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AIX
Help needed with AIX 6.1
Post 302336216 by shockneck on Tuesday 21st of July 2009 02:18:49 PM
07-21-2009
Quote:
[...]The handshaking used in single user mode, a diagnostic boot, and the early part of a normal boot differs from the handshaking when AIX takes over and configures the tty in multi user mode before it issues the login prompt.
Before AIX takes over the port and configures the TTY the system uses hardware flow control, but the default for AIX is software flow control and this is where the extra wires, often not found in a normal null modem cable, come into play.
So if your cable is not wired correctly for an AIX system, i.e. it is a "standard" rs232 null modem cable or a "laplink" cable then you are likely to have this problem of seeing everything OK in single user, diagnostic, and the first part of the multi user boot but you will not see the login prompt prompt in a multi user boot.
Before AIX takes over the port and configures the TTY the system uses hardware flow control, but the default for AIX is software flow control and this is where the extra wires, often not found in a normal null modem cable, come into play.
So if your cable is not wired correctly for an AIX system, i.e. it is a "standard" rs232 null modem cable or a "laplink" cable then you are likely to have this problem of seeing everything OK in single user, diagnostic, and the first part of the multi user boot but you will not see the login prompt prompt in a multi user boot.
So configuring clocal makes it much easier finding a suitable cable. It does not have to be an 'original' one.Btw the number of wires in those cables is highly overestimated IMHO. An AIX tty can be controlled with just two wires (if I let aside shielding) for send and receive when flow control is set to none.
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LEARN ABOUT NETBSD
cz
CZ(4) BSD Kernel Interfaces Manual CZ(4) NAME
cz -- Cyclades-Z series multi-port serial adapter device driver SYNOPSIS
cz* at pci? dev ? function ? DESCRIPTION
The cz device driver supports the Cyclades-Z series of multi-port serial adapters. The Cyclades-Z is an intelligent serial controller com- prising: o PLX9060ES PCI bus interface o Xilinx XC5204 FPGA o IDT R3052 MIPS CPU The MIPS CPU runs firmware provided by the device driver. Communication with the MIPS is performed by modifying data structures located in board local RAM or host RAM. The Cyclades-Z comes in three basic flavors: o Cyclades-8Zo rev. 1 -- This is an older 8-port board with no FPGA. The serial ports are provided by an octopus cable. o Cyclades-8Zo rev. 2 -- This is the newer 8-port board. The serial ports are provided by an octopus cable. o Cyclades-Ze -- This is the expandable version of the Cyclades-Z. It uses an HD-50 SCSI cable to connect the board to a 1U rack mountable serial expansion box. Each box has 16 RJ45 serial ports, and up to 4 boxes may be chained together, for a total of 64 ports. Boxes 3 and 4 require their own external power supply, otherwise the firmware will refuse to start (as it cannot communi- cate with the UARTs in those boxes). The Cyclades-Z has several features to improve performance under high serial I/O load: o The board may operate in interrupt-driven mode or polled mode to reduce interrupt load. o Each channel has a large input and output buffer. o Each channel may be programmed to generate an interrupt based on reception of a specific character, e.g. a PPP End-Of-Frame charac- ter. o The MIPS CPU on the board performs all flow-control handling. FILES
/dev/ttyCZnnnn -- dial-in (normal) TTY device /dev/dtyCZnnnn -- dial-out TTY device SEE ALSO
pci(4), termios(4), tty(4) HISTORY
The cz driver first appeared in NetBSD 1.5. AUTHORS
The cz driver was written by Jason R. Thorpe <thorpej@zembu.com> and Bill Studenmund <wrstuden@zembu.com> of Zembu Labs, Inc. BUGS
The cz driver does not currently implement communication via host RAM. While this may improve performance by reducing the number of PCI mem- ory space read/write cycles, it is not straightforward to implement with the current bus_dma(9) API. Interrupt mode has not been tested. There is no support for reading or writing the EEPROM connected to the PLX PCI bus controller. BSD
May 17, 2000 BSD