Custom BMC card

@EasyNetDev is designing a custom PCIe card to ease debugging and development. WPCM450 chips are thankfully available on Aliexpress for 10-15 USD/EUR apiece.

This card might even turn out to be useful as an actual BMC card for PCs, in addition to being a devboard.

Feature wishlist

• PCIe connection to host
• LPC connection to host (via PCIe-ISA-LPC bridge?)
• UART and JTAG exposed via USB (FT2232H)
• USB port for keyboard/mouse and virtual media emulation
• VGA out
• Ethernet
• SD Card slot (if the WPCM450-D chip variant is used)
• Host power control and sensing
  • A pin header to allow connecting the card to a mainboard's power button port, and ideally also the original power button (so that power can be controlled manually and by BMC software)
  • some way to detect if the host is on (PCIe 3.3V connected to a GPIO?)
  • WAKE# control
• Status LED(s)
• GPIO(s) for free use
• Secondary SPI for free use
  • and/or Graphics ROM SPI (DIP-8 flash socket?)
• Fan connectors (PWM and tachometer)
• power supply options
  • running off 3.3Vaux (the standby power rail in PCIe)
  • running off USB power (convenient if you don't have a whole mainboard at hand)
• reset button
• maybe: supporting the UART1 flash programming protocol. this needs:
  • UART 1 exposed (with or without a USB bridge)
  • a button or switch on STRAP12 (STRAP12=0: boot via UART1, STRAP12=1: boot via SPI flash)
  • STRAP8=1, to route UART1 to external pins (rather than the integrated host UART), when the flash programming protocol is used