update qemu setup
old one was wheezy based, every thing outdated stretch has ruby2.3 out of the box
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Torsten Ruger
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@ -11,8 +11,15 @@
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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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%p
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We'll more or less follow a
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=ext_link "blog post", "https://blog.agchapman.com/using-qemu-to-emulate-a-raspberry-pi/"
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i found, with small additions.
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%h3 Qemu
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%p 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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%p
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Get the Qemu. There may be other emulators out there, and i have read of armulator,
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but this is what i found described 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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@ -20,47 +27,52 @@
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%h3 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
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There seems to be some chicken and egg problem, so qemu needs the kernel separately.
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There is one in the links.
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%h3 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.
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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),
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so boot your Pi and then configure:
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%p
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Create a directory for the stuff on your mac, ie pi.
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%pre
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%code
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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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mkdir pi
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pi is in the gitignore, and the scripts in bin, will assume pi.
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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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Get the latest Raspian image. The
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=ext_link "lite version" "https://www.raspberrypi.org/downloads/raspbian/"
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without Gui is fine, and smaller.
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%p
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Change the file format with something like:
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%pre
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%code
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qemu-img convert -f raw -O qcow2 2017-08-16-raspbian-stretch-lite.img raspbian-stretch-lite.qcow
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So we can then resize the file, without it taking extra space
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%pre
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%code
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qemu-img resize raspbian-stretch-lite.qcow +6G
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Put the resulting file into the pi directory.
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%h3 Kernel
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%p
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One still needs a kernel (even there is one on the image?), and Druv kindly keeps a
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repository of them. Since we downloaded the stretch image, grap the
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=ext_link "stretch kernel" , "https://github.com/dhruvvyas90/qemu-rpi-kernel/raw/master/kernel-qemu-4.9.59-stretch"
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and also the mysterious
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=ext_link "tdb file." , "https://github.com/dhruvvyas90/qemu-rpi-kernel/raw/master/versatile-pb.dtb"
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Both go into the pi directory.
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%h3 Boot
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%p
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There is quite a bit to the command line to boot the pi. There is a script in the bin
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directory, but 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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qemu-system-arm -kernel pi/kernel-qemu-4.9.59-stretch -dtb pi/versatile-pb.dtb -cpu arm1176 -m 256 -M versatilepb -no-reboot -serial stdio -append 'root=/dev/sda2 panic=1 rootfstype=ext4 rw' -hda pi/raspbian-stretch-lite.qcow -net nic -net user,hostfwd=tcp::2222-:22
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%ul
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%li the cpu is what broadcom specifies, ok
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%li memory is unfortunately 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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%li the "-net user,hostfwd=tcp::2222-:22" 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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@ -68,41 +80,24 @@
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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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%h3 Working on the pi
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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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You'll probably want to log in by ssh at some point. If for no other reason than
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Ctl-C will stop the emulator when you are logged in, and not the program you are
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running on the emulator. This gets old _really_ quickly.
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%p
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To configure the ssh server on the pi, log in and run
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%pre
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%code
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sudo raspi-config
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and enable ssh in the interface options.
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There is another text on how to
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=link_to "work on" , "/arm/remote_pi.html"
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the pi. Off course google is good , and raspian site can help too.
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%h2#links Links
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%p
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Blog post (i used):
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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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More Recent post (i googled):
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=ext_link "https://blog.agchapman.com/using-qemu-to-emulate-a-raspberry-pi/", "https://blog.agchapman.com/using-qemu-to-emulate-a-raspberry-pi/"
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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 by torrent):
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=ext_link "http://www.raspberrypi.org/downloads/", "http://www.raspberrypi.org/downloads/"
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%ul#selector
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%li=ext_link "Post used for instructions", "https://blog.agchapman.com/using-qemu-to-emulate-a-raspberry-pi/"
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%li=ext_link "stretch kernel" , "https://github.com/dhruvvyas90/qemu-rpi-kernel/raw/master/kernel-qemu-4.9.59-stretch"
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%li=ext_link "Rasbian image file", "http://www.raspberrypi.org/downloads/"
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