• Bartlomiej Zolnierkiewicz's avatar
    ide: preserve Host Protected Area by default (v2) · 075affcb
    Bartlomiej Zolnierkiewicz authored
    From the perspective of most users of recent systems, disabling Host
    Protected Area (HPA) can break vendor RAID formats, GPT partitions and
    risks corrupting firmware or overwriting vendor system recovery tools.
    Unfortunately the original (kernels < 2.6.30) behavior (unconditionally
    disabling HPA and using full disk capacity) was introduced at the time
    when the main use of HPA was to make the drive look small enough for the
    BIOS to allow the system to boot with large capacity drives.
    Thus to allow the maximum compatibility with the existing setups (using
    HPA and partitioned with HPA disabled) we automically disable HPA if
    any partitions overlapping HPA are detected.  Additionally HPA can also
    be disabled using the "nohpa" module parameter (i.e. "ide_core.nohpa=0.0"
    to disable HPA on /dev/hda).
    Fix ->resume HPA support.
    While at it:
    - remove stale "idebus=" entry from Documentation/kernel-parameters.txt
    Cc: Robert Hancock <hancockrwd@gmail.com>
    Cc: Frans Pop <elendil@planet.nl>
    Cc: "Andries E. Brouwer" <Andries.Brouwer@cwi.nl>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Acked-by: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
    [patch description was based on input from Alan Cox and Frans Pop]
    Emphatically-Acked-by: default avatarAlan Cox <alan@linux.intel.com>
    Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
ide.c 10.4 KB