The serial cable used with the older TiVo boxes should work although I do not have a Galileo board yet to confirm this.
Originally this cable was used to communicate with satellite boxes but it could also be used to get access to the TiVo Linux serial console when you are working with a hacked TiVo.
Cables can be ordered from TiVo here:
Around $16 including shipping.
I see a few of these cables on eBay as well for about $10 including shipping.
Search for "tivo serial cable"
Here is the pinout of the TiVo cable if someone can confirm this is the same as what is needed for the Galileo board:
We use two parts to make the cable:
1. for USB to RS232
2. and RS232 to 3.5mm jack - RapidRun #87087
You may find cheaper alternatives or make you own solutions, just ensure the audio jack is pinned like below , and RS232 not TTL (see here for difference https://www.sparkfun.com/tutorials/215)
The spec is included in the open source schematic (pg17/28)
For a 3 pin audio jack, the connections are as follows:
- Sleeve = Ground
- Ring = RXD (Input to Clanton)
- Tip = TXD (Output from Clanton)