• Helge Deller's avatar
    parisc: Disable HP HSC-PCI Cards to prevent kernel crash · 5fa16591
    Helge Deller authored
    The HP Dino PCI controller chip can be used in two variants: as on-board
    controller (e.g. in B160L), or on an Add-On card ("Card-Mode") to bridge
    PCI components to systems without a PCI bus, e.g. to a HSC/GSC bus.  One
    such Add-On card is the HP HSC-PCI Card which has one or more DEC Tulip
    PCI NIC chips connected to the on-card Dino PCI controller.
    
    Dino in Card-Mode has a big disadvantage: All PCI memory accesses need
    to go through the DINO_MEM_DATA register, so Linux drivers will not be
    able to use the ioremap() function. Without ioremap() many drivers will
    not work, one example is the tulip driver which then simply crashes the
    kernel if it tries to access the ports on the HP HSC card.
    
    This patch disables the HP HSC card if it finds one, and as such
    fixes the kernel crash on a HP D350/2 machine.
    Signed-off-by: default avatarHelge Deller <deller@gmx.de>
    Noticed-by: default avatarPhil Scarr <phil.scarr@pm.me>
    Cc: stable@vger.kernel.org
    5fa16591
dino.c 31 KB