BBB SD Card Mounted ro

root@arm:~# mount
/dev/root on / type ext4 (ro,relatime,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=253436k,nr_inodes=63359,mode=755)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,relatime)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=25,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
mqueue on /dev/mqueue type mqueue (rw,relatime)
tmpfs on /run/user type tmpfs (rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
securityfs on /sys/kernel/security type securityfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)
root@arm:~# cat /etc/fstab
# UNCONFIGURED FSTAB FOR BASE SYSTEM
/dev/mmcblk0p2  /  auto  errors=remount-ro  0  1
root@arm:~# lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
mmcblk1boot0 179:16   0     1M  1 disk
mmcblk1boot1 179:24   0     1M  1 disk
mmcblk0      179:0    0   7.4G  0 disk
├─mmcblk0p1  179:1    0    12M  0 part
└─mmcblk0p2  179:2    0   7.4G  0 part /
mmcblk1      179:8    0   1.8G  0 disk
├─mmcblk1p1  179:9    0    96M  0 part
└─mmcblk1p2  179:10   0   1.7G  0 part
root@arm:~# sudo update-initramfs -ck `uname -r`
update-initramfs: Generating /boot/initrd.img-3.15.10-bone8
touch: cannot touch `/boot/initrd.img-3.15.10-bone8.new': Read-only file system
mktemp: failed to create directory via template `/var/tmp/mkinitramfs_XXXXXX': Read-only file system
update-initramfs: failed for /boot/initrd.img-3.15.10-bone8 with 1.
root@arm:~#