HPC(4) | Device Drivers Manual (sgimips) | HPC(4) |
hpc
— SGI High
performance Peripheral Controller
hpc0 at gio0 addr 0x1fb80000
hpc1 at gio0 addr 0x1fb00000
hpc2 at gio0 addr 0x1fb98000
hpc3 at gio0 addr 0x1fb90000
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.
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.
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.
February 17, 2017 | NetBSD 10.99 |