%p This will not interfere with the systems compiler as the gcc4.2 has postfixed executables (ie gcc-4.2)
%h3#qemu Qemu
%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”.
%pre
%code
:preserve
brew install qemu --env=std --cc=gcc-4.2
%p For people not on Maverick it may work without the -cc option.
%h3#pi-images Pi images
%p Create a directory for the stuff on your mac, ie pi.
%p Get the latest Raspian image.
%p There seems to be some chicken and egg problem, so quemu needs the kernel seperately. There is one in the links.
%h3#configure Configure
%p
In the blog post there is some fun configuration, I did it and it works. Not sure what happens if you don’t.
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:
%p nano /etc/ld.so.preload
%p Put a # in front of the first to comment it out. Should just be one line there.
%p Press ctrl-x then y then enter to save and exit.
%p (Optional) Create a file /etc/udev/rules.d/90-qemu.rules with the following content:
%pre
%code
:preserve
KERNEL=="sda", SYMLINK+="mmcblk0"
KERNEL=="sda?", SYMLINK+="mmcblk0p%n"
KERNEL=="sda2", SYMLINK+="root"
%p
The kernel sees the disk as /dev/sda, while a real pi sees /dev/mmcblk0.
This will create symlinks to be more consistent with the real pi.
%h3#boot Boot
%p There is quite a bit to the command line to boot the pi (i have an alias), here it is:
%li memory is unfortuantely hardcoded in the versatilepb “machine”
%li the kernel is the file name of the kernel you downloaded (or extracted)
%li raspbian.img is the image you downloaded. Renamed as it probably had the datestamp on it
%li the redir redircts the port 2222 to let you log into the pi
%p So
%pre
%code
:preserve
ssh -p 2222 -l pi localhost
%p will get you “in”. Ie username pi (password raspberry is the default) and port 2222
%p Qemu bridges the network (that it emulates), and so your pi is now as connected as your mac.
%h3#more-disk More Disk
%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.
%pre
%code
:preserve
dd if=/dev/zero bs=1m count=2048 >> raspbian.img
%p The 2048 gets you 2Gb as we specified 1m (meg).
%p On the pi launch
%pre
%code
:preserve
sudo fdisk /dev/sda
%p This will probably only work if your do the (Optional) config above.
%p
Say p, and write down the start of the second partition (122880 for me).
d 2 will delete the second partition
n p 2 will create a new primary second partition
write the number as start and just return to the end.
