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authorTejun Heo <tj@kernel.org>2008-09-27 19:32:17 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-09-27 19:32:17 +0200
commit278ecfb8f4100c0edc2bc77695b591ea16388829 (patch)
tree737a0e0fcad40d9f6223efddbf6f2f553e9fe691
parent801bd32e205ca6ef78dcaf80121f1eccb89b8c1e (diff)
ide: note that IDE generic may prevent other drivers from attaching
Enabling IDE generic may prevent ATA controllers located on legacy ports from being attached to more proper driver or can prevent other controllers which share the IRQ from working. Note it in the help message. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: xerces8 <xerces8@butn.net> Cc: Jeff Garzik <jgarzik@pobox.com> Cc: stein@hermes.si [bart: s/will grab/may grab/ since Borislav has fixed PCI-case for .28] Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
-rw-r--r--drivers/ide/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index fc735ab08ff4..8e93a797c93d 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -292,6 +292,20 @@ config IDE_GENERIC
tristate "generic/default IDE chipset support"
depends on ALPHA || X86 || IA64 || M32R || MIPS
help
+ This is the generic IDE driver. This driver attaches to the
+ fixed legacy ports (e.g. on PCs 0x1f0/0x170, 0x1e8/0x168 and
+ so on). Please note that if this driver is built into the
+ kernel or loaded before other ATA (IDE or libata) drivers
+ and the controller is located at legacy ports, this driver
+ may grab those ports and thus can prevent the controller
+ specific driver from attaching.
+
+ Also, currently, IDE generic doesn't allow IRQ sharing
+ meaning that the IRQs it grabs won't be available to other
+ controllers sharing those IRQs which usually makes drivers
+ for those controllers fail. Generally, it's not a good idea
+ to load IDE generic driver on modern systems.
+
If unsure, say N.
config BLK_DEV_PLATFORM