Date: Mon, 06 Oct 2008 00:58:28 -0600 (MDT) From: Warner Losh <imp@bsdimp.com> To: zbeeble@gmail.com Cc: mav@FreeBSD.org, freebsd-current@FreeBSD.org, freebsd-arm@FreeBSD.org, freebsd-mobile@FreeBSD.org Subject: Re: RFC: PCI SD host controller driver & mmc/mmcsd modules improvements Message-ID: <20081006.005828.104066981.imp@bsdimp.com> In-Reply-To: <5f67a8c40810052226k3070a11ah463a819c677f6307@mail.gmail.com> References: <48DEA8E7.2080503@FreeBSD.org> <5f67a8c40810052226k3070a11ah463a819c677f6307@mail.gmail.com>
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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... > I have two laptops with these controllers, but I have only SDHC media (4 and > 8 gig cards). Yes. The SDHC isolation protocol and media decoding stuff isn't written yet. Warner
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