SPDMEM(4) BSD Kernel Interfaces Manual SPDMEM(4)NAME
spdmem -- Generic Memory Module Serial Presence Detect
SYNOPSIS
spdmem* at iic? addr 0x50
spdmem* at iic? addr 0x51
spdmem* at iic? addr 0x52
spdmem* at iic? addr 0x53
DESCRIPTION
The spdmem driver provides support for generic memory module Serial Presence Detect. During kernel boot it displays module type, and where
possible, the size and rated speed of the memory module. Additional information such as bank configuration and width is printed if the ker-
nel is booted in verbose mode.
The Serial Presence Detect data for each memory module is also made accessible to user mode via sysctl(8). An entry for each spdmem device
is created under the hw top-level MIB.
SEE ALSO iic(4), intro(4)HISTORY
The spdmem driver first appeared in NetBSD 5.0.
AUTHORS
The spdmem driver was written by Nicolas Joly <njoly@pasteur.fr> with additional work by Paul Goyette <paul@whooppee.com>.
BSD August 10, 2007 BSD
Check Out this Related Man Page
ACPISMBUS(4) BSD Kernel Interfaces Manual ACPISMBUS(4)NAME
acpismbus -- ACPI SMBus Control Method Interface
SYNOPSIS
acpismbus* at acpi?
iic* at acpismbus?
DESCRIPTION
The acpismbus driver supports instances of the ACPI SMBus Control Method Interface. This enables i2c access to bus segments which might not
otherwise be accessible due to missing "native" driver support. The SMBus Process Call protocol is not supported. All other SMBus protocols
are supported to the extent that the underlying controller supports them.
SEE ALSO acpi(4), iic(4)HISTORY
The acpismbus driver appeared in NetBSD 6.0.
BUGS
Although acpismbus SMBus Alerts can be associated with individual devices, this capability is ignored. When an acpismbus SMBus Alert is gen-
erated, all devices on the i2c bus segment which have registered an interrupt routine are notified.
The SMBus CMI protocol defines a method to provide a list of devices on an i2c bus segment and their addresses. The acpismbus driver makes
no attempt to retrieve or process this device list.
There is currently no way to determine if the i2c controller managed by an instance of the ACPI SMBus CMI can also be accessed using a native
device driver. Therefore, the acpismbus driver should not be enabled by default. If both a native driver and the acpismbus driver attempt
to access the same i2c bus segment, the results are undefined.
BSD February 6, 2010 BSD
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