Hailo-8 integration into ZynqMP

General
,
1

Hello everyone,

I am trying to integrate hailo ai chip into my custom zynqMPSoC board into the M.2 connector. I am facing issue in detecting hailo after booting Linux on FPGA.
I check the pin out of FPGA M.2 connector

image
image211×244 9.46 KB

In comparison to Hailo-8 M.2 pinout, the FPGA configuration is missing two signals, namely wake and clk_req. Does Hailo-8 detection depend on these signals or are they optional?
Please suggest.
Any help is much approeciated.

Best regards,
NS

2

Hey @Nupur_Sumeet ,

Quick answer: You can totally skip CLKREQ# and PEWAKE# - they’re just optional power management features and won’t prevent your Hailo-8 from showing up in Linux.

Why you can ignore them:

The CLKREQ# pin is only used if the card wants to turn off its reference clock when it’s not doing anything (saves a bit of power). If you don’t connect it, the clock just stays on all the time - no big deal.

PEWAKE# is for waking the system up from sleep mode. It doesn’t affect the initial boot-up process at all.

What you actually need:

To get your Hailo-8 working on your Zynq MPSoC, focus on these essentials:

  • Solid 3.3V power on the Vcc and Vaux pins
  • A clean 50MHz or 100MHz differential reference clock on the REFCLK_P/N pins
  • Proper PERST# reset sequence (pull it low for at least 100ns, then high)
  • The four PCIe data lanes wired correctly

Get those right and lspci should immediately show your Hailo-8. No need to mess with the power management stuff.

Simple approach:

  • CLKREQ#: Just leave it floating (there’s an internal pull-up) or tie it high to 3.3V
  • PEWAKE#: Leave floating (internal pull-down) or tie to ground
  • Double-check your PERST# timing and reference clock with a scope
  • Make sure all your power rails are stable before releasing PERST#

Once that’s sorted, Linux should pick up your Hailo-8 without any issues. The power management pins are nice-to-have features, not deal-breakers.