USB host/device boot - various improvements #1126
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Page previously did not specify type of USB boot. Other Pi models do support USB *DEVICE* boot, so the previous sentence was incorrect.
…other pages And more accurate: some Pi 2Bs -> Pi 2B version 1.2
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I was leaving dealing with device boot to another PR. I also hadn't realised we had this inconsistency between how this page documents device versus host boot. It would therefore make sense to include fixing up the docs for device boot in this PR so this question of consistency can be addressed directly. Also, the issue of duplication applies equally to the device boot docs, so it makes sense to consider this question at the same time for both host and device boot. |
…i/README.md" This reverts commit 44ecfbf.
ghost
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@ghollingworth Is the list of which devices can do USB device mode correct? Also, there is an issue around precedence of the OTP bits for device and host boot mode - can you possibly explain that so I can document it? |
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The 3A+ shouldn't be on the "USB device mode" page as the OTG_ID pin is tied to ground. |
Thanks. I'm awaiting confirmation of the device list for USB device boot mode from the folks at Pi towers. |
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OK, so this is awaiting one more piece of information: confirmation of which Raspberry Pis can do USB device mode boot @JamesH65 @ghollingworth |
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I've no idea, but when you think you have completed a PR (not just this one) can you post asking me to push it to copy edit. Otherwise, I have no idea whether the work has been completed. |
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Will do - thanks |
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Is this ready to go to copy edit? |
Not quite - need confirmation from @ghollingworth that the list of devices that can use USB device mode boot is correct, namely:
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Basically anything that doesn't have a hub in the way!
…On Fri, 10 May 2019, 12:46 andrum99, ***@***.***> wrote:
Is this ready to go to copy edit?
Not quite - need confirmation from @ghollingworth
<https://github.com/ghollingworth> that the list of devices that can use
USB device mode boot is correct, namely:
- Compute Module
- Compute Module 3 and 3+
- Pi Zero, Zero W and WH
- Pi A and 3A+
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But not the 3A+ ( https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=227044#p1392654 ). |
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More recent versions of 3A+ will work... It's only the first few thousand units that had the USB host boot bit set |
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@ghollingworth Ahhh, so does that mean that "recent" 3A+ boards function like the 3B, in that they won't USB host-boot (i.e. boot off a USB flash drive) until the relevant OTP bit is explicitly set? (which presumably also then disables USB device-boot, like on "early" 3A+ boards?) |
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Thanks Gordon - this one is now ready to go to CE @JamesH65 |
That's good to know but it's a shame the post was just closed and no one bothered to update it with the current status. |
It would certainly have been useful if Gordon (@ghollingworth) had mentioned that nugget of information on the forum thread before he locked it. Don't know if it is possible to unlock it now and do that - paging @ghollingworth 😉 |
ghost
deleted the
The pages which describe the various USB host boot modes are inconsistent in what they say about which models of Pi can do which boot mode. Standardise all appropriate pages on the same wording (or very similar, given some describe a "sub-mode" of USB host boot i.e. MSD / net boot), and fix one instance of where the wording is slightly wrong.