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"echo" just writes the following stuff to standard output. "-n" tells it to not add a linefeed character at the end. "-e" tells it to enable interpretation of backslash escapes. "\xNN" echoes the binary byte 0xNN. So, "\x00\xff" would echo the two bytes 0x00 and 0xff to standard output. I didn't put quotes around the input, so I had to escape the backslashes: '\x00\xff' == \\x00\\xff (no quotes). And of course, " > hwconfig" redirects standard output to the file named "hwconfig". So, my command just wrote the two binary bytes 0x00 and 0xff to the file named "hwconfig". I suspect that writing such garbage input to that file caused problems for uboot and made it stop and bring up an interactive session.
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