qemu_sparc: add new qemu defconfig

Add a new qemu sample config for the SPARC architecture.

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

board/qemu/sparc-ss10/readme.txt

@@ -0,0 +1,7 @@
+Run the emulation with:
+
+  qemu-system-sparc -M SS-10 -kernel output/images/zImage -drive file=output/images/rootfs.ext2 -append "root=/dev/sda console=ttyS0,115200" -serial stdio
+
+The login prompt will appear in the terminal that started Qemu.
+The graphical window is the framebuffer.
+

configs/qemu_sparc_ss10_defconfig

@@ -0,0 +1,14 @@
+# Architecture
+BR2_sparc=y
+BR2_sparc_supersparc=y
+
+# filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+# BR2_TARGET_ROOTFS_TAR is not set
+
+# Linux kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.1"
+BR2_LINUX_KERNEL_DEFCONFIG="sparc32"
+BR2_LINUX_KERNEL_ZIMAGE=y