103 lines
4.5 KiB
Plaintext
103 lines
4.5 KiB
Plaintext
= render "pages/arm/menu"
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%h1= title "How to configure Qemu"
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%h2#target-pi-on-mac Target Pi on Mac
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%p So even the idea is to run software on the Pi, not everyone has a Pi (yet :-)
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%p Others, like me, prefer to develop on a laptop and not carry the Pi around.
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%p For all those, this here explains how to emulate the Pi on a Mac.
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%p
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Even if you have a Pi,
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=link_to "this explains", "remote_pi.html"
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a nice way to develop with it.
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%h3#replace-the-buggy-llvm Replace the buggy llvm
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%p 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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%p So type gcc -v and if the output contains “LLVM version 5.1”, you must install gcc4.2. Easily done with homebrew:
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%pre
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%code
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:preserve
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brew install https://raw.github.com/Homebrew/homebrew-dupes/master/apple-gcc42.rb
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%p This will not interfere with the systems compiler as the gcc4.2 has postfixed executables (ie gcc-4.2)
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%h3#qemu Qemu
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%p 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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%pre
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%code
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:preserve
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brew install qemu --env=std --cc=gcc-4.2
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%p For people not on Maverick it may work without the -cc option.
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%h3#pi-images Pi images
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%p Create a directory for the stuff on your mac, ie pi.
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%p Get the latest Raspian image.
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%p 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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%h3#configure Configure
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%p
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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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%p nano /etc/ld.so.preload
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%p Put a # in front of the first to comment it out. Should just be one line there.
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%p Press ctrl-x then y then enter to save and exit.
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%p (Optional) Create a file /etc/udev/rules.d/90-qemu.rules with the following content:
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%pre
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%code
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:preserve
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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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%p
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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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%h3#boot Boot
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%p There is quite a bit to the command line to boot the pi (i have an alias), here it is:
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%pre
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%code
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:preserve
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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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%ul
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%li the cpu is what braodcom precifies, ok
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%li memory is unfortuantely hardcoded in the versatilepb “machine”
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%li the kernel is the file name of the kernel you downloaded (or extracted)
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%li raspbian.img is the image you downloaded. Renamed as it probably had the datestamp on it
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%li the redir redircts the port 2222 to let you log into the pi
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%p So
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%pre
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%code
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:preserve
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ssh -p 2222 -l pi localhost
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%p will get you “in”. Ie username pi (password raspberry is the default) and port 2222
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%p Qemu bridges the network (that it emulates), and so your pi is now as connected as your mac.
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%h3#more-disk More Disk
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%p 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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%pre
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%code
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:preserve
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dd if=/dev/zero bs=1m count=2048 >> raspbian.img
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%p The 2048 gets you 2Gb as we specified 1m (meg).
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%p On the pi launch
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%pre
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%code
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:preserve
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sudo fdisk /dev/sda
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%p This will probably only work if your do the (Optional) config above.
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%p
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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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n p 2 will create a new primary second partition
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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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%p Reboot, and run
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%pre
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%code
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:preserve
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resize2fs
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%h2#links Links
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%p
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Blog post:
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=ext_link "http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/", "http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/"
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%p
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Kernel:
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=ext_link "http://xecdesign.com/downloads/linux-qemu/kernel-qemu", "http://xecdesign.com/downloads/linux-qemu/kernel-qemu"
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%p
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Rasbian file system(preferably be torrent):
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=ext_link "http://www.raspberrypi.org/downloads/", "http://www.raspberrypi.org/downloads/"
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