Messages in this thread |  | | | Date | Mon, 29 Oct 2001 18:28:07 +0100 (MET) | | From | "Maciej W. Rozycki" <> | | Subject | Re: Linux 2.4.13-ac4 |
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On Mon, 29 Oct 2001, Henning P. Schmiedehausen wrote:
> Hm. If this is like the 8253 (ugh, way way back in the good old 8085 > days I really wired and programmed such a bugger on my CP/M system...), > then the problem is, that the 16 bit counter is read in two 8 bit portions. [...] > This will happen all the time, so printing out is neither a good idea > nor is the read problem described above an error. It is just a quirk > in using an 8 bit chip in an 16 bit environment without being able to > "latch" the count.
The 8254 is indeed upwards compatible to the 8253. Both provide a counter latch command and the 8254 has an additional "read back" command, which is also capable of latching counters.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available + - 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/
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