adds the emulator and ssh howto pages
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Torsten Ruger
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@ -47,6 +47,9 @@
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<li class="link3">
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<a href="/about.html">About</a>
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</li>
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<li class="link3">
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<a href="/contribute.html">Contribute</a>
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</li>
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<li class="link4">
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<a href="{{site.posts.first.url}}">News</a>
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</li>
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66
qemu.md
66
qemu.md
@ -3,8 +3,8 @@ layout: site
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title: How to configure Qemu
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---
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Target Pi on Mac
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----------------
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##Target Pi on Mac
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So even the idea is to run software on the Pi, not everyone has a Pi (yet :-)
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@ -12,28 +12,28 @@ Others, like me, prefer to develop on a laptop and not carry the Pi around.
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For all those, this here explains how to emulate the Pi on a Mac.
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Replace the buggy llvm
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-----------------------
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Even if you have a Pi, [this explains](/remote_pi.html) a nice way to develop with it.
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###Replace the buggy llvm
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Written April 2014: as of writing the latest and greatest llvm based gcc (5.1) on Maverick (10.9) has a bug that makes qemu hang.
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So type gcc -v and if the output contains "LLVM version 5.1", you must install gcc4.2. Easily donw with homebrew:
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brew install https://raw.github.com/Homebrew/homebrew-dupes/master/apple-gcc42.rb
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brew install https://raw.github.com/Homebrew/homebrew-dupes/master/apple-gcc42.rb
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This will not interfere with the systems compiler as the gcc4.3 has postfixed executables (ie gcc-4.2)
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Qemu
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----
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###Qemu
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Then its time to get the Qemu. There may be other emulators out there, and i have read of armulator, but this is what i found discribed and it works and is "easy enough".
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brew install qemu --env=std --cc=gcc-4.2
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brew install qemu --env=std --cc=gcc-4.2
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For people not on Maverick it may work without the -cc option.
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Pi images
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----------
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###Pi images
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Create a directory for the stuff on your mac, ie pi.
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@ -41,32 +41,31 @@ Get the latest Raspian image.
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There seems to be some chicken and egg problem, so quemu needs the kernel seperately. There is one in the links.
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Configure
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---------
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###Configure
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In the blog post there is some fun configuration, I did it and it works. Not sure what happens if you don't.
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The booting is described below (you may or may not need an extra init=/bin/bash in the root... quotes), so boot your Pi and then configure:
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nano /etc/ld.so.preload
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nano /etc/ld.so.preload
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Put a # in front of the first to comment it out. Should just be one line there.
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Press ctrl-x then y then enter to save and exit.
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(Optional) Create a file /etc/udev/rules.d/90-qemu.rules with the following content:
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KERNEL=="sda", SYMLINK+="mmcblk0"
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KERNEL=="sda?", SYMLINK+="mmcblk0p%n"
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KERNEL=="sda2", SYMLINK+="root"
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KERNEL=="sda", SYMLINK+="mmcblk0"
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KERNEL=="sda?", SYMLINK+="mmcblk0p%n"
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KERNEL=="sda2", SYMLINK+="root"
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The kernel sees the disk as /dev/sda, while a real pi sees /dev/mmcblk0.
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This will create symlinks to be more consistent with the real pi.
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Boot
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-----
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###Boot
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There is quite a bit to the command line to boot the pi (i have an alias), here it is:
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qemu-system-arm -kernel kernel-qemu -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append 'root=/dev/sda2 panic=1 rootfstype=ext4 rw' -hda raspbian.img -redir tcp:2222::22
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qemu-system-arm -kernel kernel-qemu -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append 'root=/dev/sda2 panic=1 rootfstype=ext4 rw' -hda raspbian.img -redir tcp:2222::22
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- the cpu is what braodcom precifies, ok
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- memory is unfortuantely hardcoded in the versatilepb "machine"
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@ -74,20 +73,27 @@ qemu-system-arm -kernel kernel-qemu -cpu arm1176 -m 256 -M versatilepb -no-reboo
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- raspbian.img is the image you downloaded. Renamed as it probably had the datestamp on it
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- the redir redircts the port 2222 to let you log into the pi
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So "ssh -p 2222 -l pi localhost" will get you "in". Ie username pi (password raspberry is the default) and port 2222
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So
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ssh -p 2222 -l pi localhost
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will get you "in". Ie username pi (password raspberry is the default) and port 2222
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Qemu bridges the network (that it emulates), and so your pi is now as connected as your mac.
