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pcengines / apu2-documentation

Documentation and scripts for building and adjusting PC Engines APU2 firmware
https://pcengines.github.io/apu2-documentation/
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apu2d4 cannot be powered off when Huawei ME909s-120 is installed #156

Open jbzld2 opened 5 years ago

jbzld2 commented 5 years ago

With an apu2d4 board setup with Debian Buster (10.0), Linux 4.19.0-5-amd64 and firmware v4.9.0.6 , the board cannot be powered off with a command such as shutdown -h now when a Huawei ME909s-120 LTE modem is installed. When the system is shut down, the leftmost LED switches off but then the 3 LEDs blink back on after approximately 10 secs.

When I remove the modem from mPCIe 2 , that same shutdown command works as it should.

It is expected that this APU will be a backup router and will be powered on by WoL only when needed.

Any idea on what is going on?

krystian-hebel commented 5 years ago

I believe @miczyg1 noticed something similar

miczyg1 commented 5 years ago

@jbzld2 have a look at https://pcengines.ch/schema/apu2c.pdf page 8 J13 (mPCIe2 connector). There is a PE_WAKE signal (active low) which is connected to pin 1 to the module. If the module grounds this pin, the PE_WAKE will boot the platform up again after poweroff. The same mechanism is used on wakeonlan. The NIC emits low signal on PE_WAKE which results in platform bring up. If YOu have any means to check the pin 1 state, verify please it is 3.3V there (high). This is the most probable scenario I am thinking of now.

charles-martel55 commented 2 years ago

Hello,

I have the same issue with a Quectel EP06. I tested the pin, the module ground it all the time.

Is it possible to add an option to disable this pin in BIOS ?

metux commented 1 year ago

Hello,

I have the same issue with a Quectel EP06. I tested the pin, the module ground it all the time.

Is it possible to add an option to disable this pin in BIOS ?

If somebody really understand the deep black magic of the pinmux, there might be some chance (if this pin can be configured by the pinmux and one finds out the right control bit).

When writing the linux apu board driver, I kept myself away from that, since I couldn't find any reliable information on that specific SoC.