[syslinux] isolinux serial console keyboard issue

H. Peter Anvin hpa at zytor.com
Fri Jan 16 01:27:05 PST 2004


Floriola wrote:
> 
> Do you have any clue why in the syslinux docu there is
> no word about the "serial" flow control option?
> 

This is what's in syslinux.doc:

SERIAL port [[baudrate] flowcontrol]
         Enables a serial port to act as the console.  "port" is a
         number (0 = /dev/ttyS0 = COM1, etc.) or an I/O port address
         (e.g. 0x3F8); if "baudrate" is omitted, the baud rate defaults
         to 9600 bps.  The serial parameters are hardcoded to be 8
         bits, no parity, 1 stop bit.

         "flowcontrol" is a combination of the following bits:
         0x001 - Assert DTR
         0x002 - Assert RTS
         0x010 - Wait for CTS assertion
         0x020 - Wait for DSR assertion
         0x040 - Wait for RI assertion
         0x080 - Wait for DCD assertion
         0x100 - Ignore input unless CTS asserted
         0x200 - Ignore input unless DSR asserted
         0x400 - Ignore input unless RI asserted
         0x800 - Ignore input unless DCD asserted

         All other bits are reserved.

         Typical values are:

             0 - No flow control (default)
         0x303 - Null modem cable detect
         0x013 - RTS/CTS flow control
         0x813 - RTS/CTS flow control, modem input
         0x023 - DTR/DSR flow control
         0x083 - DTR/DCD flow control

         For the SERIAL directive to be guaranteed to work properly, it
         should be the first directive in the configuration file.

         NOTE: "port" values from 0 to 3 means the first four serial
         ports detected by the BIOS.  They may or may not correspond to
         the legacy port values 0x3F8, 0x2F8, 0x3E8, 0x2E8.




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