Hi just had a look and there doesn't appear to be an easy option, though
there are a few things that could help in u-boot by the looks of things,
I'm not too familiar with u-boot, and it would require probably require
someone who would know what they were doing to really help.
But I guess probably you'd need to compile u-boot, changing some stuff,
like grepping for "uA", "uV", "max-current" , "max-current" etc. have a
look at arch/arm/dts and see what's going in there etc. Probably there
is a main voltage regulator and a usb voltage regulator, someone who
knows about electronics could tell you if it could be a problem with
either, or just one or the other.
You could try typing "power info" from the prompt or something similar,
which may or may not show you usb current. Else, like you or someone
suggested, obtain a usb current and voltage meter and work out if that's
the issue for sure.
U-boot seems to be very board-specific which generally provides some
evidence against my original hypothesis, though it's difficult to tell.
Bare in mind, it could be a coincidence that both our arm devices are
struggling with USB and turn out not be power related at all, cheers,
Josh
On 31/03/19 21:24, Josh Branning wrote:
This is interesting, a while back I tried plugging in an external HDD to
an olinuxino (ARM) using parabola, and it didn't get enough power
either. At that point, I assumed it was because the board wasn't
providing the right power through the USB. I was using a power pack that
matched the recommended input voltage and current of the board.
Possibly a different thing entirely, but you never know ... there could
be some setting in the kernel or bootloader or something that means the
devices are only getting limited power through the USBs.
Another way to test if it is a parabola issue, could be to burn a live
CD or make a usb of a different distro, and see if the adapter works
with that, though if it is solely a bootloader issue, I guess that
wouldn't be much help less a alternate one is also supplied. It is
something I didn't do, because I assumed it would have probably been the
hardware simply being not able to supply required the power.
Note that on some other less-free similar dev boards, USB hdds worked,
albeit with a different distro. I know fosho that on some of these
boards there is a bootloader setting where you can adjust the output
current/voltage, so there may be one in u-boot too.
Cheers,
Josh
On 31/03/19 20:43, Lee Strobel wrote:
lsusb for the Senao EUB9801 says its max power is 450mA, so only 50mA
less than the Atheros. However, I suspect those are just numbers
someone's typed in a text file somewhere. They might not actually be
drawing those currents.
It looks like a USB tester can be purchased online for $10. For that
money, I might just buy one and actually measure the current draw.
Btw, from what I saw on Wikipedia, it looks like a standard usb 2.0
port should be able to supply 500mA as standard.
Lee
On Sun, 2019-03-31 at 14:04 -0400, Lee Strobel wrote:
Hi Denis,
For the record, the WiFi related bugreport is here:
https://labs.parabola.nu/issues/2261
Could you try to see if a USB HUB that is powered by its own power
supply makes it usable. If you don't have one you may know people
that
have one and borrow it just for doing a quick test.
I will see what I can do. I can't think of anyone I know off-hand who
would have an externally-powered USB hub, but I will ask around.
About the power thing: I actually have an older USB wifi dongle, a
'Senao EUB9801', which seems to work great when plugged directly into
the Chromebook (if I use the firmware blob). According to the kernel
boot log, I think it is running on a Ralink chip of some kind. I will
try to investigate, as you suggested, and see if it requires less
power
than the ThinkPenguin dongle. It is older (~8-10 years), so maybe it
is
using an older wifi technology that consumes less power?
The reason I asked about the kernel devs is just because I was
wondering if the team that maintains the module for the Atheros chip
are aware of the issue. I would think we might need their assistance,
if any of us wanted to try to modify the module.
Lee
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