diff --git a/board/qemu/sh4-r2d/readme.txt b/board/qemu/sh4-r2d/readme.txt
index b0799e47a8..24c3676d8a 100644
--- a/board/qemu/sh4-r2d/readme.txt
+++ b/board/qemu/sh4-r2d/readme.txt
@@ -1,6 +1,6 @@
 Run the emulation with:
 
-  qemu-system-sh4 -M r2d -kernel output/images/zImage -drive file=output/images/rootfs.ext2,if=ide,format=raw -append "rootwait root=/dev/sda console=ttySC1,115200 noiotrap" -serial null -serial stdio -net nic,model=rtl8139 -net user # qemu_sh4_r2d_defconfig
+  qemu-system-sh4 -M r2d -kernel output/images/zImage -append "console=ttySC1,115200 noiotrap" -serial null -serial stdio -net nic,model=rtl8139 -net user # qemu_sh4_r2d_defconfig
 
 The login prompt will appear in the terminal that started Qemu.
 The graphical window is the framebuffer.
diff --git a/board/qemu/sh4eb-r2d/readme.txt b/board/qemu/sh4eb-r2d/readme.txt
index 9f3dd8b20b..577c54cd9d 100644
--- a/board/qemu/sh4eb-r2d/readme.txt
+++ b/board/qemu/sh4eb-r2d/readme.txt
@@ -1,6 +1,6 @@
 Run the emulation with:
 
-  qemu-system-sh4eb -M r2d -kernel output/images/zImage -drive file=output/images/rootfs.ext2,if=ide,format=raw -append "rootwait root=/dev/sda console=ttySC1,115200 noiotrap" -serial null -serial stdio -net nic,model=rtl8139 -net user # qemu_sh4eb_r2d_defconfig
+  qemu-system-sh4eb -M r2d -kernel output/images/zImage -append "console=ttySC1,115200 noiotrap" -serial null -serial stdio -net nic,model=rtl8139 -net user # qemu_sh4eb_r2d_defconfig
 
 The login prompt will appear in the terminal that started Qemu.
 The graphical window is the framebuffer.
diff --git a/configs/qemu_sh4_r2d_defconfig b/configs/qemu_sh4_r2d_defconfig
index e5570dcbab..8d3e96c9c5 100644
--- a/configs/qemu_sh4_r2d_defconfig
+++ b/configs/qemu_sh4_r2d_defconfig
@@ -7,7 +7,7 @@ BR2_SYSTEM_DHCP="eth0"
 BR2_TARGET_GENERIC_GETTY_PORT="ttySC1"
 
 # Filesystem
-BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_INITRAMFS=y
 # BR2_TARGET_ROOTFS_TAR is not set
 
 # Image
diff --git a/configs/qemu_sh4eb_r2d_defconfig b/configs/qemu_sh4eb_r2d_defconfig
index 468d6567ae..10c547e0c4 100644
--- a/configs/qemu_sh4eb_r2d_defconfig
+++ b/configs/qemu_sh4eb_r2d_defconfig
@@ -6,7 +6,7 @@ BR2_sh4eb=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttySC1"
 
 # Filesystem
-BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_INITRAMFS=y
 # BR2_TARGET_ROOTFS_TAR is not set
 
 # Image