MCCLOCK(4) BSD Kernel Interfaces Manual MCCLOCK(4)NAME
mcclock -- DS1287 real-time clock
SYNOPSIS
algor
mcclock* at isa? port 0x70
alpha
mcclock* at gbus? offset ?
mcclock* at ioasic? offset ?
mcclock* at isa? port 0x70
mcclock* at jensenio? port ?
arc
mcclock* at jazzio?
evbmips
mcclock* at isa? port 0x70
pmax
mcclock* at ibus0 addr ?
mcclock* at ioasic? offset ?
sgimips
mcclock* at mace0 offset 0x3a0000
DESCRIPTION
The mcclock driver provides support for the DS1287 real-time clock (RTC). Note that the kernel expects the RTC to run in UTC.
SEE ALSO intro(4), ioasic(4), isa(4)BSD September 18, 2001 BSD
Check Out this Related Man Page
IOASIC(4) BSD Kernel Interfaces Manual IOASIC(4)NAME
ioasic -- baseboard IO control ASIC for DEC TURBOchannel systems
SYNOPSIS
ioasic0 at tc? slot ? offset ?
DESCRIPTION
The ioasic driver provides support for the DEC proprietary IOCTL ASIC found on all DEC TURBOchannel machines with MIPS (DECstation 5000
series, excluding the 5000/200) and Alpha (3000-series) processors. On these machines (including the 5000/200), all baseboard devices should
be configured as children of the ioasic device.
The ioasic provides hardware DMA channels and interrupt support for several baseboard devices, including one asc SCSI device with a scat-
ter/gather DMA channel, an mc146818-compatible mcclock, an Am7930 audio device bba, one or two scc two-port serial devices, and a AMD 7990
LANCE le Ethernet interface.
The ioasic is also used for the floppy-disc drive and audio/ISDN hardware on the Personal DECstation and audio-equipped TURBOchannel Alphas,
where the ioasic hardware provides a scatter-gather DMA channel between the 16-bit device and the 32-bit tc DMA address space.
Support for scatter-gather DMA eliminates the need for additional copying. A baseboard asc SCSI adaptor attached to an ioasic will give
slightly better performance than its tc counterpart.
SEE ALSO asc(4), bba(4), intro(4), le(4), mcclock(4), scc(4), tc(4)HISTORY
The ioasic driver first appeared in NetBSD 1.1, derived from DECstation boot-time configuration code in 4.4BSD.
BUGS
The DECstation 5000/200 does not actually have an IOASIC chip, but for consistency it must be configured as if it did.
BSD September 12, 1996 BSD
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