It's a workaround to fix yocto bug:
[Bug 414][PPC] kernel panic when booting poky-image-sdk-qemuppc through UNFS
Liming Wang (1):
scripts/runqemu: disable unfs boot mode for qemuppc
scripts/runqemu | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)