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by jbowler
Tue Oct 30, 2018 1:15 am
Forum: General discussion
Topic: Raspberry pi as SIP Server
Replies: 2
Views: 3830

Re: Raspberry pi as SIP Server

So far my own experiences of using RaspBX on a 3B have been favorable. Most of the problems come down to Asterisk itself which has an over complex configuration which allows everything to be set everywhere. That said, I'm now looking for something which, perhaps, should have existed before running t...
by jbowler
Wed Aug 05, 2015 1:41 am
Forum: General discussion
Topic: Curved Screens ?
Replies: 4
Views: 1146

Re: Curved Screens ?

BMS Doug wrote:I'd suggest a PiWall you will need X+1 Raspberry Pi's (where X == number of screens).
Neat. I hadn't seen a display made up of non-identical tiles before, but then I'm not keeping up with this stuff.

John Bowler
by jbowler
Wed Aug 05, 2015 1:12 am
Forum: General discussion
Topic: Will Apple iPad charger work for power supply?
Replies: 4
Views: 5509

Re: Will Apple iPad charger work for power supply?

I'm planning on purchasing a Raspberry Pi 2 model B and I don't want to have to purchase additional equipment, Yep, the extra stuff costs more than the p2b. I have a micro USB to USB cable and an iPad charger. I just want to make sure it will work reliably with the Pi as the power supply. It will. ...
by jbowler
Sun Apr 19, 2015 2:05 am
Forum: C/C++
Topic: using NEON gcc flags on pi 2
Replies: 11
Views: 9355

Re: using NEON gcc flags on pi 2

Hi, I am trying to compile some code on my pi and I would like to use the gcc flags to enable NEON optimisations. However, when I try to compile with the appropriate flags, gcc informs me that cortex-a7 is a bad value for the -mcpu flag. Neither -march nor -mcpu affect the floating point. You have ...
by jbowler
Tue Mar 31, 2015 1:32 am
Forum: Linux Kernel
Topic: /proc/cpuinfo reports arch 7 ?
Replies: 6
Views: 7147

Re: /proc/cpuinfo reports arch 7 ?

On a B+ (I've removed the uninteresting lines): pelicone ~ # cat /proc/cpuinfo model name : ARMv6-compatible processor rev 7 (v6l) Features : half thumb fastmult vfp edsp java tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xb76 CPU revision : 7 Hardware : BCM2708 Revisi...
by jbowler
Mon Jan 19, 2015 2:58 am
Forum: Linux Kernel
Topic: Fast boot raspberry pi
Replies: 15
Views: 8970

Re: Fast boot raspberry pi

To be slightly more constructive: The original UNIX kernel required that everything you wanted to do with the hardware be there right at the start, and it has to be initialized right at the start too. The current Linux kernel does this as well, unless you use systemd, however the 'generic' kernel do...
by jbowler
Mon Jan 19, 2015 1:38 am
Forum: Linux Kernel
Topic: Fast boot raspberry pi
Replies: 15
Views: 8970

Re: Fast boot raspberry pi

The "fastest booting OS" is the one that spends the least time transferring data from the card into memory, running the least amount of code to "boot", and spending the least amount of time initializing sub-systems. its as simple as that. http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=74080...
by jbowler
Sun Jan 18, 2015 9:16 pm
Forum: Beginners
Topic: reset high-speed USB device number XXX using dwc_otg
Replies: 9
Views: 16887

Re: reset high-speed USB device number XXX using dwc_otg

The message seems to be harmless and to be the result of the device going into a suspend. The only issue I see is that the device in question is my root device and it seems that sometimes it doesn't come out of suspend resulting in my RPi having to be power-cycled (very very rarely, after a few week...
by jbowler
Sun Jan 18, 2015 6:30 am
Forum: Linux Kernel
Topic: Fast boot raspberry pi
Replies: 15
Views: 8970

Re: Fast boot raspberry pi

Running a systemd system I get to the point the kernel starts to run user mode processes in about 2.5 seconds, but I think that's misleading because the kernel is still running its bootstrap. On the same kernel (3.18.3) with OpenRC I get to the magic "Freeing unused kernel memory" at 5.5seconds. (Th...
by jbowler
Sat Jan 10, 2015 2:07 am
Forum: Gentoo
Topic: Boot stops at smsc95xx without error
Replies: 8
Views: 9712

Re: Boot stops at smsc95xx without error

That's not the problem: it worked, the Ethernet device registered just fine But it was already trying to run 'init' off the boot device, and nothing happened; so it found init (which would normally be the path /etc/init or /sbin/init maybe these days on the root / device), but nothing happened. (Loo...
by jbowler
Wed Dec 31, 2014 3:58 am
Forum: Gentoo
Topic: any gentoo users out there?
Replies: 5
Views: 3679

Re: any gentoo users out there?

I am running 3.12.32 kernel here and I have xfce4 as my windows manager. I tried to use distcc here but so far I am having no luck. Can you explain to me how to properly set it up on the pi and another pc? I also have gentoo installed on my laptop and a vb gentoo running on my Win 8.1 pc. Well, it ...
by jbowler
Sun Dec 07, 2014 7:46 pm
Forum: General programming discussion
Topic: Bin/bash question?
Replies: 8
Views: 1361

Re: Bin/bash question?

IRC "\n" just ends up as "n", however this works:

Code: Select all

string+='
'
And you can just do this:

Code: Select all

echo "1st line
2nd line" | mail
John Bowler
by jbowler
Sun Dec 07, 2014 7:37 pm
Forum: Gentoo
Topic: any gentoo users out there?
Replies: 5
Views: 3679

Re: any gentoo users out there?

