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by summers
Mon Feb 09, 2015 12:46 pm
Forum: General discussion
Topic: Is there a roadmap or wishlist to Raspberry Pi vNEXT?
Replies: 17
Views: 2318

Re: Is there a roadmap or wishlist to Raspberry Pi vNEXT?

My guess is that the Raspberry "2 Pi r" will be just like the Pi 2, just with the U16 flash bug cured :)
by summers
Thu Feb 05, 2015 9:59 pm
Forum: Linux Kernel
Topic: Fast boot raspberry pi
Replies: 15
Views: 9500

Re: Fast boot raspberry pi

Within linux. Look at a custom kernel + a busybox initramfs. The ram disk you-ll need to build yourself. Suggest busy box + uclibc + whatever else you need. Then with the kernel - only enable the minimal that you need to boot the machine. Link the initramfs into the kernel. This will boot *very fast...
by summers
Wed Feb 04, 2015 8:42 pm
Forum: General discussion
Topic: pi 2 what software changes to get fsf approval?
Replies: 25
Views: 3657

Re: pi 2 what software changes to get fsf approval?

just occured to me - as broadcom seems to have made the BMC2836 specifically for the RPi2, could they have not made it to boot the arms first? then the blob would not have been needed, and it would have been a more standard system. Only reason not to do this would be to make the RPi2 as much like th...
by summers
Tue Jul 22, 2014 10:28 am
Forum: HATs and other add-ons
Topic: Preliminary B+ HAT (Hardware Attached on Top) docs/specs
Replies: 106
Views: 37326

Re: Preliminary B+ HATs docs/specs are here

This is sounding very like the beaglebone and beaglebone black set up with capes. How things are evolving with the beaglebone is maybe instructive, especially as capes have been part of the landscape for so long. Now in the past, the beagle bone has used a cape manager, that has handled bringing up ...
by summers
Fri Apr 18, 2014 9:13 am
Forum: Linux Kernel
Topic: initrd/initramfs problems
Replies: 3
Views: 7999

Re: initrd/initramfs problems

What I've always done on my pandaboard is to create the filesystem I want to live in. convert to cpio archive. gzipped the result. Then during kernel compile when configuring initramfs there is an option to give the file that contains the cpio archive. The build kernel then has the filesystem direct...
by summers
Sun Nov 03, 2013 9:14 am
Forum: Arch
Topic: How to SSH to raspberry pi without having a router as a brid
Replies: 13
Views: 21648

Re: How to SSH to raspberry pi without having a router as a

I've a BeagleBone Black doing just that. Seemed easy enough to do. 1) First off check that your pi has an IP address thats in the range expected by the router (/sbin/ifconfig is your friend) - if it isn't you can use ifconfig to reset the IP address. If using dhcp the address should be fine (on my B...
by summers
Sun Feb 03, 2013 1:51 pm
Forum: General discussion
Topic: Is possible to build rocket ship to MARS using raspberry Pi?
Replies: 33
Views: 5893

Re: Is possible to build rocket ship to MARS using raspberry

There are I guess a number of issues. 1) mechanical issues are so-so; one the one hand the RPi is a small pcb, that if bolted down should cope well with vibrations etc. The down side is how to bolt it down - it doesn't have good mounting options. Probably for space it would be mounted in slots down ...
by summers
Fri Feb 01, 2013 11:02 am
Forum: Linux Kernel
Topic: Busybox Ethernet Configuration
Replies: 2
Views: 7706

Re: Busybox Ethernet Configuration

Come across things like that in the past. Living in the busybox work the king of thing you need to do is develop a test for is the ethernet up yet, if yes - then bring it up, if not then sleep and try again. Kind of way to do this - when the eternet module gets loaded it will create some pseduo file...
by summers
Mon Dec 17, 2012 3:45 pm
Forum: Linux Kernel
Topic: RFS building
Replies: 3
Views: 1543

Re: RFS building

When I get time, i'll be building up a very minimal OS from scratch. e.g. linux with busybox in a ramdisk. But hasn't happened yet - indeed haven't yet gout round to setting up an operational toolchain ... From what I've seen, doesn't seem worth using uboot - as much as anything the binary blob that...
by summers
Tue Dec 11, 2012 3:56 pm
Forum: General discussion
Topic: Nexus 7 as monitor for Pi
Replies: 17
Views: 24017

Re: Nexus 7 as monitor for Pi

W. H. Heydt wrote:Depends on what kind of monitoring you want to do. A tablet should be able to support an ssh session or an X windows session.
Android doesn't run X does it?

In which case you wouldn't be able to do an X window session or ssh -X.

Not that I've tried this ...
by summers
Fri Dec 07, 2012 10:06 am
Forum: General discussion
Topic: Control brushless motor speeds
Replies: 18
Views: 8402

Re: Control brushless motor speeds

Well guess you would start by asking how many pole and home many phase is the motor. Pole tell you how many times you have to switch the current to get the motor to rotate once. Phases is how many signals you have to drive. Odds are you'll get a 2 phase motor, with some smallish number of poles. Jus...
by summers
Mon Nov 12, 2012 11:13 am
Forum: General discussion
Topic: Is there a way to prevent the SD card from getting corrupt?
Replies: 12
Views: 2659

Re: Is there a way to prevent the SD card from getting corru

Mount all directories off the SD as read only.

Any directory that needs write access, create as a ram disk.

You won't be able to save anything, and will run out of memory at some stage, but should be far more immune to having the power pulled.
by summers
Thu Nov 08, 2012 5:39 pm
Forum: General discussion
Topic: MFLOP questions
Replies: 8
Views: 5642

Re: MFLOP questions

You could always just check the http://en.wikipedia.org/wiki/BogoMips reported by the kernel ...

