linux-kernel - Re: Linux 2.6.30-rc8 [also: VIA Support]

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Date:	Thu, 4 Jun 2009 16:01:30 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Harald Welte <HaraldWelte@...tech.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.30-rc8 [also: VIA Support]

On Thu June 4 2009, Dave Jones wrote:
> On Thu, Jun 04, 2009 at 01:12:43PM -0500, Michael S. Zick wrote:
>  > On Thu June 4 2009, Harald Welte wrote:
>  > > On Thu, Jun 04, 2009 at 11:21:28AM -0500, Michael S. Zick wrote:
>  > > 
>  > > > That is one of my pending questions - -
>  > > > (It is included as a comment at the appropriate point in my patchset.)
>  > > > 
>  > > > The VIA processors have MCR's not MTRR's - -
>  > > 
>  > > AFAIK, that was true for processors like the Winhcip / C6, i.e. earlier than
>  > > the C3.  The C3, C7 and later support 8 intel-style MTRR's.
>  > > 
>  > 
>  > Super!  A specific breakage!
>  > 
>  > The c7 setup code is re-using the c6 setup code (MCR's) - -
>  > Will "if 0" out the appropriate parts and arrange for the MTRR setup.
> 
> It's not touching the MCRs.   C7's are family 6. The MCR code is only
> called for family 5. (Winchips)   Look at the switch statement
> in init_centaur()
> 

Yup, mis-read that one - -

        case 6:
                init_c3(c);
                break;

= = = =

But while your here, what is your opinion on this one,
in: int __init pcibios_init(void)

- - - - -
        pci_cache_line_size = 32 >> 2;
        if (c->x86 >= 6
        && (c->x86_vendor == X86_VENDOR_AMD) || (c->x86_vendor == X86_VENDOR_CENTAUR))
                pci_cache_line_size = 64 >> 2;  /* K7 & K8 and VIA C7-M */
        else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
                pci_cache_line_size = 128 >> 2; /* P4 */

Mike
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