Document API UP1100 mainboard which is reported to work fine with FreeBSD.

UP1100 owners are invited to comment on the info provided here.

release/texts/alpha/HARDWARE.TXT

@@ -1618,7 +1618,7 @@ contain:
         cpu             EV5 
 
 *
-* Alpha Processor Inc. UP1000
+* Alpha Processor Inc. UP1100
 *
 
 The UP1000 is an ATX mainboard based on the 21264a CPU which itself lives in
@@ -1679,6 +1679,63 @@ based on the Symbios chips that the sym driver supports will work as well.
 USB:
 Is disabled by the SRM console and has not (yet) been tested with FreeBSD.
 
+*
+* Alpha Processor Inc. UP1100
+*
+
+The UP1100 is an ATX mainboard based on the 21264a CPU running at 600 MHz.
+It is normally housed in a ATX [mini]tower enclosure.
+
+Features:
+- 21264a Alpha CPU at 600 MHz
+- memory bus: 100MHz 64-bit 
+- on-board Bcache / L2 cache: 2Mb 
+- AMD AMD-751 ('Irongate') system controller chip
+- Acer Labs M1535D PCI-ISA bridge controller / super-IO chip
+- PS/2 mouse & keyboard port
+- memory: 168-pin PC100 unbuffered SDRAM DIMMS
+          3 DIMM slots
+          DIMM sizes supported are 64, 128 or 256 Mb in size
+- 2x 16550A serial port
+- 1x ECP/EPP parallel port
+- floppy interface
+- 2x embedded Ultra DMA33 IDE interface
+- 2x USB port
+- expansion: 3 32 bit PCI slots
+             1 AGP2x slot
+
+Console:
+SRM console code comes standard with the UP1100. The SRM lives in 2Mbytes of
+flash ROM.
+
+Memory:
+The machine needs ECC capable DIMMs, so 72 bit ones. This does not appear to
+be documented in the UP1000 docs. The system accesses the serial EEPROM on
+the DIMMs via the SM bus. Note that if only a single DIMM is used it must be
+installed in slot *2*. This is a bit counter-intuitive.
+
+Power
+The UP1000 needs a 400Watt ATX power supply according to the manufacturer.
+This might be a bit overly conservative/pessimistic judging from the power
+consumption of the board & cpu. But as always you will have to take your
+expansion cards and peripherals into account. The M1535D chip contains power
+management functionality & temperature monitoring (via I2C / SM bus using
+a LM75 thermal sensor).
+
+Network:
+The UP1100 has an on-board 21143 10/100Mbit ethernet interface.
+
+Sound:
+The UP1100 is equipped with a SoundBlaster compatible audio interface.
+Whether this works with FreeBSD is as of yet unknown.
+
+EIDE:
+The embedded Ultra DMA EIDE ports are bootable by the SRM console.
+
+USB:
+The UP1100 has 3 USB ports, 2 going external and one connected to the 
+AGP port.
+
 Supported hardware overview
 ---------------------------