IBM developerWorks: Meet the 2.4 Linux kernel, Part 2Sep 02, 2000, 12:35 (0 Talkback[s])
(Other stories by TW Burger)
[ Thanks to jcondon for this link. ]
"This second of two articles details the nitty-gritty expectations surrounding specialized hardware such as ports, multimedia, filesystems, and bus support in the upcoming 2.4 Linux kernel...."
"Compared to later editions of Linux 2.x, Linux 2.4 has very few changes in serial ports. It is still possible to share IRQs. Some special serial hardware devices, including multiport boards, are better supported. That's about it."
"But the parallel port subsystem has undergone major changes. 2.4 features a generic parallel port driver for abstracted communication with "unknown" types of parallel devices. Programs can use this to do PNP polling. (A side effect of the parallel port driver is that it allows the root console to be split out to a parallel port.) It is possible to configure the parallel port driver to cause console messages to be written out to a printer. This is very useful for debugging when there is a problem copying from the screen or using the printer as console on servers without a CRT. Linux 2.4 supports writing to the parallel ports using DMA, which speeds up access to printers."
"Linux 2.2 had Infrared port support in special builds that is now standard in 2.4."