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<Net147>
Strange issue with Olimex A20 Micro Rev J. U-Boot enables LDO3 to 2.8V. Kernel turns LDO3 off as it isn't used. On reboot U-Boot enables LDO3 to 2.8V again. However the sequence "LDO3 off, LDO3 on" cause the PMIC to power off the board for some reason... so restart results in shutdown instead
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<KotCzarny>
i think there was similar issue raised by oliv3r long time ago
<KotCzarny>
about toggling some ldo resulting in board power off
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<KotCzarny>
probably because some failsafe triggering
<Net147>
Workaround would be to specify the regulator as always on in the DT, but was there any better way to handle it?
<KotCzarny>
don't remember if they came up with a fix, hum, it might be something about voltage rising too high on turn on and triggering failsafe
<KotCzarny>
might be totally different issue, but just saying
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<Net147>
Haven't checked on older board revision yet. Rev J is relatively new and Ethernet doesn't work with stock mainline U-Boot and kernel.
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<Net147>
KotCzarny: I was also able to make the board power off just toggling the LDO3 enable bit off and then on from U-Boot prompt using i2c
<KotCzarny>
then yeah, same issue, they worked it around by making voltage rise slower
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<ceng>
For the A64 (and I guess in general) are there hard incompatabilities with having mainline u-boot (2017.05-rc3?) hand off to an older kernel (like 3.10.105+)?
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<beeble>
ceng: atf has to match
<KotCzarny>
humm
<KotCzarny>
match what?
<KotCzarny>
also, that could be the reason i wasnt able to boot 3.10 with mainline uboot
<KotCzarny>
ie. driviers missing their settings
<beeble>
you need a atf that works without arisc for mainline uboot with 3.10 kernel
<KotCzarny>
beeble: for me it was segfaulting during drivers init in kernel
<KotCzarny>
first at sunxi-ir-rx, next in something else missing regulator setting
<beeble>
KotCzarny: i can tell you that with apritzels atf you will not be able to boot 3.10. and that state is "works as intended"
<KotCzarny>
hum
<KotCzarny>
what should i use then?
<beeble>
not sure, ask the pine guys? :)
<KotCzarny>
and he should include that bit of important info in the readme ;)
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<KotCzarny>
Alx14: nope
<KotCzarny>
erm. wrong chan
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