From: Alan Cox Old ISA/VESA systems sometimes put tertiary IDE controllers at addresses 0x1e8, 0x168, 0x1e0 or 0x160. Linux thus probes these addresses on x86 systems. Unfortunately some PCI systems now use these addresses for other purposes which leads to users seeing minute plus hangs during boot or even crashes. The following patch (again has been in Fedora for a while) only probes the obscure legacy ISA ports on machinea that are pre-PCI. This seems to keep everyone happy and if there is someone with that utterly weird corner case the ide= command line still provides a get out of jail card. Unsurprisingly we've not found anyone so affected. Signed-off-by: Alan Cox Cc: Bartlomiej Zolnierkiewicz Signed-off-by: Andrew Morton --- include/asm-i386/ide.h | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff -puN include/asm-i386/ide.h~ide-sensible-probing-for-pci-systems include/asm-i386/ide.h --- 25/include/asm-i386/ide.h~ide-sensible-probing-for-pci-systems 2005-06-24 02:34:00.000000000 -0700 +++ 25-akpm/include/asm-i386/ide.h 2005-06-24 02:34:00.000000000 -0700 @@ -41,13 +41,17 @@ static __inline__ int ide_default_irq(un static __inline__ unsigned long ide_default_io_base(int index) { + if (pci_find_device(PCI_ANY_ID, PCI_ANY_ID, NULL) == NULL) { + switch(index) { + case 2: return 0x1e8; + case 3: return 0x168; + case 4: return 0x1e0; + case 5: return 0x160; + } + } switch (index) { case 0: return 0x1f0; case 1: return 0x170; - case 2: return 0x1e8; - case 3: return 0x168; - case 4: return 0x1e0; - case 5: return 0x160; default: return 0; } _