patch-2.1.15 linux/drivers/char/README.esp

• Lines: 95
• Date: Wed Dec 11 17:16:07 1996
• Orig file: v2.1.14/linux/drivers/char/README.esp
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.14/linux/drivers/char/README.esp linux/drivers/char/README.esp
@@ -0,0 +1,94 @@
+HAYES ESP DRIVERS VERSION 1.0
+
+Features:
+
+- Uses the enhanced mode of the ESP card, allowing a wider range of
+  interrupts and features than compatibilty mode
+- Uses DMA to transfer data to and from the ESP's FIFOs, reducing CPU load
+- Supports primary and secondary ports
+
+The driver can be compiled as a module.  The module will be called 'esp.o'.
+The IRQs to use can be specified by using the irq= option.  The format is:
+
+irq=[0x100],[0x140],[0x180],[0x200],[0x240],[0x280],[0x300],[0x380]
+
+The address in brackets is the base address of the card.  The IRQ of
+nonexistant cards can be set to 0.  If and IRQ of a card that does exist is set
+to 0, the driver will attempt to guess at the correct IRQ.  For example, to set
+the IRQ of the card at address 0x300 to 12, the insmod command would be:
+
+insmod esp irq=0,0,0,0,0,0,12,0
+
+The custom divisor can be set by using the divisor= option.  The format is the
+same as for the irq= option.  Each divisor value is a series of hex digits,
+with each digit representing the divisor to use for a corresponding port.  The
+divisor value is constructed RIGHT TO LEFT.  Specifying a nonzero divisor value
+will automatically set the spd_cust flag.  To calculate the divisor to use for
+a certain baud rate, divide the port's base baud (921600) by the desired rate.
+For example, to set the divisor of the primary port at 0x300 to 4 and the
+divisor of the secondary port at 0x308 to 8, the insmod command would be:
+
+insmod esp divisor=0,0,0,0,0,0,0x84,0
+
+The dma= option can be used to set the DMA channel.  The channel can be either
+1 or 3.  For example, to set the dma channel to 3, the insmod command would be:
+
+insmod esp dma=3
+
+The trigger= option can be used to set the FIFO trigger levels.  This specifies
+when the ESP card should send an interrupt.  Larger values will decrease the
+number of interrupts; however, a value too high may result in data loss.
+Valid values are 1 through 1015, with 768 being the default.  For example, to
+set the trigger levels to 512 bytes, the insmod command would be:
+
+insmod esp trigger=512
+
+Multiple options can be listed on the insmod command line by separating each
+option with a space.  For example:
+
+insmod esp dma=3 trigger=512
+
+The esp module can be automatically loaded when needed.  To cause this to
+happen, add the following lines to /etc/conf.modules (replacing the last line
+with options for your configuration):
+
+alias char-major-57 esp
+alias char-major-58 esp
+options esp irq=0,0,0,0,0,0,3,0 divisor=0,0,0,0,0,0,0x4,0
+
+You may also need to run 'depmod -a'.
+
+Devices must be created manually.  To create the devices, note the output from
+the module after it is inserted.  The output will appear in the location where
+kernel messages usually appear (usually /var/adm/messages).  Create two devices
+for each 'tty' mentioned, one with major of 57 and the other with major of 58.
+The minor number should be the same as the tty number reported.  The commands
+would be (replace ? with the tty number):
+
+mknod /dev/ttyP? c 57 ?
+mknod /dev/cup? c 58 ?
+
+For example, if the following line appears:
+
+Oct 24 18:17:23 techno kernel: ttyP8 at 0x0140 (irq = 3) is an ESP primary port
+
+...two devices should be created:
+
+mknod /dev/ttyP8 c 57 8
+mknod /dev/cup8 c 58 8
+
+You may need to set the permissions on the devices:
+
+chmod 666 /dev/ttyP*
+chmod 666 /dev/cup*
+
+The ESP module and the serial module should not conflict (they can be used at
+the same time).  After the ESP module has been loaded the ports on the ESP card
+will no longer be accessable by the serial driver.
+
+If I/O errors are experienced when accessing the port, check for IRQ and DMA
+conflicts ('cat /proc/interrupts' and 'cat /proc/dma' for a list of IRQs and
+DMAs currently in use).
+
+Enjoy!
+Andrew J. Robinson <arobinso@nyx.net>