From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pali =?utf-8?q?Roh=C3=A1r?= Subject: Re: mmc does not work in qemu n900 Date: Fri, 30 Jan 2015 15:23:34 +0100 Message-ID: <201501301523.34410@pali> References: <201501262204.59305@pali> <20150126232104.GA591@fuloong-minipc.musicnaut.iki.fi> <201501271017.39808@pali> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1479837.YKCJlAsm0T"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <201501271017.39808@pali> Sender: linux-kernel-owner@vger.kernel.org To: Aaro Koskinen Cc: Chris Ball , Ulf Hansson , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Machek , Ivaylo Dimitrov , Sebastian Reichel List-Id: linux-mmc@vger.kernel.org --nextPart1479837.YKCJlAsm0T Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Tuesday 27 January 2015 10:17:39 Pali Roh=C3=A1r wrote: > On Tuesday 27 January 2015 00:21:04 Aaro Koskinen wrote: > > Hi, > >=20 > > On Mon, Jan 26, 2015 at 10:04:59PM +0100, Pali Roh=C3=A1r wrote: > > > problem? Why any of these two patches fix problem when mmc > > > is not detected by kernel in qemu (machine n900)? > > > Detection of mmc fails because function > > > mmc_send_op_cond() without one of above patches fails. > >=20 > > Has it ever worked? It could be just that QEMU's emulation > > is broken. Since the kernel works on actual HW, you > > probably should contact QEMU maintainers. > >=20 > > I don't see n900 in Debian's QEMU. There's n800 and n810 but > > I couldn't boot any of my kernels with those... > >=20 > > A. >=20 > It worked with stock Nokia kernel (2.6.28). >=20 > N900 qemu support is not in upstream qemu project, but in > linaro qemu version. You can find it e.g. in ubuntu: > http://packages.ubuntu.com/source/precise-updates/qemu-linaro Here is another alternative patch which enable internal eMMC=20 support in qemu n900: diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 9584bff..225df49 100644 =2D-- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -2330,13 +2330,13 @@ static int mmc_rescan_try_freq(struct=20 mmc_host *host, unsigned freq) sdio_reset(host); mmc_go_idle(host); =20 =2D mmc_send_if_cond(host, host->ocr_avail); =2D =2D /* Order's important: probe SDIO, then SD, then MMC */ =2D if (!mmc_attach_sdio(host)) =2D return 0; =2D if (!mmc_attach_sd(host)) =2D return 0; +// mmc_send_if_cond(host, host->ocr_avail); +// +// /* Order's important: probe SDIO, then SD, then MMC */ +// if (!mmc_attach_sdio(host)) +// return 0; +// if (!mmc_attach_sd(host)) +// return 0; if (!mmc_attach_mmc(host)) return 0; =20 It just disable SDIO and SD code. It looks like using some SDIO=20 or SD commands on mmc controller in qemu cause problems... Any idea? =2D-=20 Pali Roh=C3=A1r pali.rohar@gmail.com --nextPart1479837.YKCJlAsm0T Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlTLk+YACgkQi/DJPQPkQ1Lm3QCffVsKTCaCDv12zt4BPaNOpY0m KgkAn1n+DswjldT5uWMVd1aM9r7oQ01l =XxLh -----END PGP SIGNATURE----- --nextPart1479837.YKCJlAsm0T--