Tiny Core Base > Raspberry Pi

No HDMI output when booting from USB drive on rPi W2

(1/5) > >>

atomant:
Hello good people of TCL community!

My setup: Raspberry Pi Zero W2 running piCore 15.0.0 (downloaded it today from the official download link)

Here's the deal: I have the same exact system burned onto a MicroSD card and also onto an SSD drive. I set up the rPi to be able to boot from USB (program_usb_boot_mode=1 into config.txt and then booted from SD card).
When booting from SD card I get video output on the HDMI port, albeit a bit unstable as it flashes/disappears/blinks randomly but constantly for short times but I suppose that could be remedied by playing around with the corresponding "fields" in config.txt like config_hdmi_boost, hdmi_safe, etc...
My problem is that if i boot from the USB SSD drive I get no video output at all, screen stays blank. I'm quite sure it actually boots based on the rPi's and USB drive's LEDs and If i connect a keyboard and blindly type in "sudo poweroff now" it turns off (LEDs turn off) suggesting that it managed to boot to a prompt and was accepting input.
What I tried so far and observed no change in behavior:
-using a powered USB hub to connect the drive
-connecting the drive directly (so no USB hub)
-trying 3 different HDMI cables
-trying another HDMI/mini HDMI adapter
-trying 3 different power sources (all should have been more than enough to supply enough power)
-trying 3 different monitors
-trying to play around with the HDMI related settings in config.txt (safe mode, no safe mode, overscan, no overscan, trying hdmi_group and hdmi_mode, hdmi_force_hotplug...)
-trying "dtoverlay=vc4-kms-v3d" and "dtoverlay=vc4-fmsf-v3d" (i changed these everywhere I found them in the file)
-adding boot_delay=5 (was suggested somewhere online to give more time for hardware components to get up to speed or whatnot)

I have no idea what else to try, I don't get why there's video with SD card but no video with USB drive.
Any suggestions, ideas?

atomant:
Correction, "dtoverlay=vc4-fkms-v3d" not "dtoverlay=vc4-fmsf-v3d" above...

Rich:
Hi atomant
Maybe you need to add something like:

--- Code: ---waitusb=5
--- End code ---
to your cmdline.txt file?

Paul_123:
There should be nothing needed for a HDMI signal showing the console.   Plain HDMI cable/monitor works for me.


If you want graphics (i.e. vc4 overlays)  Then you need to load the graphics kernel modules  (graphics-KERNEL.tcz)

mocore:

--- Quote from: atomant on February 12, 2025, 12:18:22 PM ---Hello good people of TCL community!

My setup: Raspberry Pi Zero W2
...
When booting from SD card I get video output on the HDMI port, albeit a bit unstable as it flashes/disappears/blinks randomly but constantly for short times but I suppose that could be remedied by playing around with the corresponding "fields" in config.txt like config_hdmi_boost, hdmi_safe, etc...


--- End quote ---

what spec PSU?

things to try

- power supply with *more* amps !!

- different usb (could be faulty?)

- "official" raspberry OS image (sd & usb) , if you sill have
   "randomly - unstable : flashes/disappears/blinks " hdmi
   ... it will no doubt be of interest to hw manufactures / might be firmware/hw fault?
   ( if more amps/PSU/ ect fails to resolve issues )

*imho!

Navigation

[0] Message Index

[#] Next page