I meant 3.12 and 3.17 in my previous post, not 3.6.12/3.6.17
by jbowler
Sun Dec 07, 2014 7:35 pm
Forum: General discussion
Topic: how to set date and time
Replies: 26
Views: 326034

Re: how to set date and time

In general if you are using NTP to set the RPi clock you must do it in two steps: 1) Set the clock approximately correct using another program, such as ntpclient; this reads the time from an NTP server (e.g. pool.ntp.org) and forces the system clock to that time. 2) Start ntpd to do the accurate syn...
by jbowler
Sun Dec 07, 2014 7:12 pm
Forum: Gentoo
Topic: any gentoo users out there?
Replies: 5
Views: 3679

Re: any gentoo users out there?

I have gentoo running on both a B (OpenRC, no graphics, running as my DNS service) and a B+ (systemd, gnome, just as a play/test system.) The 3.6.12 kernel did not work for the latter; there seems to be a bug in the OOM handling which means it never pages, it just kills. As a result building gnome i...
by jbowler
Mon Nov 24, 2014 6:48 am
Forum: General discussion
Topic: HDMI to VGA adapter
Replies: 14
Views: 2463

Re: Vga to HDMI adapter

I'm not so sure about Mahjongg's assertion with regard to the power problems. I have a B+, one of those old VGA monitors (well, I actually have more than one of course) and one of these: http://www.amazon.com/gp/product/B00JLRHMZE/ref=oh_aui_detailpage_o02_s02?ie=UTF8&psc=1 Well, again I lie; I actu...
by jbowler
Sun Nov 23, 2014 1:35 am
Forum: General discussion
Topic: Connecting External 2.5" HDD to Raspberry Pi
Replies: 10
Views: 16434

Re: Connecting External 2.5" HDD to Raspberry Pi

Here's another update on this. My B (not B+) has an old, flakey, Maxtor One Touch based ext4 root partition. This was preventing me moving from Linux kernel 3.12.25, because later versions detect the flakiness and go into a never-ending fsck/reboot loop. I solved this by re-purposing a Samsung 840 1...
by jbowler
Wed Nov 19, 2014 10:04 pm
Forum: Linux Kernel
Topic: 3.12.y vs 3.15.y
Replies: 10
Views: 4255

Re: 3.12.y vs 3.15.y

The current state is apparently in this issue on github: https://github.com/raspberrypi/linux/issues/720 For those who don't want to follow the link and read the whole discussion the summary (popcornmix, 13 days ago) is: "We're contemplating moving on from 3.12.y for default kernel. 3.14.y is one op...
by jbowler
Sun Sep 28, 2014 4:04 am
Forum: General discussion
Topic: Tarball extraction question
Replies: 11
Views: 1327

Re: Tarball extraction question

Jednorozec wrote:I use tar xvf all the time and it manages to figure out what compression scheme is being used.
You could try to be constructive in your responses:

tar czf - . | tar tf -

John Bowler
by jbowler
Sun Sep 28, 2014 2:07 am
Forum: General discussion
Topic: Tarball extraction question
Replies: 11
Views: 1327

Re: Tarball extraction question

Incidentally, you do not need to tell tar how or whether to uncompress—it has been able to work that out for many years: tar xvf QtSixA-1.5.1-src.tar.gz Not true and misleading advice. The GNU implementation that I use seems to require a searchable object to do what you say. In general if you know ...
by jbowler
Wed Sep 24, 2014 12:24 am
Forum: General discussion
Topic: Connecting External 2.5" HDD to Raspberry Pi
Replies: 10
Views: 16434

Re: Connecting External 2.5" HDD to Raspberry Pi

Hi, just an update. It works, powering the external hdd using other 5V 1A psu. My raspberry pi manage to detect the hdd without problem. One thing funny i observed is, i have to power up my raspberry pi and hdd at the same time for it to work. If i power the hdd first and then raspberry pi, it wont...
by jbowler
Sat Sep 20, 2014 11:16 pm
Forum: General discussion
Topic: Cursor hanging after commands ending with $
Replies: 18
Views: 1834

Re: Cursor hanging after commands ending with $

It is not a bug, but it is more a feature of historical serial text terminals than of Unix. The design of the UI is pretty clear; the shell outputs a prompt to show it is waiting for input and the terminal is set to echo characters so the user knows what she has typed. The default behavior of outpu...
by jbowler
Sat Sep 20, 2014 2:39 am
Forum: General discussion
Topic: Cursor hanging after commands ending with $
Replies: 18
Views: 1834

Re: Cursor hanging after commands ending with $

It's a bug, but it is present in every command line base interface I've used except one (Apollo Aegis); it's nothing to do with Linux. The problem is that the input line is not independent of the output produced by any of the commands ("applications") run from the CLI (Command Line Interface). Some ...
by jbowler
Thu Sep 18, 2014 3:16 am
Forum: General discussion
Topic: USB Power problems persist in B+?
Replies: 16
Views: 3994

Re: USB Power problems persist in B+?

I suspect that Boomer's "very good 2A power supply" isn't that very good at all. On the other hand it might be a problem I've had ever since I started working on ARM based computers; the keyboards always start producing random characters shortly after I spill beer into them. I found that rinsing the...
by jbowler
Mon Sep 15, 2014 10:25 pm
Forum: General discussion
Topic: Call for testers: new MMC driver
Replies: 19
Views: 5895

Re: Call for testers: new MMC driver

Possibly the other configs should be deleted if they don't work. That may happen in the future if it's reported they are not working and there isn't an obvious fix. They should be *documented* somewhere and untested configs should either be deleted or given a meaningful name like "bcmrpi_untested_....

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