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More Disk
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---------
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###More Disk
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The image that you download has only 200Mb free. Since the gcc is included and we're developing (tiny little files of) ruby, this may be ok. If not there is a 3 step procedure to up the space.
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1. dd if=/dev/zero bs=1m count=2048 >> raspbian.img
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dd if=/dev/zero bs=1m count=2048 >> raspbian.img
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The 2048 gets you 2Gb as we specified 1m (meg).
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2. On the pi launch "sudo fdisk /dev/sda" . This will probably only work if your do the (Optional) config above.
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On the pi launch
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sudo fdisk /dev/sda
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This will probably only work if your do the (Optional) config above.
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Say p, and write down the start of the second partition (122880 for me).
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d 2 will delete the second partition
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@ -96,11 +102,15 @@ write the number as start and just return to the end.
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p to check
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w to write and quit.
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3. Reboot, and run resize2fs
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Reboot, and run
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resize2fs
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Links
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-----
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Blog post: http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/
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Kernel: http://xecdesign.com/downloads/linux-qemu/kernel-qemu
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Rasbian file system(preferably be torrent): http://www.raspberrypi.org/downloads/
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Blog post: [http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/](http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/)
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Kernel: [http://xecdesign.com/downloads/linux-qemu/kernel-qemu](http://xecdesign.com/downloads/linux-qemu/kernel-qemu)
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Rasbian file system(preferably be torrent): [http://www.raspberrypi.org/downloads/](http://www.raspberrypi.org/downloads/)
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24
remote_pi.md
24
remote_pi.md
@ -3,8 +3,7 @@ layout: site
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title: How to use a remote pi
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---
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Headless
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--------
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###Headless
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The pi is a strange mix, development board and full pc in one. Some people use it as a pc, but not me.
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@ -12,23 +11,21 @@ I use the pi because it is the same price as an Arduino, but much more powerful.
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As such i don't use the keyboard or display and that is called headless mode, logging in with ssh.
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ssh -p 2222 -l pi localhost
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ssh -p 2222 -l pi localhost
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the -p 2222 is only needed for the qemu version, not the real pi.
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the -p 2222 is only needed for the qemu version, not the real pi.
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Authorized
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-----------
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###Authorized
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Over ssh one can use many other tools, but the password soon gets to be a pain.
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So the first thing i do is copy my public key over to the pi. This will allow login without password.
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scp -P 2222 .ssh/id_rsa.pub pi@localhost:.ssh/authorized_keys
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scp -P 2222 .ssh/id_rsa.pub pi@localhost:.ssh/authorized_keys
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This assumes a fresh pi, otherwise you have to append your key to the authorized ones. Also if it complains about no
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id_rsa.pub then you have to generate a key pair (public/private) using ssh-keygen (no password, otherwise you'll be typing that)
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Syncing
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-------
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###Syncing
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Off course I do all that to be able to actually work on my machine. On the Pi my keyboard doesn't even work and
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i'd have to use emacs or nano instead of TextMate. So i need to get the files accross.
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@ -36,12 +33,11 @@ For this there is a million ways, but since i just go one way (mac to pi) i use
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I set up a directory (home) in my pi directory (on the mac), that i copy to the home directory on the pi using:
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rsync -r -a -v -e "ssh -l pi -p 2222" ~/pi/home/ localhost:/home/pi
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rsync -r -a -v -e "ssh -l pi -p 2222" ~/pi/home/ localhost:/home/pi
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The pi/home is on my laptop and the command transfers all files to /home/pi , the default directory of the pi user.
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Automatic sync
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--------------
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###Automatic sync
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Transferring files is off course nice, but having to do it by hand after saving quickly becomes tedious.
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@ -50,7 +46,9 @@ Fswatch to the rescue. It will watch the filesystem (fs) for changes. Install wi
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Then you can store the above rsync command in a shell script, say sync.sh.
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Add afplay "/System/Library/Sounds/Morse.aiff" if you like to know it worked.
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Then just run fswatch ~/pi/home/ sync.sh
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Then just run
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fswatch ~/pi/home/ sync.sh
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And hear the ping each time you save.
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