qemu: add new board support for qemu-system-sparc64

SPARC64 builds can be tested with Qemu.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/qemu/sparc64-sun4u/linux-4.1.config

@@ -0,0 +1,27 @@
+# CONFIG_SWAP is not set
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_EMBEDDED=y
+CONFIG_MODULES=y
+CONFIG_PCI=y
+CONFIG_SUN_OPENPROMFS=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_ATA=y
+CONFIG_PATA_CMD64X=y
+CONFIG_NETDEVICES=y
+CONFIG_NE2K_PCI=y
+CONFIG_SERIAL_SUNSU=y
+CONFIG_SERIAL_SUNSU_CONSOLE=y
+CONFIG_EXT4_FS=y
+CONFIG_EXT4_USE_FOR_EXT23=y 
+CONFIG_TMPFS=y
+CONFIG_NLS=y
+CONFIG_NLS_DEFAULT="utf-8"
+CONFIG_MAGIC_SYSRQ=y

board/qemu/sparc64-sun4u/readme.txt

@@ -0,0 +1,7 @@
+Run the emulation with:
+
+  qemu-system-sparc64 -M sun4u -kernel output/images/vmlinux -append "root=/dev/sda console=ttyS0,115200" -serial stdio output/images/rootfs.ext2
+
+The login prompt will appear in the terminal that started Qemu.
+
+Tested with QEMU 2.3.0

configs/qemu_sparc64_sun4u_defconfig

@@ -0,0 +1,19 @@
+# Architecture
+BR2_sparc64=y
+BR2_sparc_v9=y
+
+# filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+# BR2_TARGET_ROOTFS_TAR is not set
+
+# Lock to 4.1 headers to avoid breaking with newer kernels
+BR2_KERNEL_HEADERS_VERSION=y
+BR2_DEFAULT_KERNEL_VERSION="4.1"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_1=y
+
+# Linux kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.1"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/sparc64-sun4u/linux-4.1.config"