Date: Tue, 7 Oct 2008 14:53:20 +0200 From: Bernd Walter <ticso@cicely7.cicely.de> To: Warner Losh <imp@bsdimp.com> Cc: mav@freebsd.org, zbeeble@gmail.com, freebsd-arm@freebsd.org, freebsd-mobile@freebsd.org, freebsd-current@freebsd.org Subject: Re: RFC: PCI SD host controller driver & mmc/mmcsd modules improvements Message-ID: <20081007125320.GD25586@cicely7.cicely.de> In-Reply-To: <20081006.005828.104066981.imp@bsdimp.com> References: <48DEA8E7.2080503@FreeBSD.org> <5f67a8c40810052226k3070a11ah463a819c677f6307@mail.gmail.com> <20081006.005828.104066981.imp@bsdimp.com>
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On Mon, Oct 06, 2008 at 12:58:28AM -0600, Warner Losh wrote: > From: "Zaphod Beeblebrox" <zbeeble@gmail.com> > Subject: Re: RFC: PCI SD host controller driver & mmc/mmcsd modules improvements > Date: Mon, 6 Oct 2008 01:26:19 -0400 > > > On Sat, Sep 27, 2008 at 5:43 PM, Alexander Motin <mav@freebsd.org> wrote: > > > > > Hi. > > > > > > I would like to present initial revision of my generic PCI SD Host > > > Controller driver (sdhci). It support PCI devices with class 8 and subclass > > > 5 according to SD Host Controller Specification. With some limitations it > > > successfully works on my Acer TM6292 notebook with ENE CB714 card reader. > > > > > > > > > > Things that are not working yet: > > > - DMA modes (code is written, but as my controller looks like has broken > > > DMA I have no ability to debug it), > > > - card insert/remove detection (need more thinking), you should reload mmc > > > module to rescan cards, > > > - SDHC and MMC cards (have no such cards now to debug that code), only > > > standard capacity SD Memory cards up to 4GB size are supported now, > > > - high speed (double rate) bus mode (need more thinking and DMA support). > > > > > > Most 4G cards are SDHC that I've seen. The notes on this that I've read > > talk about the fact that you can have a 4G regular SD card but that many > > (most) devices don't support it because of the need for a larger FAT to > > support 4G. > > s/many/a few/g. 4GB SD cards work fine in every device I've tried > them in... You are quite lucky then. 4G-SD are non standard and I have a few devices where they don't work with. Sadly I even own a USB reader, which is still being sold, that doen't work with 2G cards - it just truncates them at 1G - sigh. -- B.Walter <bernd@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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