SCSI and RAID Devices


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In effect, the reference to syncppp. At least, that’s what the kernel documentation on ISDN seems to say. Most importantly, thanks to Mr. The dscc4 driver essentially just passes these frames straight to the generic HDLC layer. There might be some cards out there that can do a G.

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Our Linux driver software is divided into two parts: If both the E1 ports were misconfigured to “clock source internal”, the setup worked, but tended to yield random hdl of lost packets as the two internal clocks wandered.

Vocabulary – obvious questions.

Linux Kernel Driver DataBase: CONFIG_HDLC: Generic HDLC layer

To sum up, the generic way to find out the link state of a particular network interface is by looking for the RUNNING flag in ‘ifconfig’ listing or using the right ioctl. Before actually discussing the individual items of the list above, let me reiterate that my goal in this mini-HOWTO is to set up a very basic IP-over-sync-serial functionality.

The crystal is usually enclosed in a vaguely rectangular hdc oblong shiny metallic package, that is very prominent on any electronics circuit board among all the black plastic semiconductor packages, colorful resistors and capacitors in insulating sleeves. At least, that’s what liunx kernel documentation on ISDN seems to say. In DSCC4 back-to-back setups, the grounding involved would use further attention. There’s no ljnux way of detecting the crystal’s frequency in software.


In fact the crystal’s specific frequency is printed on its package – it’s so precise.

Therefore I was planning to cut’n’paste their wiring tables here – except that after reading their copyright policy I didn’t dare to do that.

Halasa did a good job of separating the various HDLC-based sync encapsulations and generic network device operations from their low-level hardware stuff – PCI DMA mappings, passing buffers and hxlc link frames back’n’forth, specific ioctl ‘s, hardware configuration and interfacing, hardware intelligence etc.

Beware – this DTE cable is quite a poor hack. If you have some success stories with the older versions of all the software, feel free to send me precise descriptions of how you arrived at your operational setup – I’ll include your instructions here.

Especially given that the site is stable and doesn’t change topology too often. You need link status detection and flexible routing with floating static routes and redundant WAN connectivity. The pppd daemon cooperates with kernel-space “generic PPP” support, visible in the menuconfig menu right here:. The menuconfig help doesn’t provide much information, the contents of Config. Please report success to the maintainer.

A classic divider can provide integer parts of the crystal’s main frequency, but there’s yet another circuit called a PLL Phase-Locked Loop that can releave us of the integer divisor bdlc.

The mode parameter sets the type of hardware and the operating mode of the driver. Don’t get confused by the fact that, unlike the traditional PPP support, syncppp. In all setups, the ping roundtrips were just fine, corresponding to the bdlc serialization delay. In this section, I’m not quite sure what Linux is or is not capable of.



These two attributes are either present or absent in the output of ifconfig. An excellent source of connector pinouts lijux the Hardware Book page. Its auth parameters are set in a file. Typical values for the ser12 modem are 0x3f8, 0x2f8, 0x3e8 or 0x2e8, for the par96 modem 0x, 0x or 0x3bc, for the sbc modems 0x and for the wss modems 0x, 0x, 0xe80 or 0xf Most importantly, thanks to Mr.

A last resort solution. Even worse, the sound driver reserves the soundcard as soon as it gets loaded.

Generic PPP for Generic HDLC [1/3]

It may not be available on some modem, such as the par Such a circuit can provide precise yet programmable clock frequency. The irq parameter sets the hardware IRQ number. Would it perhaps add some FR bridging functionality to the system?

The three attributes may behave different with other media types, subinterfaces at al, but the concept is always the same. Some cards are manufactured without a crystal intended for DTE-only operation and some true die-hard users add crystals on lnux own.