config SCSI_AHA152X
tristate "Adaptec AHA152X/2825 support"
- depends on ISA && SCSI
+ depends on ISA && SCSI && !64BIT
---help---
This is a driver for the AHA-1510, AHA-1520, AHA-1522, and AHA-2825
SCSI host adapters. It also works for the AVA-1505, but the IRQ etc.
depends on SCSI_SYM53C8XX_2
default "1"
---help---
- This option only applies to PCI-SCSI chip that are PCI DAC capable
- (875A, 895A, 896, 1010-33, 1010-66, 1000).
-
- When set to 0, only PCI 32 bit DMA addressing (SAC) will be performed.
- When set to 1, 40 bit DMA addressing (with upper 24 bits of address
- set to zero) is supported. The addressable range is here 1 TB.
- When set to 2, full 64 bits of address for DMA are supported, but only
- 16 segments of 4 GB can be addressed. The addressable range is so
- limited to 64 GB.
+ This option only applies to PCI-SCSI chips that are PCI DAC
+ capable (875A, 895A, 896, 1010-33, 1010-66, 1000).
- The safest value is 0 (32 bit DMA addressing) that is guessed to still
- fit most of real machines.
+ When set to 0, the driver will program the chip to only perform
+ 32-bit DMA. When set to 1, the chip will be able to perform DMA
+ to addresses up to 1TB. When set to 2, the driver supports the
+ full 64-bit DMA address range, but can only address 16 segments
+ of 4 GB each. This limits the total addressable range to 64 GB.
- The preferred value 1 (40 bit DMA addressing) should make happy
- properly engineered PCI DAC capable host bridges. You may configure
- this option for Intel platforms with more than 4 GB of memory.
+ Most machines with less than 4GB of memory should use a setting
+ of 0 for best performance. If your machine has 4GB of memory
+ or more, you should set this option to 1 (the default).
- The still experimental value 2 (64 bit DMA addressing with 16 x 4GB
- segments limitation) can be used on systems that require PCI address
- bits past bit 39 to be set for the addressing of memory using PCI
- DAC cycles.
+ The still experimental value 2 (64 bit DMA addressing with 16
+ x 4GB segments limitation) can be used on systems that require
+ PCI address bits past bit 39 to be set for the addressing of
+ memory using PCI DAC cycles.
config SCSI_SYM53C8XX_DEFAULT_TAGS
int "default tagged command queue depth"
depends on SCSI_SYM53C8XX_2
default "16"
help
- This is the default value of the command queue depth the driver will
- announce to the generic SCSI layer for devices that support tagged
- command queueing. This value can be changed from the boot command line.
- This is a soft limit that cannot exceed CONFIG_SCSI_SYM53C8XX_MAX_TAGS.
+ This is the default value of the command queue depth the
+ driver will announce to the generic SCSI layer for devices
+ that support tagged command queueing. This value can be changed
+ from the boot command line. This is a soft limit that cannot
+ exceed CONFIG_SCSI_SYM53C8XX_MAX_TAGS.
config SCSI_SYM53C8XX_MAX_TAGS
int "maximum number of queued commands"
This value is used as a compiled-in hard limit.
config SCSI_SYM53C8XX_IOMAPPED
- bool "use normal IO"
+ bool "use port IO"
depends on SCSI_SYM53C8XX_2
help
- If you say Y here, the driver will preferently use normal IO rather than
- memory mapped IO.
+ If you say Y here, the driver will use port IO to access
+ the card. This is significantly slower then using memory
+ mapped IO. Most people should answer N.
config SCSI_ZALON
tristate "Zalon SCSI support"
config SCSI_DC390T
tristate "Tekram DC390(T) and Am53/79C974 SCSI support"
- depends on PCI && SCSI && BROKEN
+ depends on PCI && SCSI
---help---
This driver supports PCI SCSI host adapters based on the Am53C974A
chip, e.g. Tekram DC390(T), DawiControl 2974 and some onboard
projects / linux-flexiantxendom0-3.2.10.git / blobdiff