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<fALSO>
good morning
<DuClare>
mooin
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<asimko>
hello everyone, i have a problem with rebooting my sunxi board (olimex a20 micro), and I think it is a problem with u-boot. After I send a reboot command on the end i get: U-Boot SPL 2019.04-01848-g4488e3031b (May 07 2019 - 10:30:03 +0200) DR and then nothing, board is shutdown instead, can somebody please help me? the problem is only with the mainline kernel and latest u-boot, with sunxi kernel and old u-boot i can reboot proper
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<mru>
what about new kernel with old u-boot?
<mru>
or old kernel with new u-boot?
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<megi>
asimko: can you reboot the board from u-boot via reset command?
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<asimko>
megi: yes, i tried that now ... so that is not a problem of uboot right?
<asimko>
but where should i look now, what is causing this issue?
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<asimko>
i have one weird think when booting: EHCI failed to shut down host controller ... could be this that issue that i canno reboot?
<megi>
asimko: Does the kernel print "Rebooting..."
<megi>
?
<asimko>
megi: yes these are last lines: [ 134.743012] reboot: Restarting system U-Boot SPL 2019.04-01848-g4488e3031b (May 07 2019 - 10:30:03 +0200) DR
<mru>
could be power related
<megi>
old kernel works though
<mru>
maybe the new kernel turns off some regulator that u-boot expects to be on
<asimko>
legacy kernel works (mine is 3.4.104)
<mru>
and there's enough capacitance to take it that far
<asimko>
mru: but if it is a power related problem, what should i check in kernel?
<megi>
you can try ktrace on the regulator framework
<mru>
measure the power supplies
<mru>
cold boot into u-boot and measure there
<mru>
then reboot from the new kernel and see if anything is different
<megi>
eh, ftrace ;)
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<asimko>
mru: really? there is no problem with the same board and older kernel and older u-boot, it has to be something related to the new kernel, but i need the newer kernel and that canoot boot with older u-boot, and i already tried different version of u-boot but still the same, and there is a one line from u-boot after kernel prints restarting so i tought is has something with that
<mru>
the new kernel obviously puts the hardware in a state that u-boot isn't expecting
<asimko>
mru: that sounds right, but how to inspect it and find the solution :) ...