On Fri, Jun 8, 2018 at 10:06 AM, Peter Robinson <pbrobinson(a)gmail.com> wrote:
>>>> I have two questions about BeagleBone Black.
>>>> 1. Is there anyway to make it boot when plug into power adapter? By this
>>>> I mean, without the matter of push the power button.
>>>> 2. I see by console=ttyO0 cannot get the log printed onto serial now.
>>>> Although I know console=tty0 can still make the logs printed to a
>>>> screen, but showing on the serial is always easier for debug. So is
>>>> there anywhere I can check the new console name?
>> The console was moved to ttyS0, but should still show output on ttyO0. I
>> still use ttyO0 and get a warning during the boot:
>> [ 0.004075] WARNING: Your 'console=ttyO0' has been replaced by
>> I do use an RS232 cape for my serial console, so perhaps it differs. Can
>> anyone else confirm?
> Hi Paul,
> Thanks for your info.
> Well, I tried "console=ttyO0" and it do not work yesterday. While just
> now I switched to "console=ttyO0,115200n8" and it works all of a sudden,
> not sure why. So at last my working kernel commandline looks like
> ro root=UUID=0dc43cd3-b7f5-47dc-8b74-5261d2dd7ded console=ttyO0,115200n8
You need to specify speed for the serial port, you can now with F-28+
also use ttyS0, the ttyO0 is an alias for compatibility.
Thanks for the info.
> By the way, I am using a cheap PL2303 serial, lsusb shows the following.
> Bus 002 Device 007: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
> By the way, I don't know what hack takes effect, but today my BBB can
> boot without push the button XD
I suspect it was powering on but the serial console negotiation was
causing random data on the console during u-boot which interrupted the
boot process. I've never had to press the power button on any of my
beaglebones to make it start.
Oh well, I never think about this. Especially from the first day I
have my BBB, I need to push the power button to make it start. But
luckily I do not need to push it now.
Just FYI, I tested 4.17.0-1.fc29.armv7hl on BBB (as well as my other
arm devices, but it is a different topic) and decided to close the
ancient bug we filed before since I don't think we can install any
popular desktop now.
Ziqian SUN (Zamir)
GPG : 1D86 6D4A 49CE 4BBD 72CF FCF5 D856 6E11 F2A0 525E
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