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Update and rename goke-learning from original fw.md to goke-learning-from-original-firmware.md

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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.

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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 temporarily interrupt the normal booting
sequence and drop into a limited Linux shell at early stage of system startup.
```
setenv bootargs ${bootargs} single init=/bin/sh
boot
```
This shell won't load the full working system, so you have to amend it manually.
First, mount `/rom` filesystem:
```
mount -t jffs2 /dev/mtdblock3 /rom
```
Mount the rest of mounting points from `/etc/fstab`:
```
mount -a
```
Also mount the SD card to copy files to and from:
```
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 reset to default. This happens because there is a
guide bin file recreating `passwd` file on each start, so we need to modify
that executable.
Copy `system.dat` to an SD card:
```
cp /rom/system.dat /mnt/s0
```
On a linux computer, unpack `system.dat` file using `unsquashfs`:
```
mkdir squashfs-temp
cd squashfs-temp
unsquashfs system.dat
```
Find guide file and edit its content in a hex-editor to modify the name of the
file where password is written on every restart. Search for `/etc/passwd` and
change a letter in its name to something different, like `/etc/passwT`.
Pack the squash file system using `mksquashfs`:
```
mksquashfs ./squashfs-root ./file -comp xz -no-xattrs -noappend -no-exports -all-root -quiet -b 131072
```
and copy it from the SD card back to `/rom` directory on the camera.
Now you can replace the password in `/rom/etc/passwd` with your own password, and when
you restart the device, you will have full working system with your own password.