forked from Minki/linux
9361401eb7
Make it possible to disable the block layer. Not all embedded devices require it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require the block layer to be present. This patch does the following: (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev support. (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls an item that uses the block layer. This includes: (*) Block I/O tracing. (*) Disk partition code. (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS. (*) The SCSI layer. As far as I can tell, even SCSI chardevs use the block layer to do scheduling. Some drivers that use SCSI facilities - such as USB storage - end up disabled indirectly from this. (*) Various block-based device drivers, such as IDE and the old CDROM drivers. (*) MTD blockdev handling and FTL. (*) JFFS - which uses set_bdev_super(), something it could avoid doing by taking a leaf out of JFFS2's book. (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is, however, still used in places, and so is still available. (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and parts of linux/fs.h. (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK. (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK. (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK is not enabled. (*) fs/no-block.c is created to hold out-of-line stubs and things that are required when CONFIG_BLOCK is not set: (*) Default blockdev file operations (to give error ENODEV on opening). (*) Makes some /proc changes: (*) /proc/devices does not list any blockdevs. (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK. (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK. (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if given command other than Q_SYNC or if a special device is specified. (*) In init/do_mounts.c, no reference is made to the blockdev routines if CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2. (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return error ENOSYS by way of cond_syscall if so). (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if CONFIG_BLOCK is not set, since they can't then happen. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
113 lines
3.1 KiB
Plaintext
113 lines
3.1 KiB
Plaintext
#
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# MMC subsystem configuration
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#
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menu "MMC/SD Card support"
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config MMC
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tristate "MMC support"
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help
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MMC is the "multi-media card" bus protocol.
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If you want MMC support, you should say Y here and also
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to the specific driver for your MMC interface.
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config MMC_DEBUG
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bool "MMC debugging"
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depends on MMC != n
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help
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This is an option for use by developers; most people should
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say N here. This enables MMC core and driver debugging.
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config MMC_BLOCK
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tristate "MMC block device driver"
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depends on MMC && BLOCK
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default y
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help
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Say Y here to enable the MMC block device driver support.
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This provides a block device driver, which you can use to
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mount the filesystem. Almost everyone wishing MMC support
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should say Y or M here.
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config MMC_ARMMMCI
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tristate "ARM AMBA Multimedia Card Interface support"
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depends on ARM_AMBA && MMC
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help
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This selects the ARM(R) AMBA(R) PrimeCell Multimedia Card
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Interface (PL180 and PL181) support. If you have an ARM(R)
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platform with a Multimedia Card slot, say Y or M here.
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If unsure, say N.
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config MMC_PXA
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tristate "Intel PXA255 Multimedia Card Interface support"
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depends on ARCH_PXA && MMC
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help
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This selects the Intel(R) PXA(R) Multimedia card Interface.
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If you have a PXA(R) platform with a Multimedia Card slot,
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say Y or M here.
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If unsure, say N.
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config MMC_SDHCI
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tristate "Secure Digital Host Controller Interface support (EXPERIMENTAL)"
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depends on PCI && MMC && EXPERIMENTAL
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help
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This select the generic Secure Digital Host Controller Interface.
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It is used by manufacturers such as Texas Instruments(R), Ricoh(R)
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and Toshiba(R). Most controllers found in laptops are of this type.
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If you have a controller with this interface, say Y or M here.
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If unsure, say N.
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config MMC_OMAP
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tristate "TI OMAP Multimedia Card Interface support"
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depends on ARCH_OMAP && MMC
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select TPS65010 if MACH_OMAP_H2
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help
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This selects the TI OMAP Multimedia card Interface.
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If you have an OMAP board with a Multimedia Card slot,
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say Y or M here.
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If unsure, say N.
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config MMC_WBSD
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tristate "Winbond W83L51xD SD/MMC Card Interface support"
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depends on MMC && ISA_DMA_API
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help
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This selects the Winbond(R) W83L51xD Secure digital and
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Multimedia card Interface.
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If you have a machine with a integrated W83L518D or W83L519D
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SD/MMC card reader, say Y or M here.
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If unsure, say N.
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config MMC_AU1X
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tristate "Alchemy AU1XX0 MMC Card Interface support"
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depends on MMC && SOC_AU1200
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help
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This selects the AMD Alchemy(R) Multimedia card interface.
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If you have a Alchemy platform with a MMC slot, say Y or M here.
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If unsure, say N.
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config MMC_AT91RM9200
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tristate "AT91RM9200 SD/MMC Card Interface support"
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depends on ARCH_AT91RM9200 && MMC
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help
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This selects the AT91RM9200 MCI controller.
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If unsure, say N.
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config MMC_IMX
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tristate "Motorola i.MX Multimedia Card Interface support"
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depends on ARCH_IMX && MMC
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help
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This selects the Motorola i.MX Multimedia card Interface.
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If you have a i.MX platform with a Multimedia Card slot,
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say Y or M here.
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If unsure, say N.
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endmenu
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