lkml.org 
[lkml]   [2005]   [Oct]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] via82cxxx IDE: Support multiple controllers
From
Date
On Mer, 2005-10-12 at 18:52 +0100, Alan Cox wrote:
> On Mer, 2005-10-12 at 16:57 +0100, Daniel Drake wrote:
> > Uh, looks like the kernel just assumes 33mhz unless overriden by the user. Is
> > this assumption generally accurate?
> > If it is not, then there's probably no point displaying timing info...
>
> A small number of 486 systems use 25Mhz, some boards allow overclock at
> 37.5Mhz on the PCI. I've been looking at this the past couple of days
> for the libata via driver which I've been porting over and unfortunately
> having been through the Northbridge manuals I can find no way to ask the
> chipset what the PCI clock is set too.

Ok I found what seems to be a pattern for the early chipsets with 25MHz
support.

If the bus speed of your 486 is 25Mhz the chipset is at 25MHz as is your
IDE (ie 486/25, DX2/50, 3/75 - not sure about 4/100 etc). Now does
anyone know how you find out if the CPU is 25MHz bus clocked on a 486 8)

-
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/

\
 
 \ /
  Last update: 2005-10-13 13:19    [W:0.922 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site