I use Rpi4 4Gb and x825 board. It works without problem and supports UAS
Thank you.
And boots directly from SSD?
Yes without SD. Rpi4 4Gb HassOS 5.2 64bit
Add to config.txt
dtparam=sd_poll_once=on
This line makes disable the time-out messages for the SD card
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Thanks again 
As i read, you are talking about HassOS 5.2 64bit from ssd/usb
Any one do it with Home Assistant CORE? running with raspberry OS…?
thanks
great topic… great contibutions
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Thanks for the hint.
I added the following lines into /mnt/boot/config.txt:
# disable wlan0 as I use cable only
dtoverlay=disable-wifi
# poll sd cards only once during boot (without ‘=on’)
dtparam=sd_poll_once
Now I haven’t seen any “mmc0: sdhci:” messages anymore.
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Hello,
I’m using a Raspberry PI4 with 8gb with the image HassOS 5.2 image 64 bits installed on a NVME SSD. I have exactly the same problem than MediaStorm
“I have HassOS running from an SD card with no issues - if I try to boot via SSD with that same image, I get a quick screen with some info and then the screen immediately goes black and the system is hung up.”
I have added sd_poll_once=on to dtparam in config.txt but with no effect.
I have tried booting either from USB3 or USB2 with no effect.
I have an image from USB3 Raspberry OS 64 bits and it works with no problem so my SSD is actually not the problem.
Do you have any idea how to solve this ?
Regards.
Try this one
SLC-lite
Or more expensive
SLC sd card (industrial grade)
I have no experience as i installed it but i think it will hold much longer than any consumer cards will
@Ukro the problem concerns booting on a SSD connected to a USB port on Home Assistant 5.2, not a SD Card which works perfectly.
Am I right, that you downloaded the image “hassos_rpi4-64-5.2.img.gz” from the Home Assistant web site? Did you also write the image to the SSD using balenaEtcher (1.5.109)?
Mine is called hassos_rpi4-5.2.img.gz maybe this is the wrong one, i download the one with exact same name than yours and will try again … i’ll let you know !
Ok thanks Adrian for the help. Boot succeeded but only with a USB 2 port and not a USB 3. Any idea how to fix this ?
Sorry, Christian, I don’t know. Pi4 seems to have USB3.0 boot problems (see here) but I don’t know the root cause of this.
I’m using the “Seagate One Touch SSD (500GB)” on the USB3.0 without any issues.
Sorry, that I don’t have better information for you.
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Thanks a lot Adrian for your help. Regards.
@ Igors Micko boot on NVME SSD Samsung EVO 500gb on USB 2 port only with ICY BOX M2 adapter.
For me required to start ’ sudo raspi-config ’ and choose USB boot option.
After that Raspberry Pi 4 4G + HP SSD S700 Pro + Icy Box - boot on USB 3 w/out SD card.
SSD populated with HassOS Dev 5.2 64-bit version.
Thank You very much.
i see 
I’m happy for you that you got it working. I’m still having problems with the USB3. The boot on USB 2 seems fine but on 3 the system won’t boot. Raspberry Pi 4 4G + WD BLUE SN550 + Icy Box.
Why only USB 2? Can’t seem to find any workaround or reason in the chats. (But they are lengthy so might have missed it)
thank you very much for pointing me in the right direction
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