Re: [RFC PATCH 1/2] pci: don't assume pref memio are 64bit -v3

[Yinghai Lu]

On Thu, Apr 23, 2009 at 5:58 AM, Ivan Kokshaysky
<ink@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, Apr 22, 2009 at 07:03:33PM -0700, Yinghai Lu wrote:
>> to check the BAR support 64bit or not should be read from
>> pci_read_bases and pci_bridge_read_bases...
>
> pci_read_bases: take a closer look at decode_bar() function and
> PCI_BASE_ADDRESS_MEM_TYPE_64 flag.
>
> pci_bridge_read_bases: we cannot rely on the bits 0-3 of
> PCI_PREF_MEMORY_BASE providing correct information anyway.
> More reliable check for 64-bitness would be a test for
> PCI_PREF_BASE_UPPER32 register being r/w, which I think
> belongs in pci_bridge_check_ranges().

check bits 0-3 and check PCI_PREF_BASE_UPPER32 register being r/w ?

YH
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