Dennis Lee Bieber <[email protected]> wrote: > On Sat, 12 May 2018 13:46:57 +0100, Chris Green > <[email protected]> declaimed the following: > > >I have an old BBB with a 2Gb eMMC (A5A) and inadvertently plugged a
(actually an A6A, misread the label) > >microSD with a 4Gb IOT version of Debian on it. What should happen? > > > If the contents of the eMMC are really old, it likely doesn't even > look > at the SD card unless you hold down the alternate boot button. > > If the contents are rather modern, it may run uBoot from the eMMC and > then transition to the SD card (and that could fail if the eMMC uBoot > expects late [kernel] loading of device tree overlays, but the SD card > expects early [uBoot] device tree loading). > They're both modern as I'd already (after some hassle due the above things you've noted) getting a Debian 9.4 console installed into the eMMC. I was only trying to check whether the IOT image was good, I didn't actually want it on the BBB. It's just a spare BBB, not being used for anything at the moment. > >I *think* it's simply running from the microSD card which seems quite > >sensible. Is there an easy way of telling what memory it's running > >from? > > > Well, given the memory sizes, a quick test would just be to do "df" > from a console connection, and seeing what the largest partition comes up > as. Or try "uname -a" on the assumption that the SD card has a much newer > OS. > Yes, that's sort of how I concluded that it must be running from the microSD but I wondered if there was a more definite way. > Or, maybe... closely observe the blinkenlights... One identifies mmc0 > activity, and another mmc1 activity (now -- which is considered 0 and 1 is > an exercise for the user; I have a vague memory that at one point in the > past, 0 and 1 depended upon which device was used for booting, and was not > fixed to eMMC vs SD). > Yes, I don't think the mmc0/mmc1 thing helps much, they seem not to relate spcifically to eMMC and microSD - which is a pity. Thanks for all the ideas. -- Chris Green ยท -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/p0alse-cg5.ln1%40esprimo.zbmc.eu. For more options, visit https://groups.google.com/d/optout.
