[Analogus]

First of all the code when typing in MOUNT in the telnet terminal:

Welcome to Kindle!

#################################################
#  N O T I C E  *  N O T I C E  *  N O T I C E  # 
#################################################
Rootfs is mounted read-only. Invoke mntroot rw to
switch back to a writable rootfs.
#################################################
[root@kindle root]# mntroot rw
system: I mntroot:def:Making root filesystem writeable
[root@kindle root]# mount
rootfs on / type rootfs (rw)
/dev/root on / type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
none on /proc type proc (rw,nosuid,nodev,noexec,relatime)
none on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev type tmpfs (rw,relatime,mode=755)
tmpfs on /dev/shm type tmpfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /var type tmpfs (rw,relatime,size=32768k)
tmpfs on /mnt/kfxcache type tmpfs (rw,relatime,size=256000k)
/dev/loop/2 on /usr/share/X11/xkb type squashfs (ro,noatime,nodiratime)
/dev/loop/3 on /usr/java/lib/fonts type squashfs (ro,noatime,nodiratime)
/dev/loop/4 on /etc/kdb.src type squashfs (ro,noatime,nodiratime)
/dev/loop/5 on /usr/lib/locale type squashfs (ro,noatime,nodiratime)
/dev/loop/6 on /usr/share/keyboard type squashfs (ro,noatime,nodiratime)
/dev/loop/7 on /opt/var/local type squashfs (ro,noatime,nodiratime)
/dev/mmcblk0p3 on /var/local type ext3 (rw,relatime,errors=continue,barrier=0,data=writeback)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
fsp on /mnt/us type fuse.fsp (rw,nosuid,nodev,noatime,user_id=0,group_id=0,allow_other)
/dev/loop/8 on /var/local/font/mnt/ja_font type cramfs (ro,noatime,nodiratime)
/dev/loop/9 on /var/local/font/mnt/zh-Hans_font type cramfs (ro,noatime,nodiratime)
tmpfs on /var/linkss type tmpfs (rw,relatime,size=4096k)
tmpfs on /usr/share/blanket/screensaver type tmpfs (rw,relatime,size=4096k)
/dev/loop/0 on /mnt/base-us type vfat (rw,noexec,noatime,nodiratime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
tmpfs on /chroot/dev/log type tmpfs (rw,relatime,mode=755)
tmpfs on /chroot/dev/random type tmpfs (rw,relatime,mode=755)
tmpfs on /chroot/dev/urandom type tmpfs (rw,relatime,mode=755)
tmpfs on /chroot/dev/shm type tmpfs (rw,relatime)
none on /chroot/sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /chroot/var/cache type tmpfs (rw,relatime,size=32768k)
tmpfs on /chroot/var/lock type tmpfs (rw,relatime,size=32768k)
tmpfs on /chroot/var/run type tmpfs (rw,relatime,size=32768k)
/dev/loop/4 on /chroot/etc/kdb.src type squashfs (ro,noatime,nodiratime)
/dev/mmcblk0p3 on /chroot/var/local type ext3 (rw,relatime,errors=continue,barrier=0,data=writeback)
fsp on /chroot/mnt/us type fuse.fsp (rw,nosuid,nodev,noatime,user_id=0,group_id=0,allow_other)
/dev/root on /chroot/etc/fonts type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/etc/gtk-2.0 type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/etc/pango type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/etc/resolv.d type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/usr/share type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/usr/ssl type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/loop/6 on /chroot/usr/share/keyboard type squashfs (ro,noatime,nodiratime)
/dev/loop/3 on /chroot/usr/java/lib/fonts type squashfs (ro,noatime,nodiratime)
/dev/loop/2 on /chroot/usr/share/X11/xkb type squashfs (ro,noatime,nodiratime)
/dev/root on /chroot/usr/lib/pango type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
/dev/loop/5 on /chroot/usr/lib/locale type squashfs (ro,noatime,nodiratime)
[root@kindle root]#

Second: thank you as always for your detailed answer!

CRAMFS is found two times somewhere around line 30, tmpfs a couple of times.

What I intendet to to is do overwrite the 4 OpenDyslexic-fonts with renamed fonts (MinionPro) I really use. I don't like those kindergarten-fonts and the font-hack is not working well on 5.8.7 (I'm able to change Bookerly to whatever I want. but Bookerly is my most favorite font. I want to change OpenDysexic but that never worked.)