start-config. fails to start

[KristinH]

Four files are attached.
The initial files are what I get immediately after a power cycle. the DIO is showing a red LED, the RevPi a green one.
Then I ran piTest -x, the files suffixed with _good are with both RevPis and DIOs showing green LEDs

[nicolaiB]

Thanks from the kernel log and noticed that your kernel command line

[ 0.000000] Kernel command line: coherent_pool=1M snd_bcm2835.enable_headphones=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_hdmi=0 smsc95xx.macaddr=B8:27:EB:F6:22:28 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 dwc_otg.lpm_enable=0 console=tty1 console=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 fsck.repair=yes rootwait nosplash plymouth.ignore-serial-consoles cfg80211.ieee80211_regdom=GB

contains

console=ttyAMA0,115200

which activates the serial console on the same serial interface the io module communicate with. This leads to garbage on the backplane bus and thus the driver only works after another reset. Did you configure this for any particular reason?

Please remove the above fragment from

/boot/firmware/cmdline.txt

and reboot.

[KristinH]

Thank you. I have removed that and it works now. My mistake, I'm flipping between two Industrial Pi platforms for a technology validation project and must have enabled that on the incorrect platform.

We're on a roll now!

[nicolaiB]

Great to hear that everything is working now! I f you have any further questions feel free to open another topic