So, I’ve got VIM3L boards. New, sealed. None of them work right out of the box, just flashing K logo on the screen and reboot. I tried writing images downloaded from your web site. All images are marked VIM3L…EMMC… Just one passes the validation stage (Ubuntu 4.9 V 1.0.9). All other give me “Parse burn image fail” error. Even the kresque one. The image that I mention that passes through can be burned to EMMC but does not boot. Any help would be appreciated.
Replying to myself. While the issue with IMG files not loading into the burning software is not resolved, I found a solution to VIM3L not booting issue. I tried to use several different USB-C power supplies and couldn’t make any of my VIM3Ls work. Power supplies with up to 96W output - still no luck. But then I tried some cheap one and it worked. So, basically what I see is none of Apple power supplies can be used. Either VIM designers don’t like Apple or there are differences in protocols for requesting the required current from smart power supplies.
I cut the cable and connect to a lab power supply and monitor the current.
So many of the supplies are made for charging batteries and have a very “noisey” output. Another issue is the regulators do not respond quickly. The ARM boards are so fast the power supply cannot keep up with the demand. The power supply must be stiff and noise free.
I doubt it. Raspbery PI 4 works just fine from all the PSU I mentioned. But this is not the point anymore since it works from a simpler (and noisier) power supply. Btw, I am an electronic engineer for the last 40 years. I had a lot of fun reading about “fast ARM boards”.
It will, Pi4 is a horse and buggy compared to the VIM3. At least the VIM3 you can run a SSD from the USB port, try doing that on PI4 (without a powered hub). Most certainly better power management on the VIM 3 regarding that.
Either way all of the devices require a stiff supply with low noise to function properly. Also, what I found from cutting USB cable connectors off is some of them are using the small data wire for power. Now that really changes the power model dramatically. Unless the cable clearly states the max amp capacity I would be cautious in using them.
My RPI 4 work (and boot from) an external SSD connected through USB port. I even have a tutorial on how to do this. But I am just starting with VIMs. Got a lot of them (VIM1, VIM3L). Planning on getting more. PS. Thank you for this discussion. Nice talking to a smart person.
Not really smart, just old, these young people on here are way better at coding than me. Thank you very much for the compliment.
Just an FYI we must be of the same vintage, one of my first classes in college was FORTRAN on a VAX, had to go to the “printer room” to get my hard copy from a line printer. Things sure have changed quickly.