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4-pin fan control |
Posted by: hazelnusse - 02-20-2021, 05:12 PM - Forum: RockPro64 Hardware and Accessories
- Replies (4)
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I would like to use an ultra-quiet low-power 12V 4-pin PWM fan and am trying to figure out how to best interface with the PWM signal and RPM Speed signals wires of such a fan. The specific fan I'm looking to use is the Noctua NF-A8 PWM fan which has the following electrical interface:
Blue: PWM Signal (+5V)
Green: RPM Speed Signal (open collector output)
Yellow: +12V
Black: Ground
I would need to ensure (somehow) that the FAN+ is always at 12V, I'm not sure how this pin gets controlled in startup via u-boot / Linux but in my application I would want to ensure it goes high and stays high sometime during boot.
I'm looking for options on how to interface to the Blue and Green cables. I think my options are either somehow directly to some of the 5V pins on the Pi-2 header, or alternatively, perhaps some sort of separate fan control breakout.
One idea I had was to use the Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor breakout. This would use the i2c interface on the pi-2 header.
I would then need to interface that with a temperature diode somewhere -- ideally one that already exists on the RK3399, the board near the SoC, or I guess on the CPU heatsink. From what I can tell, one of the 3904 BJT type diodes mentioned in Table 4 would work.
Does anybody have any experience using a 4-pin fan on the RK3399 in a NAS application?
Details on the Noctua fan interface.
Details on the EMC2101.
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Presenting my Linux distribution and a help call |
Posted by: shyanjmc - 02-20-2021, 04:14 PM - Forum: Community and Events
- No Replies
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Hello everyone.
My name is ShyanJMC.
I'm working on a CLFS (Cross Linux From Scratch) in which I'm designing and developing a minimal OS.
I called it; BlackOS
Github page;
https://github.com/shyanjmc/blackos
Github Source Code;
https://github.com/ShyanJMC/LinuxFromScratch-Sources
BlackOS is a Linux system from scratch designed for ARMv8 System On a Chip (known as SOC).
It is designed to be minimal as possible, so you will find a very basic and minimal system. The reason for this is you can adapt your applications to your requirements.
Think about this system like a minimal OS for to rebuild the humanity if you are in an apocalypse or in a place without Internet connection and you have only a few SBCs without much power and need digital services. In the future I will provide you with the source code of some projects like Lighttpd, GCC, Clang and others, so you can quickly copy it inside BlackOS and compile them.
In the first steps of this proyect, I built BlackOS for Raspberry Pi and Pine Rock64 but considering that there are so many SBCs in the world(each one with specifics configurations to boot), I chose to make a Linux system without kernel. So, you will have to download the release, then compile the kernel for the ARCH target and finally you will have to integrate the firmware and the bootloader inside "/boot" and modules in "/lib/modules" folders to boot BlackOS, it is easier and makes BlackOS more portable.
Now the true; I love the Pine64's SBCs but is difficult to me get one of those (there are many problems in Argentina). Because of that I would like request your help; if you like this project (or the target of this) please help me testing BlackOS in others SBCs and inform me in Github if you have issues in another of Pine64's SBCs (I'm testing on my Pine Rock64). Also, always is good have choices for operative systems.
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Safe poweroff |
Posted by: guenther - 02-20-2021, 02:59 PM - Forum: DC Power In
- Replies (3)
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Hi folks!
I'm running OpenWrt on a A64+. "Poweroff" in terminal on the device results in a reboot. It's OpenWrt related. That means, whenever I want to power off, I simply pull the plug, which leads to dirty flag set on the SD card (ext4).
So here is my question:
Is there any difference between pull the plug..or..hold down the power button for several seconds until it cuts out? Will the dirty flag also be set with that procedure?
The power button is not yet installed and I would guess there is no routine implemented in OpenWrt to "poweroff" the device safely with just a tap on the button.
I know a router is intended to run 24/7, so it's not a big deal. I'm just interested if there is a difference in the procedures.
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broken connector-pin for the accu |
Posted by: alwi - 02-20-2021, 08:44 AM - Forum: PinePhone Hardware
- Replies (2)
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Hallo together,
after 3 weeks testing the phone with different OS - today happend a tiny damage with substantial effect.
The left of 4 contacts broke and the phone is sadly unusable.
When I look at the expanded mainboard I think it would be possible to replace the contact-group by soldering. But where to get such part? Or must I buy a new PCB?
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Managed Ethernet switch on the Clusterboard |
Posted by: dsimic - 02-20-2021, 07:53 AM - Forum: Clusterboard
- Replies (6)
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Hello,
The switch ASIC used on the Clusterboard is Realtek RTL8370N, which the wiki page declares as an unmanaged switch ASIC. However, this switch ASIC actually includes all of the necessary logic to work as a managed switch, with a pretty complete feature set. It also has a built-in Intel 8051, which can be used to implement a management interface.
As a confirmation, the RTL8370N ASIC is used in the D-Link DGS-1100-08, which is a managed Ethernet switch. This D-Link switch includes no other management-related components, only the RTL8370N ASIC.
I am willing to work on implementing the required management interface and other software support, which would turn the RTL8370N into a managed Ethernet switch. IMHO, that would be great, but it would require an SDK that can only be provided by Realtek.
@tllim, would you be able to provide the above-described SDK, please?
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Recent changes to the Pine64 wiki |
Posted by: dsimic - 02-20-2021, 07:18 AM - Forum: General
- Replies (4)
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Hello,
What actually happened recently to the Pine64 wiki? The watchlist and the list of changes (i.e. edits) to the pages have been changed in a way that makes them unusable, at least to me. For example, I can no longer compare revisions of pages, which is very important to me.
As far as I can tell, it's either some "user-friendly" variant of the interface, or it's the mobile version that became the only one available. Maybe some other users find the new interface to be user-friendly, but to me it's no longer usable.
Could we, please, get an option in the preferences to select the previous version of the interface?
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PinePhone Security |
Posted by: TurpentineOS - 02-20-2021, 06:34 AM - Forum: General Discussion on PinePhone
- Replies (9)
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I'm wondering if PinePhone has any of the following or is planned to have any of the following:
1) Titan M-like security chip
2) Hardware-backed keystore
3) Verified boot
4) Wifi and Cellular Baseband Isolation IOMMU
5) Device-specific software hardening (like kernel CFI)
Thanks - and feel free to discuss!
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Reinstall Geary ? |
Posted by: Gary2003 - 02-20-2021, 12:52 AM - Forum: Manjaro on PinePhone
- Replies (1)
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Hi,
At the begining Geary was not working good, so I uninstall and reinstall it with the software manager.
Now it work (Geary version 1:3.38.1-1), but it's not the responsive version ?
(Manjaro, Gnome version 3.38.3, I check for update everyday).
Best regards
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