Create goke-learning from original fw

goke-learning from original fw

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+# OpenIPC Wiki
+[Table of Content](../index.md)
+
+GOKE soc: Learning from original firmware
+-----------------------------------------
+
+### Prepare the enviroment
+Over the UART interface it is possible to get into a limited shell, but this shell does not load full working system.
+```
+setenv bootargs ${bootargs} single init=/bin/sh
+boot
+
+```
+
+Once we are in limited shell it is need to mount ROM filesystem:
+
+```
+mount -t jffs2 /dev/mtdblock3 /rom
+```
+
+Also wil be great to mount sd card to copy some files:
+
+```
+mount
+mount -a
+mount /dev/mmcblk0p1 on /mnt/s0
+```
+
+### Modifying the system
+on /rom filesystem you can edit the /room/etc/passwd file but once the device restarts it will be set to default, this happends because there is a guide bin file writing to passwd file on each start, so we need to modify this executable.
+
+copy system.dat to sd card
+
+```
+cp /rom/system.dat /mnt/s0
+```
+
+on a linux computer it is need to unsquahfs system.dat, do some changes and resquashfs:
+
+```
+mkdir squashfs-temp
+cd squashfs-temp
+
+unsquashfs system.dat
+```
+
+find guide file and hexedit to modify where "/etc/passwd" is writen and change one leter, for example "/etc/passwT". This file will be created on start instead of passwd replaced.
+
+re squash the file system:
+
+```
+mksquashfs ./squashfs-root ./file -comp xz -no-xattrs -noappend -no-exports -all-root -quiet -b 131072
+```
+
+and copy back from sd card to /rom directory on goke soc.
+
+now you can edit /rom/etc/passwd with your own pass, and whe you restart the device you will have full working system with your own pass.
+