It's not about searching for specific values either. Sometimes you find some unknown value that's not reflected in the out of date or simply wrong datasheet. Wh

It's not about searching for specific values either. Sometimes you find some unknown value that's not reflected in the out of date or simply wrong datasheet. What does it do? Well, it's quite likely it does something related to other values that use the same mask, so you can try to figure out the mask by searching for lexical subsets of the value, which because of the magic of base 16 is an extremely effective strategy in finding related things. Much harder now with underscores. And it's also about being able to search Google for a found constant, which indexes other people's code. There have been plenty of occasions where I found newer version of proprietary driver code that the hardware manufacturer claimed it either lost or doesn't exist and won't provide to us by simple searching for constants on Google... But more often is to just find drivers from other operating systems that already support that device, or mailing lists or forums where other people try to reverse engineer the device.