d47d81c0e9
Introduce Kconfig option allowing architectures where sysdev operations used during system suspend, resume and shutdown have been completely replaced with struct sycore_ops operations to avoid building sysdev code that will never be used. Make callbacks in struct sys_device and struct sysdev_driver depend on ARCH_NO_SYSDEV_OPS to allows us to verify if all of the references have been actually removed from the code the given architecture depends on. Make x86 select ARCH_NO_SYSDEV_OPS. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
179 lines
6.9 KiB
Plaintext
179 lines
6.9 KiB
Plaintext
menu "Generic Driver Options"
|
|
|
|
config UEVENT_HELPER_PATH
|
|
string "path to uevent helper"
|
|
depends on HOTPLUG
|
|
default ""
|
|
help
|
|
Path to uevent helper program forked by the kernel for
|
|
every uevent.
|
|
Before the switch to the netlink-based uevent source, this was
|
|
used to hook hotplug scripts into kernel device events. It
|
|
usually pointed to a shell script at /sbin/hotplug.
|
|
This should not be used today, because usual systems create
|
|
many events at bootup or device discovery in a very short time
|
|
frame. One forked process per event can create so many processes
|
|
that it creates a high system load, or on smaller systems
|
|
it is known to create out-of-memory situations during bootup.
|
|
|
|
config DEVTMPFS
|
|
bool "Maintain a devtmpfs filesystem to mount at /dev"
|
|
depends on HOTPLUG
|
|
help
|
|
This creates a tmpfs/ramfs filesystem instance early at bootup.
|
|
In this filesystem, the kernel driver core maintains device
|
|
nodes with their default names and permissions for all
|
|
registered devices with an assigned major/minor number.
|
|
Userspace can modify the filesystem content as needed, add
|
|
symlinks, and apply needed permissions.
|
|
It provides a fully functional /dev directory, where usually
|
|
udev runs on top, managing permissions and adding meaningful
|
|
symlinks.
|
|
In very limited environments, it may provide a sufficient
|
|
functional /dev without any further help. It also allows simple
|
|
rescue systems, and reliably handles dynamic major/minor numbers.
|
|
|
|
Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs
|
|
file system will be used instead.
|
|
|
|
config DEVTMPFS_MOUNT
|
|
bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs"
|
|
depends on DEVTMPFS
|
|
help
|
|
This will instruct the kernel to automatically mount the
|
|
devtmpfs filesystem at /dev, directly after the kernel has
|
|
mounted the root filesystem. The behavior can be overridden
|
|
with the commandline parameter: devtmpfs.mount=0|1.
|
|
This option does not affect initramfs based booting, here
|
|
the devtmpfs filesystem always needs to be mounted manually
|
|
after the roots is mounted.
|
|
With this option enabled, it allows to bring up a system in
|
|
rescue mode with init=/bin/sh, even when the /dev directory
|
|
on the rootfs is completely empty.
|
|
|
|
config STANDALONE
|
|
bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL
|
|
default y
|
|
help
|
|
Select this option if you don't have magic firmware for drivers that
|
|
need it.
|
|
|
|
If unsure, say Y.
|
|
|
|
config PREVENT_FIRMWARE_BUILD
|
|
bool "Prevent firmware from being built"
|
|
default y
|
|
help
|
|
Say yes to avoid building firmware. Firmware is usually shipped
|
|
with the driver, and only when updating the firmware a rebuild
|
|
should be made.
|
|
If unsure say Y here.
|
|
|
|
config FW_LOADER
|
|
tristate "Userspace firmware loading support" if EXPERT
|
|
default y
|
|
---help---
|
|
This option is provided for the case where no in-kernel-tree modules
|
|
require userspace firmware loading support, but a module built outside
|
|
the kernel tree does.
