qemu/ppc-mpc8544ds: add new sample config

Add new powerpc-mpc8544ds sample qemu config.
Useful for SPE ABI testing.

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

board/qemu/powerpc-mpc8544ds/readme.txt

@@ -0,0 +1,6 @@
+Run the emulation with:
+
+ qemu-system-ppc -M mpc8544ds -kernel output/images/vmlinux -serial stdio
+
+The login prompt will appear in the terminal that started Qemu.
+

configs/qemu_ppc_mpc8544ds_defconfig

@@ -0,0 +1,21 @@
+# Architecture
+BR2_powerpc=y
+BR2_powerpc_8548=y
+
+# filesystem
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_ROOTFS_INITRAMFS=y
+
+# Lock to 3.3 headers to avoid breaking with newer kernels
+BR2_KERNEL_HEADERS_3_3=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.3.4"
+BR2_LINUX_KERNEL_DEFCONFIG="mpc85xx"
+BR2_LINUX_KERNEL_VMLINUX=y
+
+# Serial port config
+BR2_TARGET_GENERIC_GETTY=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"