Date: Thu, 7 Jun 2007 22:14:47 +0200 (CEST) From: =?iso-8859-1?Q?Bj=F6rn_K=F6nig?= <bkoenig@alpha-tierchen.de> To: "Neil Bradley" <nb@synthcom.com> Cc: arm@freebsd.org Subject: Re: 4-bit SD Card mode Message-ID: <54940.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181247287.squirrel@webmail.alpha-tierchen.de> In-Reply-To: <20070607123930.E75948@synthcom.com> References: <50392.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181235257.squirrel@webmail.alpha-tierchen.de> <20070607180946.GK16463@cicely12.cicely.de> <49754.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181244172.squirrel@webmail.alpha-tierchen.de> <20070607.133456.74668036.imp@bsdimp.com> <20070607123930.E75948@synthcom.com>
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M. Warner Losh wrote: >> I'm not sure I like this at all. The devices shouldn't be setting up >> the pins for that device. In some cases, they can't know how to do >> that, and this is one of them. The device has no way of knowing if >> all 4 wires are connected, or just 1 and the 'spare' lines are used >> for GPIO. and Neil Bradley replied: > Not doing it will irritate more people (i.e. "I'm not getting full speed > out of the SD card). While it's a valid concern, I don't think it's > unrealistic to assume that all 4 DAT lines are hooked up. I've not yet > encountered a design that A) had SD capabilities, B) was only running > single bit because of a lack of GPIOs. Initially I didn't have the problem that "I'm not getting full speed out of the SD card", but rather that SD Cards doesn't work at all with a vanilla FreeBSD kernel because nobody configured the PIO for the MCI controller. Björn
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