commit e762a08b77d7e15fc2fec983f6f5b5481f7e4bfa
author Milton D. Miller II <miltonm@us.ibm.com> Wed Feb 24 12:04:05 2016 -0600
committer Milton D. Miller II <miltonm@us.ibm.com> Wed Feb 24 12:11:57 2016 -0600
tree 0abeb7a0bae72384bf938de64e6ba4578ca6adc6
parent ec0ba3c1ddd26ccd7bfee27b2b900f7c73401ad9

initfs: Use stty to drain output before reboot

To see all the messages during shutdown call stty cooked.

A side effect of setting any mode is it will call ioctl(TIOC_DRAIN)
to drain the buffers first without regard to any change in the mode.

Shutdown and flash update now show the final ouptut and "Rebooting"
message before the reboot system call.

Before:
+ set +x
Remaining mounts:
tmpfs / tmpfs rw,nosuid,nodev,mode=755 0 0
dev /dev devtmpfs rw,relatime,size=126384k,nr_inodes=31596,mode=755 0 0
proc /proc proc rw,relatime 0 0
sys /s

U-Boot 2013.07 (Feb 23 2016 - 10:21:23)

After:
+ set +x
Remaining mounts:
tmpfs / tmpfs rw,nosuid,nodev,mode=755 0 0
dev /dev devtmpfs rw,relatime,size=126384k,nr_inodes=31596,mode=755 0 0
proc /proc proc rw,relatime 0 0
sys /sys sysfs rw,relatime 0 0
tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
reboot: Restarting system

U-Boot 2013.07 (Feb 23 2016 - 10:21:23)

Signed-off-by: Milton Miller <miltonm@us.ibm.com>