I just picked up a Lanner LEC-2010P, which is a fanless embedded Atom N270 industrial control system. It seems to work just fine so far, overall. Since the N270 isn't all that new, I was a bit surprised though to find that its hardware watchdog wasn't detected (no criticism implied).
The user manual for the LEC-2010P shows sample code for talking to the watchdog of the Winbond W83697UHG (just C source intended to be run under MS Windows). I've also managed to locate a data sheet for the W83697UHG. Both the manual and the data sheet are available on request. dmesg below (and sent to dmesg@) Devin OpenBSD 5.3 (GENERIC.MP) #58: Tue Mar 12 18:43:53 MDT 2013 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP cpu0: Genuine Intel(R) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE,LAHF,PERF real mem = 2138370048 (2039MB) avail mem = 2092429312 (1995MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 05/31/10, BIOS32 rev. 0 @ 0xf0010, SMBIOS rev. 2.4 @ 0xfd230 (28 entries) bios0: vendor American Megatrends Inc. version "080015" date 05/31/2010 acpi0 at bios0: rev 0 acpi0: sleep states S0 S1 S4 S5 acpi0: tables DSDT FACP APIC MCFG OEMB ASF! SSDT acpi0: wakeup devices P0P2(S4) P0P1(S4) USB0(S4) USB1(S4) USB2(S4) USB3(S4) EUSB(S4) MC97(S4) P0P4(S4) P0P5(S4) P0P6(S4) P0P7(S4) P0P8(S4) P0P9(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 133MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: Genuine Intel(R) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE,LAHF,PERF ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins ioapic0: misconfigured as apic 1, remapped to apid 2 acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255 acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 3 (P0P1) acpiprt2 at acpi0: bus 1 (P0P4) acpiprt3 at acpi0: bus 2 (P0P5) acpiprt4 at acpi0: bus -1 (P0P6) acpiprt5 at acpi0: bus -1 (P0P7) acpiprt6 at acpi0: bus -1 (P0P8) acpiprt7 at acpi0: bus -1 (P0P9) acpicpu0 at acpi0: C3, C2, C1, PSS acpicpu1 at acpi0: C3, C2, C1, PSS acpibtn0 at acpi0: SLPB acpibtn1 at acpi0: PWRB bios0: ROM list: 0xc0000/0xec00! cpu0: Enhanced SpeedStep 1597 MHz: speeds: 1600, 1333, 1067, 800 MHz pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel 82945GME Host" rev 0x03 vga1 at pci0 dev 2 function 0 "Intel 82945GME Video" rev 0x03 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) intagp0 at vga1 agp0 at intagp0: aperture at 0xd0000000, size 0x10000000 inteldrm0 at vga1: apic 2 int 16 drm0 at inteldrm0 "Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: msi azalia0: codecs: Realtek ALC888 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 2 int 16 pci1 at ppb0 bus 1 re0 at pci1 dev 0 function 0 "Realtek 8168" rev 0x02: RTL8168C/8111C (0x3c00), apic 2 int 16, address 00:90:0b:28:3f:84 rgephy0 at re0 phy 7: RTL8169S/8110S PHY, rev. 2 ppb1 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x02: apic 2 int 17 pci2 at ppb1 bus 2 re1 at pci2 dev 0 function 0 "Realtek 8168" rev 0x02: RTL8168C/8111C (0x3c00), apic 2 int 17, address 00:90:0b:28:3f:85 rgephy1 at re1 phy 7: RTL8169S/8110S PHY, rev. 2 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 2 int 23 uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 2 int 19 uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 2 int 18 uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 2 int 16 ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 2 int 23 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2 pci3 at ppb2 bus 3 ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02: PM disabled pciide0 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x02: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: <INTEL SSDSA2M040G2GC> wd0: 16-sector PIO, LBA48, 38166MB, 78165360 sectors wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6 wd1 at pciide0 channel 1 drive 0: <TS4GCF150> wd1: 1-sector PIO, LBA, 3823MB, 7831152 sectors wd1(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 5 ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic 2 int 19 iic0 at ichiic0 spdmem0 at iic0 addr 0x51: 1GB DDR2 SDRAM non-parity PC2-4200CL3 SO-DIMM usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at ichpcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo com2 at isa0 port 0x3e8/8 irq 5: ns16550a, 16 byte fifo pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 wbsio0 at isa0 port 0x2e/2: W83627UHG rev 0x32 lm1 at wbsio0 port 0xa10/8: W83627DHG npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 mtrr: Pentium Pro MTRR support uhidev0 at uhub1 port 1 configuration 1 interface 0 "CHESEN PS2 to USB Converter" rev 1.10/0.10 addr 2 uhidev0: iclass 3/1 ukbd0 at uhidev0: 8 variable keys, 6 key codes wskbd1 at ukbd0 mux 1 wskbd1: connecting to wsdisplay0 uhidev1 at uhub1 port 1 configuration 1 interface 1 "CHESEN PS2 to USB Converter" rev 1.10/0.10 addr 2 uhidev1: iclass 3/1, 3 report ids ums0 at uhidev1 reportid 1: 5 buttons, Z dir wsmouse0 at ums0 mux 0 uhid0 at uhidev1 reportid 2: input=1, output=0, feature=0 uhid1 at uhidev1 reportid 3: input=3, output=0, feature=0 vscsi0 at root scsibus0 at vscsi0: 256 targets softraid0 at root scsibus1 at softraid0: 256 targets root on wd1a (cb484b8b8a08d7cb.a) swap on wd1b dump on wd1b