Add network support to Pi2/3

Also include changes needed for Qemu 5.1 from #20 as needed for
USB support.

Device comes up as usb0 but close enough to get started

Dockerfile

@@ -1,6 +1,6 @@
 # Build stage for qemu-system-arm
 FROM debian:stable-slim AS qemu-builder
-ARG QEMU_VERSION=4.2.0
+ARG QEMU_VERSION=5.1.0
 ENV QEMU_TARBALL="qemu-${QEMU_VERSION}.tar.xz"
 WORKDIR /qemu
 
@@ -67,6 +67,7 @@ ARG RPI_KERNEL_CHECKSUM="295a22f1cd49ab51b9e7192103ee7c917624b063cc5ca2e11434164
 
 COPY --from=qemu-builder /qemu/arm-softmmu/qemu-system-arm /usr/local/bin/qemu-system-arm
 COPY --from=qemu-builder /qemu/aarch64-softmmu/qemu-system-aarch64 /usr/local/bin/qemu-system-aarch64
+COPY --from=qemu-builder /qemu/qemu-img /usr/local/bin/qemu-img
 COPY --from=fatcat-builder /fatcat/fatcat /usr/local/bin/fatcat
 
 ADD $RPI_KERNEL_URL /tmp/qemu-rpi-kernel.zip

entrypoint.sh

@@ -15,6 +15,8 @@ if [ ! -e $image_path ]; then
   fi
 fi
 
+qemu-img resize 4G
+
 if [ "${target}" = "pi1" ]; then
   emulator=qemu-system-arm
   kernel="/root/qemu-rpi-kernel/kernel-qemu-4.19.50-buster"
@@ -22,6 +24,7 @@ if [ "${target}" = "pi1" ]; then
   machine=versatilepb
   memory=256m
   root=/dev/sda2
+  extra=''
   nic='--net nic --net user,hostfwd=tcp::5022-:22'
 elif [ "${target}" = "pi2" ]; then
   emulator=qemu-system-arm
@@ -29,14 +32,16 @@ elif [ "${target}" = "pi2" ]; then
   memory=1024m
   kernel_pattern=kernel7.img
   dtb_pattern=bcm2709-rpi-2-b.dtb
-  nic=''
+  extra='dwc_otg.fiq_fsm_enable=0'
+  nic='-netdev user,id=net0 -device usb-net,netdev=net0'
 elif [ "${target}" = "pi3" ]; then
   emulator=qemu-system-aarch64
   machine=raspi3
   memory=1024m
   kernel_pattern=kernel8.img
   dtb_pattern=bcm2710-rpi-3-b-plus.dtb
-  nic=''
+  extra='dwc_otg.fiq_fsm_enable=0'
+  nic='-netdev user,id=net0 -device usb-net,netdev=net0'
 else
   echo "Target ${target} not supported"
   echo "Supported targets: pi1 pi2 pi3"
@@ -78,7 +83,7 @@ exec ${emulator} \
   ${nic} \
   --dtb "${dtb}" \
   --kernel "${kernel}" \
-  --append "rw earlyprintk loglevel=8 console=ttyAMA0,115200 dwc_otg.lpm_enable=0 root=${root} rootwait panic=1" \
+  --append "rw earlyprintk loglevel=8 console=ttyAMA0,115200 dwc_otg.lpm_enable=0 root=${root} rootwait panic=1 ${extra}" \
   --no-reboot \
   --display none \
   --serial mon:stdio