MAGMA(4) | Device Drivers Manual (sparc) | MAGMA(4) |
magma
—
magma* at sbus? slot ? offset ?
mtty* at magma?
mbpp* at magma?
magma
driver provides an interface to Magma LC2+1Sp,
2+1Sp, 4+1Sp, 8+2Sp, 4Sp, 8Sp, 12Sp, 16Sp, 1P and 2P boards. These boards are
based around the Cirrus Logic CD1400 serial/parallel communications engine and
the Cirrus Logic CD1190 parallel communications engine.
The device minor numbers for this driver are encoded as follows:
+---+---+---+---+---+---+---+---+ | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | +---+---+---+---+---+---+---+---+ | | | | | | | | | | | | +---+---+---+---> port number | | | | | | | +-------------------> dial-out (on tty ports) | | | | | +-----------------------> unused | | +---+---------------------------> card number
Up to four cards are supported in the system.
All tty ports have full automatic hardware (RTS/CTS) flow control available and a 12 byte FIFO on the chip in each direction so errors should be minimal.
If need be you can make the ring buffer bigger by changing the
MAGMA_RBUF_SIZE
#define to something bigger, but
it should be a multiple of two.
Reducing the value of either the
MTTY_RX_FIFO_THRESHOLD
or
MTTY_RX_DTR_THRESHOLD
#define's to something
smaller may help slow machines avoid this problem.
“bpp” input.
Dial-out (cua) devices are not yet supported.
“mdmbuf” is unsupported (see tty(4) and termios(4)).
Automatic XON/XOFF handshaking could be implemented fairly easily.
It would be good if the tty port waited for the FIFO to empty before allowing a close, so that I could turn off the channel interrupts at that time. It can be done.
April 21, 1998 | NetBSD 9.4 |