Samsung Z5

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Introduction

The Z5 has 4 tactile buttons and a touchpad. Screen resolution: 128 x 160 (RGB)

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Firmware

2 firmware updates are available here: http://www.anythingbutipod.com/forum/showthread.php?t=32690. The update is performed by placing the Z5Update.dat file in the root of the player or the System/Data folder, depending on the current version you're player is running.

Partitions

Name	Offset	Length
ufd0p0	16	16 (4096 KB)
ufd0p1	32	16 (4096 KB)
ufd0p2	48	64 (16384 KB)
ufd0p3	112	128 (32768 KB)
ufd0p4	240	3692 (945152 KB)

Update process

With the help of the Z5 updater (recovery) application we can restore the firmware through the STMP3600 recovery mode. A updater.sb as sent to the device. This ~1,8MB file is really complex since it includes some code to load a linux kernel with a rootfs-based recovery...Then a z5-fw.dat is sent to the user memory (through UMS) and the process of decryption + flashing begins! In the rootfs I extracted I found lots of interesting things: among these perhaps we can start some scripting through a start.sh placed into user memory!

Z5Update?.dat is a mixture of plain and encrypted bytes.

Meaning	Offset	Length
Header	0	0x38
Data	0x38	Size of the data
MD5 Encrypted data	0x38 + Size of the data	0x10

Header info	Offset	Length
Signature (SAMSUNG YEPP)	0	0xC
Unknown	0xC	0x4
Version	0x10	0x8
Region Code	0x18	0x4
Unknown (revision ?)	0x1C	0x4
Model	0x20	0x14
Size of the data	0x34	0x4

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Modes

To get the player to present itself as a STMP3600/Player Recovery Class device, hold the middle select button while connecting to USB from the off state. Keep in mind that this device has a sleep mode and the only way to truly turn it off is by pressing in the reset button on the bottom.

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Insides

• SoC = STMP3650
• NAND = K9K8G08UOM? 4G x 8 Bit NAND flash memory (http://www.datasheets.org.uk/pdf/1880611.pdf)
• LCD-TFT = lte182qq-f03-v2.2 (http://www.samsung.com/global/business/semiconductor/support/brochures/downloads/systemlsi/psg_all_product_200609.pdf)
• SDRAM = 128Mb Mobile SDRAM EOREX em488m1644vba-756 (http://www.datasheets.org.uk/pdf/1328385.pdf)

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Schematics & Stuff

YP-Z5 Schematics, Service Manual & more!

• Touchpad = ADC source + PINS (I guess to detect movement in action...or a press!!)
• FMRadio = is optional, but may be present (implement I2C? and probe the magic)

ADCChannel	Usage
ADC0	Tactile Buttons
ADC1	Microphone Power?
ADC2	Touchpad AX-
ADC3	Touchpad AY-
ADC4	Touchpad AX+
ADC5	Touchpad AY+

GPIO/other pins	Usage	Default State	Direction
PSWITCH	Power_Toggle	L	I
SSP_DATA1	SDRAM_PWR	N/A
GPMI_D00	Boot mode	N/A
GPMI_D01	Boot mode	N/A
GPMI_D02	Boot mode	N/A
GPMI_D03	Boot mode	N/A
GPMI_D09	LCD_RD	N/A
GPMI_D10	FM_BUS (toggle power)	N/A
GPMI_D12	USB_Detect	N/A
GPMI_D13	Hold_SW	N/A
PWM2	LCD_TP (toggle power?)	N/A
PWM3	BLU_ON_LCD	N/A
LCD_BUSY	Touchpad TY-	N/A	O
ROTARYA	Touchpad TX-	N/A	O
SSP_CMD	Touchpad TY+	N/A	I
SSP_DETECT	Touchpad TX+	N/A	I
SSP_DATA2	FM_INT (interrupt)	N/A
UART2_CTS	MUTE_ON	N/A	O
ROTARYB	DTV_DETECT	N/A	I/O

There are 2 UARTs. Need to see the output by using the original firmware. Some strings could be useful to decode/decrypt sb files and/or Z5Update?.dat file...

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Useful Links

• SigmaTelSTMP3xxx

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