> Now it seems to work. But I receive much info. Here is a very short sampl= e Once again we get back to the question of what are you trying to accomplish= .. The question of what is the BIOS address simply makes no sense. The /proc/kallsyms contains (depending on your box) a few dozen possible answers. But unless you are editing the Linux operating system none of those possible answers are useful. Even then, the values are of no use; only the symbols. There are an almost unlimited number of other possible answers, once again, depending on what you are trying to accomplish. So again, what are you trying to do? Also, the /sda1 partition is mounted on /media, so clearly it is a removable device. I assume the hard disk you are talking about is a USB drive or something similar, and [perhaps more importantly, wasn't the boot device. An SD card is not "flash memory" but a block structured device, which appears to not be mounted (i.e. doesn't exist at the moment) in your reply to Yigit Turgut. The particular technology used to implement the block device doesn't matter; it is a disk that happens to not spin. I disagree that /dev/mem is the SDRAM. /dev/mem is the memory. No specific technology is implied, but if SDRAM is the only RAM you have, then probably much of /dev/mem is SDRAM. One more time. The question "what is the address" doesn't make any sense by itself. The answer depends on what you want to do with it. --McD --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .