logical device Primary Base Address LPC47b272 Logical Device A - Runtime reg offset 0x52 - 0x55 watchdog LPC47m10x no WDT LPC47m112 no WDT LPC47m172 no WDT LPC47S45x Logical Device A - Runtime reg offset 0x52 - 0x55 watchdog I'm leaning towards DME1737 being the same as these LPC parts. -- Jeremy Jackson jerj at coplanar.net Email/Jabber/Google Talk/MSN (519)489-4903 Coplanar Networks http://www.coplanar.net