very small qemu-only configuration

Makefile

@@ -124,7 +124,8 @@ all: $(build)/$(BOARD)/coreboot.rom
 else ifeq "$(CONFIG_LINUXBOOT)" "y"
 all: $(build)/$(BOARD)/linuxboot.rom
 else
-$(error "$(BOARD): neither CONFIG_COREBOOT nor CONFIG_LINUXBOOT is set?")
+$(warn "$(BOARD): neither CONFIG_COREBOOT nor CONFIG_LINUXBOOT is set?")
+all: $(build)/$(BOARD)/bzImage $(build)/$(BOARD)/initrd.cpio.xz
 endif
 
 # Disable all built in rules

boards/qemu-tiny/qemu-tiny.config

@@ -0,0 +1,46 @@
+# Configuration for building a coreboot ROM that works in the.
+# the qemu emulator.  Note that the TPM does not work, so this
+# will just drop into the recovery shell.
+export CONFIG_LINUXBOOT=n
+export CONFIG_COREBOOT=n
+#CONFIG_LINUXBOOT_BOARD=qemu
+CONFIG_LINUX_CONFIG=config/linux-tiny.config
+
+ifeq "$(CONFIG_UROOT)" "y"
+CONFIG_BUSYBOX=n
+else
+CONFIG_KEXEC=y
+CONFIG_QRENCODE=n
+CONFIG_TPMTOTP=n
+CONFIG_POPT=y
+CONFIG_FLASHTOOLS=n
+CONFIG_FLASHROM=n
+CONFIG_PCIUTILS=y
+CONFIG_UTIL_LINUX=y
+CONFIG_CRYPTSETUP=y
+CONFIG_GPG2=y
+CONFIG_LVM2=y
+CONFIG_MBEDTLS=y
+CONFIG_DROPBEAR=y
+CONFIG_NEWT=n
+CONFIG_SLANG=n
+endif
+
+CONFIG_LINUX_ATA=n
+CONFIG_LINUX_AHCI=n
+CONFIG_LINUX_USB=n
+CONFIG_LINUX_E1000=n
+
+export CONFIG_BOOTSCRIPT=/bin/generic-init
+export CONFIG_TPM=n
+
+#run: coreboot.intermediate
+run:
+	-qemu-system-x86_64 \
+		--machine q35 \
+		--serial /dev/tty \
+		--device virtio-net,netdev=net0 \
+		--netdev user,id=net0,hostfwd=tcp::5555-:22 \
+		--kernel $(build)/$(BOARD)/bzImage \
+		--initrd $(build)/$(BOARD)/initrd.cpio.xz
+	stty sane