OYO Hacking

Projects
Participants	Arda Xi, The JinX
Skills
Status	Active
Niche	Software
Purpose	Fun

All information on modding/hacking the OYO E-reader

Hardware

CPU Info

Processor	: ARM926EJ-S rev 5 (v5l)
BogoMIPS	: 199.47
Features	: swp half fastmult edsp java 
CPU implementer	: 0x41
CPU architecture: 5TEJ
CPU variant	: 0x0
CPU part	: 0x926
CPU revision	: 5
Cache type	: write-back
Cache clean	: cp15 c7 ops
Cache lockdown	: format C
Cache format	: Harvard
I size		: 16384
I assoc		: 4
I line length	: 32
I sets		: 128
D size		: 16384
D assoc		: 4
D line length	: 32
D sets		: 128

Hardware	: SMDK2416
Revision	: 0000
Serial		: 0000000000000000

Files

To download

• Firmware: File:Oyofw.tar.bz2
• Thalia Sources SG060B00_V009.tgz

On the system

• /usr/local/qisda/etc/index.html (browser startup page)

Installed Apps

To run Qengineer (diagnostics): Kill linuxrc, then qbookapp, then run /qdutil/em/start /qdutil/em/QEngineer

Getting root

The Frank's wiki page above is quite useful, but a lot of data is outdated and/or unnecessary. The following is a simple guide to do whatever you like to your OYO.

First, you will want to run the following command to get your kernel to accept the OYO as a serial device.

sudo modprobe usbserial vendor=0x0525 product=0xa4a6 or sudo modprobe usbserial vendor=0x0525 product=0xa4a5 (Check with lsusb)

To get your OYO to behave like a serial device, grab a MicroSD card, create a file called usbdebug on it, put it into your OYO and reboot it while having it attached to your computer.

touch usbdebug

After the OYO has booted, you will want to open a serial connection to it.

sudo picocom --b 115200 --f n --p on --d 8 /dev/ttyUSB0

If you get the following error: FATAL: failed to config device /dev/ttyUSB0: Cannot set the device attributes: Invalid argument Make sure you have the correct usb device id 0xa4a6 or 0xa4a6. And try reloading the usbserial module:

• rmmod usbserial
• sudo modprobe usbserial vendor=0x0525 product=0xa4a5 (or 0xa4a6)

If you get garbage, you can try the following:

• Keep pressing enter until you get a prompt like this.
• do a sudo killall -9 picocom, and a sudo cat /dev/ttyUSB0 and press cltr-c. And start over with picocom. You might need to reload the usbserial module here.
• If this doesn't help, try rebooting your machine or a different machine, this 'feature' is flaky, it's why you want an sshd.

Samsung login:

You can then login, using the login root and the password SReader.

At this point, I suggest changing the root password.

passwd

Because the device copies the content of /mnt/etc to /etc an extra step is required.

cp /etc/passwd /mnt/etc/passwd

More information

• Links: Revspace wiki
• Shell access and more: Franks Wiki
• Info/sources: OpenInkpot
• oyohack wiki: Gitorious