Re: Question about PATA Sil680 Cache Line Size and Performance Degradation on ARM XScale

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On Wed, 21 Feb 2007 15:56:28 -0700
"Fajun Chen" <fajunchen@xxxxxxxxx> wrote:

> Hi Folks,
> 
> I've noticed the following code in both pata_sil680.c and IDE code siimage.c
>         /* FIXME: double check */
> 	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, (class_rev) ? 1 : 255);
> I was unable to find the recommended setting in Sil680 document. Could
> someone explain the rational behind the code above? Does it need to be
> adjusted on different processors for PCI read/write performance?

The code is inherited from the original bits by Andre Hedrick who had
access to the chip errata documents, which afaik have never been
published. 

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