FreeBSD Developers' Handbook
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Chapter 23 ISA device drivers

Table of Contents
23.1 Synopsis
23.2 Basic information
23.3 Device_t pointer
23.4 Configuration file and the order of identifying and probing during auto-configuration
23.5 Resources
23.6 Bus memory mapping
23.7 DMA
23.8 xxx_isa_probe
23.9 xxx_isa_attach
23.10 xxx_isa_detach
23.11 xxx_isa_shutdown
23.12 xxx_intr

This chapter was written by Sergey Babkin <babkin@FreeBSD.org> Modifications for the handbook made by Murray Stokely <murray@FreeBSD.org>, Wylie Stilwell <wylie@magnesium.net>, and Valentino Vaschetto <logo@FreeBSD.org>.

23.1 Synopsis

This chapter introduces the issues relevant to writing a driver for an ISA device. The pseudo-code presented here is rather detailed and reminiscent of the real code but is still only pseudo-code. It avoids the details irrelevant to the subject of the discussion. The real-life examples can be found in the source code of real drivers. In particular the drivers ep and aha are good sources of information.

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