Re: Ordering between PCI config space writes and MMIO reads?

From: Alan Cox <>
Date: 2006-10-25 07:24:23
Ar Maw, 2006-10-24 am 12:13 -0700, ysgrifennodd Roland Dreier:
>  1) Is this something that should be fixed in the driver?  The PCI
>     spec allows MMIO cycles to start before an earlier config cycle
>     completed, but do we want to expose this fact to drivers?  Would
>     it be better for ia64 to use some sort of barrier to make sure
>     pci_write_config_xxx() is strongly ordered with MMIO?

It is good to be conservative in this area. Some AMD chipsets at least
had ordering problems with some configurations in the K7 era.

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Received on Wed Oct 25 07:25:18 2006

This archive was generated by hypermail 2.1.8 : 2006-10-25 07:25:31 EST