IMCSMB(4) | Device Drivers Manual | IMCSMB(4) |
imcsmb
—
imc* at pci? dev
?
func
?
imcsmb* at imc?
iic* at i2cbus?
Alternatively, to load the driver as a module at boot time, place the following line in boot.cfg(5):
load=imcsmb
or add the following line to your /etc/modules file:
imcsmb
imcsmb
driver provides
iic(4) support for the SMBus
controller functionality in the integrated Memory Controllers (iMCs) embedded
in Intel Sandybridge-Xeon, Ivybridge-Xeon, Haswell-Xeon, and Broadwell-Xeon
CPUs. Each CPU implements one or more iMCs, depending on the number of cores;
each iMC implements two SMBus controllers (iMC-SMBs). The iMC-SMBs are used by
the iMCs to read configuration information from the DIMMs during POST. They
may also be used, by motherboard firmware or a BMC, to monitor the temperature
of the DIMMs.
The iMC-SMBs are not general-purpose SMBus controllers. By their nature, they are only ever attached to DIMMs, so they implement only the SMBus operations needed for communicating with DIMMs. Specifically:
A more detailed discussion of the hardware and driver architecture can be found at the top of sys/dev/imcsmb/imc.c.
DIMM temperature monitoring should be disabled before returning
from imcsmb_pci_request_bus
(), and re-enabled before
returning from imcsmb_pci_release_bus
(). The driver
includes comments to that effect at the appropriate locations. The driver
has been tested and shown to work, with only that type of modification, on
certain motherboards from Intel. (Unfortunately, those modifications were
based on material covered under a non-disclosure agreement, and therefore
are not included in this driver.) The driver has also been tested and shown
to work as-is on various motherboards from SuperMicro and ASUS.
Because of the above, the imcsmb
driver is
not included in the default GENERIC
kernel. In order
to use the imcsmb
driver, you must compile a custom
kernel, or load the driver using
modload(8).
The iic(4) driver
will connect to the i2cbus instances created by
imcsmb
.
imcsmb
driver first appeared in
FreeBSD 12.0. It was later ported to
NetBSD 9.0.
imcsmb
driver was originally written for Panasas by
Joe Kloss. It was substantially refactored, and this
manual page was written, by Ravi Pokala
<rpokala@freebsd.org>.
It was adapted to NetBSD by Paul
Goyette
<pgoyette@NetBSD.org>.
February 28, 2018 | NetBSD 9.4 |