mirror of https://github.com/OpenIPC/wiki.git
58 lines
1.8 KiB
Markdown
58 lines
1.8 KiB
Markdown
# OpenIPC Wiki
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[Table of Content](../index.md)
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Goke SoC: Learning from original firmware
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-----------------------------------------
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### Prepare the enviroment
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Over the UART interface, it is possible to temporarily interrupt the normal booting
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sequence and drop into a limited Linux shell at early stage of system startup.
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```
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setenv bootargs ${bootargs} single init=/bin/sh
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boot
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```
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This shell won't load the full working system, so you have to amend it manually.
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First, mount `/rom` filesystem:
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```
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mount -t jffs2 /dev/mtdblock3 /rom
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```
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Mount the rest of mounting points from `/etc/fstab`:
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```
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mount -a
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```
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Also mount the SD card to copy files to and from:
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```
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mount /dev/mmcblk0p1 on /mnt/s0
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```
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### Modifying the system
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On `/rom` filesystem, you can edit the `/room/etc/passwd` file but once the
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device restarts it will be reset to default. This happens because there is a
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guide bin file recreating `passwd` file on each start, so we need to modify
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that executable.
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Copy `system.dat` to an SD card:
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```
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cp /rom/system.dat /mnt/s0
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```
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On a linux computer, unpack `system.dat` file using `unsquashfs`:
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```
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mkdir squashfs-temp
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cd squashfs-temp
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unsquashfs system.dat
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```
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Find guide file and edit its content in a hex-editor to modify the name of the
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file where password is written on every restart. Search for `/etc/passwd` and
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change a letter in its name to something different, like `/etc/passwT`.
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Pack the squash file system using `mksquashfs`:
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```
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mksquashfs ./squashfs-root ./file -comp xz -no-xattrs -noappend -no-exports -all-root -quiet -b 131072
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```
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and copy it from the SD card back to `/rom` directory on the camera.
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Now you can replace the password in `/rom/etc/passwd` with your own password, and when
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you restart the device, you will have full working system with your own password.
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