Go to advanced search

by jahboater
Sat Apr 02, 2016 4:55 pm
Forum: Other projects
Topic: Fully metal heatpipe case?
Replies: 12
Views: 6342

Re: Fully metal heatpipe case?

I liked this one
https://www.adafruit.com/products/1039
Discontinued, but looks like they are making a Pi3 version.
by jahboater
Sat Apr 02, 2016 12:20 pm
Forum: General discussion
Topic: Pi3 Unboxing and recommended heatsinks
Replies: 4
Views: 915

Re: Pi3 Unboxing and recommended heatsinks

I use these now. They are twice as tall and a little more chunky than the PiHut ones I used to use.
25C/W (the PiHut hut ones are 27C/W). Expensive at £4 though.
http://www.modmypi.com/raspberry-pi/acc ... -kit-black
by jahboater
Fri Apr 01, 2016 6:10 pm
Forum: Beginners
Topic: Raspberry Pi 2: FFT computing capabilities
Replies: 20
Views: 4116

Re: Raspberry Pi 2: FFT computing capabilities

Isn’t NEON on Pi3 quad issue compared to single issue on the Pi2?

Perhaps that would compare well to a low end Intel machine.
by jahboater
Wed Mar 30, 2016 5:39 pm
Forum: Advanced users
Topic: Assembler svc's
Replies: 4
Views: 829

Re: Assembler svc's

Try putting the call number in r7 (SYS_chmod say 15?), and the arguments in registers r0, r1, r2 etc in the same order as the C call. The mode is probably just an integer. For chmod, with only two arguments, just set r0 and r1. r0 gets overwritten by the return value. If not zero, its probably -errno.
by jahboater
Tue Mar 29, 2016 6:38 pm
Forum: General discussion
Topic: PSU or Wifi problems ? Check your USB cables
Replies: 4
Views: 826

Re: PSU or Wifi problems ? Check your USB cables

you can also use a multimeter to check the resistance on the power leads, well if you have a adapter to get the micro USB accessible enough, i have resorted to making my own cables from time to time, monoprice (the have both ebay and amazon accounts in addition to there own site) sells some good qu...
by jahboater
Tue Mar 29, 2016 9:28 am
Forum: General discussion
Topic: C++ internal compile error
Replies: 4
Views: 3827

Re: C++ internal compile error

To create a 1GB swapfile. You will need to re-do the swapon if you reboot the Pi.

Code: Select all

sudo dd if=/dev/zero of=/swapfile1GB bs=1M count=1024
sudo mkswap /swapfile1GB
sudo swapon /swapfile1GB
by jahboater
Tue Mar 29, 2016 8:20 am
Forum: General discussion
Topic: WIFI WEP key not accepted
Replies: 12
Views: 11199

Re: WIFI WEP key not accepted

Can you post the contents of your wpa supplicant file (minus the passwords)? All of the issues I've had with it have come down to simple typos, or quotation marks in places where it won't accept them. Also, the IP you said you got, looks a lot like the ones it has assigned when it can't get an IP. ...
by jahboater
Mon Mar 28, 2016 7:29 pm
Forum: Other projects
Topic: Random Thing Picker
Replies: 3
Views: 1009

Re: Random Thing Picker

Just for interest ... The Pi has a hardware (true) random number generator. This appears as /dev/hwrng which needs root permission. I believe it feeds /dev/random and /dev/urandom which are available to all. Its probably mixed in with other sources of entropy. To get a good random number, open "/dev...
by jahboater
Mon Mar 28, 2016 6:40 pm
Forum: Beginners
Topic: pi 3 ..ssh.
Replies: 14
Views: 16370

Re: pi 3 ..ssh.

Sorry about that. When in doubt...
When in doubt... run as a normal user!
by jahboater
Sat Mar 26, 2016 12:52 pm
Forum: General discussion
Topic: How reliable is the Raspberry Pi 3
Replies: 19
Views: 11932

Re: How reliable is the Raspberry Pi 3

I think the SoC has an expected lifetime of around 40 years, maybe 35 or so if overclocked.
The SD card will be a lot less of course, but you can help by making it read-only.
by jahboater
Sat Mar 26, 2016 8:37 am
Forum: Troubleshooting
Topic: 3TB Drive USB several formats
Replies: 6
Views: 8658

Re: 3TB Drive USB several formats

Code: Select all

mkfs.ext4
see "man mkfs.ext4" for details. You don't need to install anything, ext4 is the "standard" Linux filesystem.
by jahboater
Sat Mar 26, 2016 8:01 am
Forum: C/C++
Topic: gcc5 repository
Replies: 10
Views: 5802

