NAME
hpc —
SGI High performance Peripheral
Controller
SYNOPSIS
hpc0 at gio0 addr 0x1fb80000
hpc1 at gio0 addr 0x1fb00000
hpc2 at gio0 addr 0x1fb98000
hpc3 at gio0 addr 0x1fb90000
DESCRIPTION
hpc interfaces the peripherals connected to it to the
sgimips/gio(4) bus.
hpc is found on the Personal Iris 4D/3x, Indigo, Indy,
Challenge S, Challenge M, and Indigo2 machines.
There are three different numerical revisions of the
hpc
controller. Revisions 1 and 1.5 exist on Personal Iris 4D/3x and Indigo
machines, as well as GIO32bis expansion cards such as the E++ SEEQ-based
Ethernet adapter. Revision 1.5 supports bi-endian operation. Revision 3 exists
on Indy, Challenge S, Indigo2, and Challenge M systems. It is possible to have
an on-board HPC3 as well as HPC1.5-based GIO32bis adapters in the Indy and
Challenge S systems. Additionally, the Challenge S may have a secondary HPC3
if the IOPLUS (a.k.a. ''mezzanine'') board is installed.
HARDWARE
-
-
- dsclock
- DS1286-based RTC
-
-
- dpclock
- DP8573A-based RTC
-
-
- haltwo
- HAL2 audio controller
-
-
- sq
- Seeq 8003 and 80C03 Ethernet controllers
-
-
- wdsc
- WD33c93 SCSI controller
-
-
- zsc
- Zilog Z8530 UART
SEE ALSO
sgimips/gio(4),
sgimips/imc(4),
sgimips/pic(4)
HISTORY
The
hpc driver first appeared in
NetBSD
1.6 with support for Revision 3. Revision 1 and 1.5 support was added
in
NetBSD 2.0.
BUGS
hpc Revisions 1 and 1.5 support DMA buffer pointers of only 28
bits and may therefore only address 256 megabytes of memory. The R4k Indigo
and Indy are the only systems that support sufficient memory to illustrate
this drawback. A software workaround is not currently implemented. Revision 3,
with 32 bit pointers, does not have this limitation.