I have to ask:
Have you down-loaded and looked at the linuxbios code?
The code for enabling cache and configuring MTRRs is all there. There
is also code for the 440BX, I use it every day. It sounds like you are
starting from scratch.
Take a look at src/mainboard/gigabit/ga-6bxc/ and
src/northbridge/intel/440bx
On the other hand, how did you get your SDRAM configured? The BX code
doesn't support SPD config of the SDRAMs at this time and is hard coded
for my very specific SDRAM configuration.
Sorry if a come off a little strange or hard, but I'm puzzled by the
level of success you seem to have without knowing what is in the
linuxbios sources.
Cheers!
Ty
"Terrell, Bill" wrote:
>
> Thanks to all (Tyson, Peter, Eric, Denis) for the info.
>
> I enabled the L1 cache by clearing CD/NW bits in CR0 and then setup a variable MTRR
>(reg 0) for the
> size of my main memory (memory type = writeback). Seems to work okay.
>
> Do I need to enable caching of page directories via PCD/PWT in CR3 at boot time or
>will this be done
> by Linux later on?
>
> Also, does anyone know of any Linuxbios support for the 440BX chipset since it is
>the one I use on
> my board.
>
> Thanks again,
> -bill
>
> ----- Original Message -----
> From: "Denis Dowling" <[EMAIL PROTECTED]>
> To: "Terrell, Bill" <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Tuesday, February 27, 2001 6:26 PM
> Subject: Re: how to enable cache for Pentium III (coppermine) chip
>
> > "Terrell, Bill" wrote:
> > >
> > > does anyone have any code which enables the L2 cache for the Pentium
> > > III (coppermine) chip?
> >
> > As stated earlier the coppermine chip does not need L2 cache setup code.
> > Any Intel CPU with cpuid >= 0x680 has cache on the die and is setup
> > correctly at reset. The first few lines of intel_l2_configure() check
> > for this. All of the rest of the mess for L2 cache enable is for the PII
> > with the external L2 cache chips.
> >
> > Regards,
> > Denis.
> >
--
Tyson D Sawyer iRobot Corporation
Senior Systems Engineer Real World Interface Div.
[EMAIL PROTECTED] Robots for the Real World
603-532-6900 ext 206 http://www.irobot.com
