From the very beginning I had on my personal Dell D400 in the Windows XP Device Manager one unidentified device. I was ignoring it for a very long time, but every time I look there, the big ugly yellow question mark was there. The system performed well, but I was still thinking, whether there is some super usefull device I'm missing only because I was unable to find some driver.
All the almighty device identifiers failed. Then I took the device info provided by Windows
PCI\VEN_104C&DEV_8204&CC_0880
and put it directly into Google. I found that the device was something like
TI UltraMedia Firmware Loader Device and that the drivers can be downloaded from Dell Support Page (see
this)
