obmc-init.sh: Use u-boot env instead of password for emergency console

The password prompt doesn't work anymore. Since it relied on the
default password, remove the password prompt and just drop into
a shell if a new enable-initrd-debug-sh u-boot environment value is set.
The security implications are the same since the default
password is public and there is a need to have access to u-boot
to set the environment value.

If the environment value is not set, kernel panic the system.

Closes openbmc/openbmc#3649

Tested: Verified kernel panic if environment value was not set, and
        if it was set the emergency console dropped into a shell and basic
        linux commands worked:

Mounting read-write /dev/mtdblock5 filesystem failed.  Please fix and run
        mount /dev/mtdblock5 run/initramfs/rw -t jffs2 -o rw
or perform a factory reset with the clean-rwfs-filesystem option.
Try to manually fix.
After fixing run exit to continue this script, or reboot -f to retry, or
touch /takeover and exit to become PID 1 allowing editing of this script.
/bin/sh: can't access tty; job control turned off
/ #

(From meta-phosphor rev: 368550b2d259ac8d08c993b0d695f38aec8992fa)

Change-Id: I0431690b3b4facadbe224fc822d6bd06f35b51f5
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>

0 files changed, 0 insertions, 0 deletions