920-0614-03

The 920-0614-03 is seemingly a development/prototype iPod Nano 4G (or possibly iPod Touch 2G board?). It appeared on a bunch of eBay auctions around September 2023.

Specs

SoC: S5L8729

Flash: Usually desoldered

DRAM: To be checked

UART

The boards has at least two ways to access UART:

1. Over DE9 connector.

1. Over USB/Serial bridge.

1. Over 30-pin connector.

TODO: Figure out which serial is which, and document reanimating DE9/USB.

Power

The board runs from either the 30-pin connector by itself (although it can sometimes be unstable) or from 5V over a DC power jack (which provides a 4v-ish supply which simulates the devices' battery).

JTAG

JTAG is available over the 30 pin connector, but is also seemingly locked out as on production devices.

Getting code to run

wInd3x works on the device. On devices without Flash attempting to run the standard WTF causes a reset.

Differences from production device

So far, it seems like the SoC present on the board is no different from production SoCs.

CHIPID

Seems like a perfectly standard S5L8720:

3d100000: 0100 0000 0100 0011 0f18 2087 104f 6d76  .......... ..Omv
3d100010: d700 0000 0300 0000 0000 0000 0000 0000  ................

Pins

As the board has clearly labeled and accessible GPIO pins / configuration straps, it's a good candidate to reverse engineer pin functionality as used in the production device.

S5L8720 GPIO	Function on board
91	'DFU' button