On Tuesday 27 January 2015 10:17:39 Pali Rohár wrote: > On Tuesday 27 January 2015 00:21:04 Aaro Koskinen wrote: > > Hi, > > > > On Mon, Jan 26, 2015 at 10:04:59PM +0100, Pali Rohár 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. > > > > 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. > > > > 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... > > > > A. > > It worked with stock Nokia kernel (2.6.28). > > 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 support in qemu n900: diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 9584bff..225df49 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -2330,13 +2330,13 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) sdio_reset(host); mmc_go_idle(host); - 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; +// 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; It just disable SDIO and SD code. It looks like using some SDIO or SD commands on mmc controller in qemu cause problems... Any idea? -- Pali Rohár pali.rohar@xxxxxxxxx
Attachment:
signature.asc
Description: This is a digitally signed message part.
