lkml.org 
[lkml]   [1999]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: sym53c875E-0: PCI clock seems too high
Date
Andreas Bombe wrote:
>
> However, according to c't (which did overclocking tests on PCI), SCSI
> controllers can almost be expected to fail. Probably because they
> drive some internal clock from PCI or the chips are clocked from PCI
> and, unlike CPUs, are built only for 33MHz. SCSI controllers are
> apparently coupled to the bus clock tighter than other devices.

Hopefully it's for a different reason than that, as deriving a clock
from the PCI bus is an explicit violation of the bus spec. (think about
what happens when you underclock the bus, which is quite legal; changing
the clock in midstream and other things hostile to PLLs are also legal,
I believe.)

My own two cents on the issue - I've got an old socket 7 motherboard that
overclocks the PCI bus for higher FSB speeds, and the first time I did
that it ate my tulip card. That'll teach me...

--
............................................................................
Peter Desnoyers
162 Pleasant St. (617) 661-1979 pjd@fred.cambridge.ma.us
Cambridge, Mass. 02139 (978) 461-0402 (work) pjd@giga-net.com

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:54    [W:0.064 / U:0.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site