Hi Armbian Community,
I am trying to get the Coral/Google NPU (M.2 PCIe key) to work with the NanoPC-T4. Without success.
I built Armbian with linux headers (5.4.48) and was able to apt install the gasket-dkms package. (The EdgeTPU requires Google's Gasket and Apex drivers to be built as modules with DKMS, and thus requires the linux headers to be installed at /usr/src). Also, there was no conflicting Gasket or Apex module in the Armbian release prior to install (an issue found by other EdgeTPU systems on other distros).
My problem, I believe, has to do with the NanoPC-T4's PCIe. I have tried many different kernels (FriendlyElec's Core/Desktop/Buildroot releases using Rockchip's 4.4.179 kernel as well as various Armbian), and every time PCIe link training times out as follows:
[ 3.161132] rockchip-pcie f8000000.pcie: PCIe link training gen1 timeout!
[ 3.161214] rockchip-pcie: probe of f8000000.pcie failed with error -110
I am currently at a loss for what to try next. If anyone has any ideas, then I would be forever grateful and enthusiastic to help debug and test.
Here is the full u-boot debug and kernel dmesg output for the Armbian build with Gasket/Apex modules installed (albeit never probed):