|
|
|
|
config FIRMWARE_IN_KERNEL
|
|
bool "Include in-kernel firmware blobs in kernel binary"
|
|
depends on FW_LOADER
|
|
default y
|
|
help
|
|
The kernel source tree includes a number of firmware 'blobs'
|
|
which are used by various drivers. The recommended way to
|
|
use these is to run "make firmware_install" and to copy the
|
|
resulting binary files created in usr/lib/firmware directory
|
|
of the kernel tree to the /lib/firmware on your system so
|
|
that they can be loaded by userspace helpers on request.
|
|
|
|
Enabling this option will build each required firmware blob
|
|
into the kernel directly, where request_firmware() will find
|
|
them without having to call out to userspace. This may be
|
|
useful if your root file system requires a device which uses
|
|
such firmware, and do not wish to use an initrd.
|
|
|
|
This single option controls the inclusion of firmware for
|
|
every driver which uses request_firmware() and ships its
|
|
firmware in the kernel source tree, to avoid a proliferation
|
|
of 'Include firmware for xxx device' options.
|
|
|
|
Say 'N' and let firmware be loaded from userspace.
|
|
|
|
config EXTRA_FIRMWARE
|
|
string "External firmware blobs to build into the kernel binary"
|
|
depends on FW_LOADER
|
|
help
|
|
This option allows firmware to be built into the kernel, for the
|
|
cases where the user either cannot or doesn't want to provide it from
|
|
userspace at runtime (for example, when the firmware in question is
|
|
required for accessing the boot device, and the user doesn't want to
|
|
use an initrd).
|
|
|
|
This option is a string, and takes the (space-separated) names of the
|
|
firmware files -- the same names which appear in MODULE_FIRMWARE()
|
|
and request_firmware() in the source. These files should exist under
|
|
the directory specified by the EXTRA_FIRMWARE_DIR option, which is
|
|
by default the firmware/ subdirectory of the kernel source tree.
|
|
|
|
So, for example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin",
|
|
copy the usb8388.bin file into the firmware/ directory, and build the
|
|
kernel. Then any request_firmware("usb8388.bin") will be
|
|
satisfied internally without needing to call out to userspace.
|
|
|
|
WARNING: If you include additional firmware files into your binary
|
|
kernel image which are not available under the terms of the GPL,
|
|
then it may be a violation of the GPL to distribute the resulting
|
|
image -- since it combines both GPL and non-GPL work. You should
|
|
consult a lawyer of your own before distributing such an image.
|
|
|
|
config EXTRA_FIRMWARE_DIR
|
|
string "Firmware blobs root directory"
|
|
depends on EXTRA_FIRMWARE != ""
|
|
default "firmware"
|
|
help
|
|
This option controls the directory in which the kernel build system
|
|
looks for the firmware files listed in the EXTRA_FIRMWARE option.
|
|
The default is the firmware/ directory in the kernel source tree,
|
|
but by changing this option you can point it elsewhere, such as
|
|
the /lib/firmware/ directory or another separate directory
|
|
containing firmware files.
|
|
|
|
config DEBUG_DRIVER
|
|
bool "Driver Core verbose debug messages"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here if you want the Driver core to produce a bunch of
|
|
debug messages to the system log. Select this if you are having a
|
|
problem with the driver core and want to see more of what is
|
|
going on.
|
|
|
|
If you are unsure about this, say N here.
|
|
|
|
config DEBUG_DEVRES
|
|
bool "Managed device resources verbose debug messages"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
This option enables kernel parameter devres.log. If set to
|
|
non-zero, devres debug messages are printed. Select this if
|
|
you are having a problem with devres or want to debug
|
|
resource management for a managed device. devres.log can be
|
|
switched on and off from sysfs node.
|
|
|
|
If you are unsure about this, Say N here.
|
|
|
|
config SYS_HYPERVISOR
|
|
bool
|
|
default n
|
|
|
|
config ARCH_NO_SYSDEV_OPS
|
|
bool
|
|
---help---
|
|
To be selected by architectures that don't use sysdev class or
|
|
sysdev driver power management (suspend/resume) and shutdown
|
|
operations.
|
|
|
|
endmenu
|