path: root/Documentation/ide
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authorBartlomiej Zolnierkiewicz <>2009-06-07 13:52:52 +0200
committerBartlomiej Zolnierkiewicz <>2009-06-07 13:52:52 +0200
commit075affcbe01d4d7cefcd0e30a98df1253bcf8d92 (patch)
treeceadcf00f56c5a7a394e689e61734811efe33b82 /Documentation/ide
parente957b60d1583022a0f7c03267d37fcae2ddb78b1 (diff)
ide: preserve Host Protected Area by default (v2)
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). v2: Fix ->resume HPA support. While at it: - remove stale "idebus=" entry from Documentation/kernel-parameters.txt Cc: Robert Hancock <> Cc: Frans Pop <> Cc: "Andries E. Brouwer" <> Cc: Al Viro <> Acked-by: Sergei Shtylyov <> [patch description was based on input from Alan Cox and Frans Pop] Emphatically-Acked-by: Alan Cox <> Signed-off-by: Bartlomiej Zolnierkiewicz <>
Diffstat (limited to 'Documentation/ide')
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/ide/ide.txt b/Documentation/ide/ide.txt
index 0c78f4b1d9d9..e77bebfa7b0d 100644
--- a/Documentation/ide/ide.txt
+++ b/Documentation/ide/ide.txt
@@ -216,6 +216,8 @@ Other kernel parameters for ide_core are:
* "noflush=[interface_number.device_number]" to disable flush requests
+* "nohpa=[interface_number.device_number]" to disable Host Protected Area
* "noprobe=[interface_number.device_number]" to skip probing
* "nowerr=[interface_number.device_number]" to ignore the WRERR_STAT bit