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About chrisf

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  1. You could mount a different volume at the place those directories are. Might even work with a symlink
  2. chrisf

    Help on Buffer strength GPIO

    It's my understanding that Allwinner GPIO's have configurable output drive levels. They're configured with the Px_DRVx_REG registers. There are 4 levels, from Level 0 to Level 3. The default is Level 1. I don't know what current corresponds to each level, it used to be 10mA, 20mA, 30mA and 40mA with the A20's. Level 1 is 20mA, which as the default for the register, matches the data sheet maximum drive strength. Personally, I'd put my own buffer on a GPIO if it's driving more than a few mA.
  3. chrisf

    NanoPi NEO4

    The GPU's in these SoC's can usually do h264. Older ones can't do hardware acceleration for h265. It requires kernel driver support for the GPU that's built in. This usually gets done for Android kernels, so phones and tablets have good performance. No one is paying to have this done in the mainline Linux kernel, it's left up to volunteers. The Exynos 5422 in the XU4 has hardware for encoding and decoding h.264 video. The C2's soc, the Amlogic S905 has hardware for h264 and h265. Hardkernel advertises that too, so you'd probably have better luck getting it working. You might need to use their kernel to get something working "out the box".
  4. chrisf

    NanoPi NEO4

    A benefit of the x86 based ones would be hardware video decoding driver support. The XU4 does have h264 hardware decoding support. The problem is getting it working in Chrome for YouTube. Apparently it worked with the Flash plugin, but it requires effort to enable to HTML5 video.
  5. chrisf

    Ubiquiti Unifi Controller on XU4

    It's still on jessie. I've had no reason to change anything. Jessie is still a supported version. In terms of "go into production", it's an SBC in my garage...
  6. chrisf

    Cubietruck : battery issues

    The risk of fire for unprotected cells is tall of you over charge them. They catch on fire when there is an internal short circuit. Over charging is one way to break down the insulation inside.
  7. chrisf

    Daily (tech related) news diet

    You kind of have to trust your ISP, all your internet traffic goes through them, regardless of the router. If you don't use its built-in switch and simply connect the ISP router to another switch, it doesn't have the ability to see any local traffic, other than what the switch directs to it. Even if you do use its built in switch, not all routers have the capability to sniff other traffic. It depends on what chip they use for the switch.
  8. chrisf

    Cubietruck : battery issues

    If I were you I'd measure the battery with a multimeter. If it really is above 4.2v it is a fire risk. If the board has calibration issues, that's not so bad.
  9. chrisf

    Ubiquiti Unifi Controller on XU4

    I have unifi running on an hc1 and I dont recall any issues. When I get home I'll see if I have time to post how I did it. This is the apt source I used # cat 100-ubnt-unifi.list deb stable ubiquiti The only other sources I have is armbian Edit: my mongodb-server package is from debian # apt-cache showpkg mongodb-server Package: mongodb-server Versions: 1:2.4.10-5+deb8u1 (/var/lib/apt/lists/httpredir.debian.org_debian_dists_jessie_main_binary-armhf_Packages)
  10. chrisf

    Ubiquiti Unifi Controller on XU4

    XU4 is 32bit, not 64bit. You need armhf, not arm64
  11. You'd want drive spin-up sequencing for 2 or more 3.5" drives running from a 60W PSU. You'd want at least 30W per drive for spin-up. You'd need to do that for initial power up and when waking from sleep. 15 drives peaking at 420W: Those were 5,900rpm Seagate drives, with a startup rating of 2A.
  12. chrisf

    Binary Execution error

    Is there a file called spyserver in the directory you're running the thing in?
  13. chrisf

    zram vs swap

    Have you got a tool to check the latency to compare USB2 and USB3? Or CPU usage when doing the same workload? My understanding of the difference between USB2 and 3 is USB2 is polled, while USB3 is interrupt driven. Assuming you haven't done something wrong and your numbers are an accurate representation, maybe at the hardware level USB3 requires more resources, all the interrupts could be causing excessive context switching. Or the drivers aren't as optimised yet. would be interesting to compare between different hardware USB3 implementations.
  14. chrisf

    Problem with memory

    I wouldn't be surprised with those numbers. Kingston doesn't aim for the top of the market in terms of performance. Their goal is low price. The cards will be specifically designed for sequential read and write performance. As soon as there's anything random in the write pattern, the speed will plummet. Even large block sizes of several MB will have terribly slow write speeds.
  15. chrisf

    Another RK3399: Khadas Edge

    Looks like they want someone to pay their wages for a while via an Indigogo campaign