Code: Select all

dmesg | grep BogoMIPS
by summers
Mon Nov 05, 2012 10:43 am
Forum: General discussion
Topic: RPi in Car: "live" image (read-only)?
Replies: 26
Views: 7242

Re: RPi in Car: "live" image (read-only)?

Guess it depends what you want the pi to do. If its relatively little, and not X etc, then I'd suggest living in a ramdisk - with mounting and writing to the SD to be only occasional. Assuming you need more than that. Then arrange any RW filesystem to be a ram disk, and have the SD with the main OS ...
by summers
Fri Oct 26, 2012 10:44 am
Forum: General discussion
Topic: Xilinx FPGA expansion anyone?
Replies: 21
Views: 9985

Re: Xilinx FPGA expansion anyone?

Sounds like the concept is well aligned to the RPi aims, viz a low cost platform, that encorages users to get their hands dirty with hardware. In this case whats bing offered is experience in playing with FPGAs, so yes having it so it can be programmed from the Pi is a great idea. Would one be able ...
by summers
Fri Oct 26, 2012 10:24 am
Forum: General discussion
Topic: Fast booting pi?
Replies: 10
Views: 6362

Re: Fast booting pi?

Look at the kernel initramfs - if you build an inital file system up on that, and link in in with the kernel, you get *very* quick boot times on linux. On my pandaboard that goes this route, the initramfs has started applications even before the kernel has managed to bring up the interface through t...
by summers
Wed Oct 17, 2012 7:52 pm
Forum: General discussion
Topic: Current Farnell Delivery Time
Replies: 62
Views: 10032

Re: Current Farnell Delivery Time

summers wrote:Ordered 9/10/12 form Farnel UK, shipped 16/10/12. Expecting it to land on the doormat today or tomorrow.
And arrived today with a nice little message:

"We have a little surprise for you ... Inside the box is a new Raspberyy Pi with 512MB RAM waiting for you!"

:)
by summers
Wed Oct 17, 2012 8:34 am
Forum: General discussion
Topic: Farnell: ordering multiple items with a RasPi
Replies: 13
Views: 2187

Re: Farnell: ordering multiple items with a RasPi

Worked for me - I ordered a couple of freesacle freedom boards at the same time ...
by summers
Wed Oct 17, 2012 8:31 am
Forum: General discussion
Topic: Current Farnell Delivery Time
Replies: 62
Views: 10032

Re: Current Farnell Delivery Time

Ordered 9/10/12 form Farnel UK, shipped 16/10/12. Expecting it to land on the doormat today or tomorrow.
by summers
Mon Oct 15, 2012 9:28 pm
Forum: Linux Kernel
Topic: Linux 3.7
Replies: 3
Views: 2270

Re: Linux 3.7

Thanks for making a start. For me its great - like using open source stuff - and my RPi will start out as a uart booted OS, very simple. Would be nice to see framebuffer OS, wish I could offer help, but time doesn't allow, and probably you would need me to sign up to NDA. But great you can let bits ...
by summers
Mon Oct 15, 2012 9:06 pm
Forum: Linux Kernel
Topic: Linux 3.7
Replies: 3
Views: 2270

Linux 3.7

Havn't seem another post here, But sound like on the line for linux 3.7 is raspbery pi bits. Great lets make Rasbery pi open source. I wonder, is this all the bits of raspery pi changes to the kernel, or just some. Know that changes to the kernel take a bit to get into the main line - so would be go...
by summers
Thu Sep 13, 2012 9:23 pm
Forum: General discussion
Topic: Latest Order and Shipping update from RS & Allied
Replies: 209
Views: 45625

Re: Latest Order and Shipping update from RS & Allied

Sigh, well I've had enough of RS. Preregistered - and that went missing. Registered again, and that had months waiting list. Order gets delayed, rev 2 comes out - I ask if delayed order will be a rev 2, and you can't reply. Hence cancelled order. Issue is that RS response to RasPi orders is terrible...
by summers
Mon Sep 10, 2012 11:11 am
Forum: Linux Kernel
Topic: [Request] kexec based bootloader/grub replacement
Replies: 14
Views: 7846

Re: [Request] kexec based bootloader/grub replacement

Guess if pushing the idea hard you could go for a minimal kernel, e.g. no need to bring up USB and ethernet etc ... You do need USB for the keyboard at least and probably network also as well as ssh for headless usage. Good point. Pity though as its the external hardware that seems the slow stuff t...
by summers
Mon Sep 10, 2012 8:21 am
Forum: Linux Kernel
Topic: [Request] kexec based bootloader/grub replacement
Replies: 14
Views: 7846

Re: [Request] kexec based bootloader/grub replacement

Ah awesome. Didn't realise that he had it going. In that case, what you can do is use the bootc kernel, and make a small initramfs consisting of a shell of some sort, kexec, and a menu script that executes kexec with the kernel parameters required. I had a base install of Raspbian down to under 100...
by summers
Sat Sep 08, 2012 2:12 pm
Forum: Linux Kernel
Topic: [Request] kexec based bootloader/grub replacement
Replies: 14
Views: 7846

Re: [Request] kexec based bootloader/grub replacement

IIRC standard linux bootloaders like LILO and GRUB are x86 based, don't know I've heard of them working on arm machines. Most people using arms, seem to go towards uboot. Now I just use uboot to boot directly into linux, so I'm not sure if it has a menu mode to it. Anyway uboot does have a command l...

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