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
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
gio(4),
imc(4),
pic(4)
HISTORY
The
hpc
driver first appeared in
NetBSD1.6
with support for Revision 3.
Revision 1 and 1.5 support was added in
NetBSD2.0.
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.