Re: gcc5 repository

I'm not entirely sure why it states that it's depreciated unless it's still trying to consider A32 mode instead of T32. You did specify to compile in Thumb as default and maybe interwork with ARM where it makes sense? In ARM mode, it doesn't use if-then statements as far as I understand. It's also ...
by jahboater
Fri Mar 25, 2016 8:29 pm
Forum: C/C++
Topic: gcc5 repository
Replies: 10
Views: 5802

Re: gcc5 repository

Does that command work when cross compiling on a 64-bit desktop of Ubuntu with the arm binaries installed? If not, how would you set the cross compiler to avoid all of the memory constraints and decrease compile time? I'm looking at using --thumb-interwork, graphite, gold, and lto to eventually com...
by jahboater
Thu Mar 24, 2016 9:27 pm
Forum: General discussion
Topic: pi 3 wifi range
Replies: 34
Views: 68108

Re: pi 3 wifi range

If your WiFi signal is vertically polarised (which many are) then it may help if you position the Pi3 vertically rather than flat. It definitely helped mine.
by jahboater
Thu Mar 24, 2016 9:29 am
Forum: Raspberry Pi OS
Topic: OS fragility?
Replies: 4
Views: 897

Re: OS fragility?

Did you expand the filesystem before installing anything?

sudo raspi-config works from the command line, option 1.

Raspbian is definitely not fragile.
by jahboater
Thu Mar 24, 2016 9:19 am
Forum: Assistive technology and accessibility
Topic: Assisted Interface for Handicapped Users
Replies: 3
Views: 9692

Re: Assisted Interface for Handicapped Users

Another example of how the Pi is helping people way beyond the RPF's education mission.

Best wishes
by jahboater
Thu Mar 24, 2016 9:07 am
Forum: Advanced users
Topic: ext2+nilfs2 on sd-card
Replies: 7
Views: 3093

Re: ext2+nilfs2 on sd-card

I assume you are using the same SSD for all the experiments, otherwise the results are meaningless. Ext4 has delayed allocation/extents so most files will be contiguous and there should be less fragmentation. Filefrag -v <myfile> tells all. You can put these filesystems in virtual memory with: tmpfs...
by jahboater
Thu Mar 24, 2016 7:44 am
Forum: Beginners
Topic: Disable wifi activity LED
Replies: 8
Views: 1428

Re: Disable wifi activity LED

Black tape?
by jahboater
Wed Mar 23, 2016 5:44 pm
Forum: Troubleshooting
Topic: [Resolved] Lots of inodes available, inexplicably low sto...
Replies: 17
Views: 2354

Re: Lots of inodes available, inexplicably low storage left.

I like ncdu!
It is already included with Raspbian by the way, even in Lite.
by jahboater
Wed Mar 23, 2016 5:39 pm
Forum: Troubleshooting
Topic: [Resolved] Lots of inodes available, inexplicably low sto...
Replies: 17
Views: 2354

Re: Lots of inodes available, inexplicably low storage left.

Is this SeaFile thing putting deleted files in a "trash" bin or somewhere they can be recovered from in case of a mistake?
by jahboater
Wed Mar 23, 2016 2:15 pm
Forum: Troubleshooting
Topic: [Resolved] Lots of inodes available, inexplicably low sto...
Replies: 17
Views: 2354

Re: Lots of inodes available, inexplicably low storage left.

As you know, there are two versions of Raspbian. The "full" one and the Lite one. The full one is over 4GB when unzipped. I don't know if you were expecting that? You might be able to find the disk hog with:- du -s * | sort -rn and follow the tree down. Or re-image raspbian, do the expand, and then ...
by jahboater
Wed Mar 23, 2016 1:57 pm
Forum: Troubleshooting
Topic: [Resolved] Lots of inodes available, inexplicably low sto...
Replies: 17
Views: 2354

Re: Lots of inodes available, inexplicably low storage left.

I wonder if you have a fake SD card? These claim to be larger than they really are.
by jahboater
Wed Mar 23, 2016 1:31 pm
Forum: Troubleshooting
Topic: [Resolved] Lots of inodes available, inexplicably low sto...
Replies: 17
Views: 2354

Re: Lots of inodes available, inexplicably low storage left.

I expanded the filesystem before-hand on my 8GB micro SD card (this setup was essentially a proof-of-concept, the card was formatted before installation). Did you use NOOBS or install the Raspbian image directly? If you simply installed Raspbian, then your formatting was pointless - the image (.img...
by jahboater
Wed Mar 23, 2016 8:45 am
Forum: Beginners
Topic: Acces denied when copying files
Replies: 8
Views: 1344

Re: Acces denied when copying files

Type "mount" and if your disk is mounted you should see it in the list. If it says"ro" instead of "rw" (readonly instead of readwrite) then perhaps a problem was detected and to be safe its disabled write. Also do "ls -ld <directory>" to see the file system permissions and ownership in the tree. The...

Go to advanced search