Difference between revisions of "Talk:Quartz64 Model A Using a battery"
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I can't find the temperature measured by the PTC resistor of my Renata battery. Is the reading of the temperature value available somewhere? If so, could this please also be documented here? | I can't find the temperature measured by the PTC resistor of my Renata battery. Is the reading of the temperature value available somewhere? If so, could this please also be documented here? | ||
Answer: this has not yet (as of kernel version 6.11.2) been implemented. | |||
Also: the maximum charging current seems to be ignored, I find the following (Armbian 6.6.52 kernel): | |||
<pre> | |||
root@nas:~# od --endian=big -td4 < /sys/firmware/devicetree/base/battery/constant-charge-current-max-microamp | |||
0000000 1400000 | |||
0000004 | |||
</pre> | |||
However: | |||
<pre> | |||
root@nas:~# cat /sys/class/power_supply/rk817-battery/constant_charge_current_max | |||
1000000 | |||
</pre> | |||
Answer: this is a hardware limitation, I have updated the Wiki-page accordingly. | |||
More serious: I am trying to resurrect the PCI-Express bus after switching to battery and then reconnecting the 12V power supply. This does not seem to work. From reading various sources something like | |||
<pre> | |||
echo 1 > /sys/bus/pci/rescan | |||
</pre> | |||
But this does not hack it. Without disconnecting the 12V supply it is possible to soft-disconnect the PCIe bus and then recover like so: | |||
<pre> | |||
root@nas:~# echo 1 > /sys/bus/pci/devices/0000:00:00.0/remove | |||
sleep 5 # or whatever periode | |||
echo 1 > /sys/bus/pci/rescan | |||
</pre> | |||
Afterwards the PCIe SATA controller card is back again and operational. | |||
However, the rescan command does not recover the SATA controller after switching to battery-powered mode and then switching back to 12V main power supply. | |||
Latest revision as of 00:33, 7 October 2024
I can't find the temperature measured by the PTC resistor of my Renata battery. Is the reading of the temperature value available somewhere? If so, could this please also be documented here?
Answer: this has not yet (as of kernel version 6.11.2) been implemented.
Also: the maximum charging current seems to be ignored, I find the following (Armbian 6.6.52 kernel):
root@nas:~# od --endian=big -td4 < /sys/firmware/devicetree/base/battery/constant-charge-current-max-microamp 0000000 1400000 0000004
However:
root@nas:~# cat /sys/class/power_supply/rk817-battery/constant_charge_current_max 1000000
Answer: this is a hardware limitation, I have updated the Wiki-page accordingly.
More serious: I am trying to resurrect the PCI-Express bus after switching to battery and then reconnecting the 12V power supply. This does not seem to work. From reading various sources something like
echo 1 > /sys/bus/pci/rescan
But this does not hack it. Without disconnecting the 12V supply it is possible to soft-disconnect the PCIe bus and then recover like so:
root@nas:~# echo 1 > /sys/bus/pci/devices/0000:00:00.0/remove sleep 5 # or whatever periode echo 1 > /sys/bus/pci/rescan
Afterwards the PCIe SATA controller card is back again and operational.
However, the rescan command does not recover the SATA controller after switching to battery-powered mode and then switching back to 12V main power supply.