qemu_arm_versatile: use kernel 3.1 and add readme

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

board/qemu/arm-versatile/readme.txt

@@ -0,0 +1,6 @@
+Run the emulation with:
+
+  qemu-system-arm -M versatilepb -kernel output/images/zImage -drive file=output/images/rootfs.ext2,if=scsi -append "root=/dev/sda console=ttyAMA0,115200" -serial stdio
+
+The login prompt will appear in the terminal that started Qemu. The
+graphical window is the framebuffer.

configs/qemu_arm_versatile_defconfig

@@ -13,7 +13,7 @@ BR2_TARGET_ROOTFS_EXT2=y
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="2.6.38.8"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.1"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/arm-versatile/linux-2.6.38.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/arm-versatile/linux-3.1.config"
 BR2_LINUX_KERNEL_ZIMAGE=y