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-Running gPXE within qemu
-========================
-
-Michael Brown <mbrown@fensystems.co.uk>
-
-To get qemu running is fairly simple:
-
-1. Build the utilities in this directory:
- make
-
-2. Get the qemu source code:
- svn co svn://svn.savannah.nongnu.org/qemu/trunk qemu
-
-2a. Patch the qemu code. There is currently a bug that causes qemu to
- execute gPXE incredibly slowly. The bug seems to be related
- to the relative prioritisation of CPU and I/O operations within
- qemu. This patch (which I found via Google) isn't a proper fix,
- but it does work around the problem:
- patch -p0 < qemu-patch
-
-3. Configure qemu with
- pushd qemu
- ./configure --target-list=i386-softmmu,x86_64-softmmu
- popd
-
-4. Build qemu:
- make -C qemu
-
-5. As root, set up a TAP virtual network device:
- /sbin/modprobe tun
- chmod o+rw /dev/net/tun
- ./tunctl -u <username> -t tap0
- /sbin/ifconfig tap0 up 10.254.254.2 netmask 255.255.255.0
-
-6. As root, add the following fragment to /etc/dhcpd.conf:
- subnet 10.254.254.0 netmask 255.255.255.252 {
- range dynamic-bootp 10.254.254.1 10.254.254.1;
- }
- You will also need to add in any of your usual declarations for
- gPXE, e.g. 'filename "vmlinuz.ltsp";'. Note that this setup
- assumes that your DHCP server, TFTP server etc. all live on the
- machine you are using for running qemu. If not, then you're on
- your own.
-
-7. As root, restart dhcpd
- /etc/init.d/dhcpd restart
-
-8. Build gPXE floppy disk images and pad to 1.44MB
- pushd ../../src
- make bin/rtl8139.dsk
- popd
-
-9. Start qemu
- ./qemu/i386-softmmu/qemu -L qemu/pc-bios \
- -net nic,model=rtl8139 -net tap,ifname=tap0 \
- -boot a -fda ../../src/bin/rtl8139.dsk
-
-You should see qemu start up, load up gPXE and attempt to boot from
-the network.
-
-
-
-Serial console
-==============
-
-You can use the program "serial-console" to obtain a virtual serial
-console for gPXE running within qemu. Run "./serial-console" on a
-spare tty (e.g. a separate xterm window) before starting qemu, and
-ensure that you have enabled CONSOLE_SERIAL in config.h.
-
-When serial-console starts, it will print out the message "Slave pty
-is /dev/pts/XX", where XX is a number. You need to append the option
-
- -serial /dev/pts/XX
-
-to the qemu command line.
-
-There is a manual page for "serial-console"; use "man
-./serial-console.1" to view it.