Gabriel Paubert wrote:
> No, both the RTC and the decrementer count nanoseconds, except that the 7
> LSB are not implemented because the timebase clock should have a period of
> 128 ns (7.8125 MHz, but according to Takashi Oe, many 601 systems did not
> bother to provide the exact frequency and are off by 11 parts in 4096 or
> so). As such the LSB can't be used to estimate randomness and the value
> must be shifted right by 7. So you need some conditional code (or boot
> time patching). At this point you can throw in the high order part
> (RTCU/TBU) for additional randomization (RTCU changes much faster on 601,
> once per second, than on the other processors).
Have you got any links to information on boot time patching?
-- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:31 EST