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ASRock J5040-ITX Mini-ITX PCI-E M.2 boot

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Kernel32 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kernel32 Quote  Post ReplyReply Direct Link To This Post Topic: ASRock J5040-ITX Mini-ITX PCI-E M.2 boot
    Posted: 02 Aug 2022 at 10:02pm
Hi everyone,

I can't boot from M.2 SSD connected to PCI-E via an adapter. Does this motherboard support boot from PCI-E slot?
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Xaltar View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2022 at 11:40pm
I would send a support ticket to ASRock and ask:
https://event.asrock.com/tsd.asp

They will know for certain and what steps you need to follow if it is possible.
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threadzipper1957 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote threadzipper1957 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2022 at 5:06pm
The PCIE slot on the board has only one PCI Express 2.0 lane, for an M.2, you must have at least 4 lanes, so it will not work.
The M.2 key E slot, is meant for Wifi cards, it cannot handle an M.2
Kind Regards
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jcoelho Quote  Post ReplyReply Direct Link To This Post Posted: 5 minutes ago at 1:32am
that is not true. I am currently running and booting a 250GB NVME Samsung 980 SSD from the 1x PCIE slot via a cheap Amazon adapter. The PCIe specs allows for you to run devices on less than the optimum number of PCIe lanes. There is of course a trade off since running a PCIe 4x device on a 1X lanes you lose 75% of your bandwidth. But for me the loss in performance is worth freeing up a sata port.

Also I have confirmed that adding a card to the M.2 Wifi A/E keyed slot will work with one of those 2 port Sata adapters. I have not confirmed if it will boot from those ports but it is readable.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jcoelho Quote  Post ReplyReply Direct Link To This Post Posted: 3 minutes ago at 1:34am
I have been able to boot a Samsung NVME 250GB SSD from a 1x PCIe adapter which I purchased from amazon.   this is how I am currently booting my Truenas box
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