Lu, Yinghai wrote:
Where to get USB-to-Serial or USB-to-USB device mentioned in the doc?
http://www.usb.org/developers/presentations/pres0602/john_keys.pdf
Here's the info on the PLX Hi-Speed USB 2.0 Debug Cable: http://www.plxtech.com/products/NET2000/NET20DC/default.asp
Here are some other adapters I've found to debug via I2C or SPI:
I2C Bus to USB or serial adapters http://www.mcc-us.com/catalog.htm#I2C%20Bus%20Host%20Adapters
I2C/SPI Host Adapter http://www.totalphase.com/products/aardvark/
I2C Bus to USB or serial adapters http://www.telos.info/products/
QBridge-I2C-USB http://www.qprotos.com/index.html
This adapter even has Linux tools: USB-I2C/SPI/GPIO Interface Adapter http://www.diolan.com/i2c/u2c12.html
with a probe like this that slides into the dimm socket: http://www.busboards.com/products/memory/ddrii/ddrii400dc/ddriidc.jpg http://www.busboards.com/products/memory/ddrii/ddrii400dc/index.html
-Bari