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From: Stefan Esser <se@FreeBSD.ORG>
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Date: Wed, 28 May 1997 03:10:04 -0700 (PDT)
Message-Id: <199705281010.DAA13689@freefall.freebsd.org>
To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG
Subject: cvs commit: src/sys/pci pci_compat.c
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se          1997/05/28 03:10:03 PDT

  Modified files:
    sys/pci              pci_compat.c 
  Log:
  Add consistency check to the functions that map port or memory ranges:
  Return failure, if the enable bit corresponding to the map type has not
  been set in the command register. This feature was requested by Justin
  Gibbs, who pointed out that some early PCI to PCI bridges do not correctly
  support memory windows (I assume because of the risk of deadlocks that
  have been taken care of in the PCI 2.2 spec) and that some BIOS clears
  the memory address decode enable bit in the command register of the PCI
  device, if it finds them behind such a bridge.
  
  Revision  Changes    Path
  1.2       +16 -3     src/sys/pci/pci_compat.c