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

# 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

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

# 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"