riscv/mb/qemu: fix qemu invocation comment

Change-Id: I773fb39801f180fead584942dfb385fcde9d2680
Signed-off-by: Philipp Hug <philipp@hug.cx>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80262
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: ron minnich <rminnich@gmail.com>
diff --git a/src/mainboard/emulation/qemu-riscv/Kconfig b/src/mainboard/emulation/qemu-riscv/Kconfig
index 091c432..d915d68 100644
--- a/src/mainboard/emulation/qemu-riscv/Kconfig
+++ b/src/mainboard/emulation/qemu-riscv/Kconfig
@@ -1,8 +1,7 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
 # To execute, do:
-# util/riscv/make-spike-elf.sh build/coreboot.rom build/coreboot.elf
-# qemu-system-riscv64 -M virt -m 1024M -nographic -kernel build/coreboot.elf
+# qemu-system-riscv64 -M virt -m 1024M -nographic -bios build/coreboot.rom
 
 
 if BOARD_EMULATION_QEMU_RISCV_RV64
diff --git a/util/qemu/Makefile.mk b/util/qemu/Makefile.mk
index 077fde7..42441df 100644
--- a/util/qemu/Makefile.mk
+++ b/util/qemu/Makefile.mk
@@ -29,6 +29,10 @@
 QEMU-$(CONFIG_BOARD_EMULATION_QEMU_AARCH64)	?= qemu-system-aarch64 \
 	-M virt,secure=on,virtualization=on -cpu cortex-a53 -m 1G
 
+QEMU-$(CONFIG_BOARD_EMULATION_QEMU_RISCV_RV64)	?= qemu-system-riscv64 -M virt
+
+QEMU-$(CONFIG_BOARD_EMULATION_QEMU_RISCV_RV32)	?= qemu-system-riscv32 -M virt
+
 QEMU-$(CONFIG_BOARD_EMULATION_QEMU_X86_I440FX)	?= qemu-system-x86_64 -M pc
 
 QEMU-$(CONFIG_BOARD_EMULATION_QEMU_X86_Q35)	?= qemu-system-x86_64 -M q35