From 507e40079c048410051118450c76073a5c7e14b9 Mon Sep 17 00:00:00 2001 From: imp Date: Sat, 23 Dec 2017 06:11:19 +0000 Subject: [PATCH] Expand cryptic comment with inforation I've learned in the mean time about CIS3/CIS4, including studies I've done on my large collection of PC Cards bought off e-bay over the years since the original entry as well as conversations I've had at conferences. --- sys/dev/pccard/pccardvar.h | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/sys/dev/pccard/pccardvar.h b/sys/dev/pccard/pccardvar.h index ab2fdd2dccd..c6fc94245a0 100644 --- a/sys/dev/pccard/pccardvar.h +++ b/sys/dev/pccard/pccardvar.h @@ -88,10 +88,18 @@ struct pccard_product { }; /** - * Note: There's no cis3 or cis4 reported for NOMATCH / pnpinfo events for pccard - * It's unclear if we actually need that for automatic loading or not. These stirngs - * are informative, according to the standard, but I have a dim memory of using these - * strings to match things, though I can't find the example right now. + * Note: There's no cis3 or cis4 reported for NOMATCH / pnpinfo events for + * pccard It's unclear if we actually need that for automatic loading or + * not. These stirngs are informative, according to the standard. Some Linux + * drivers match on them, for example. However, FreeBSD's hardware probing is a + * little different than Linux so it turns out we don't need them. Some cards + * use CIS3 or CIS4 for a textual representation of the MAC address. In short, + * they aren't needed even though our friends in Linux have them. It is my + * belief that all the entries in Linux don't actually need to be separate there + * either, but it's hard to eliminate them and retest on old, possibly rare, + * hardware so they persist. Despite years of collecting ~300 different PC Cards + * off E-Bay, I've not been able to find any that need CIS3/CIS4 to select which + * device attaches. */ #define PCCARD_PNP_DESCR "D:#;V32:manufacturer;V32:product;Z:cisvendor;Z:cisproduct;" #define PCCARD_PNP_INFO(t) \ -- 2.45.0