On 09/22/2013 08:38 PM, Fabio Estevam wrote: > From: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > > On embedded devices, there is often a combination of removable mmc > devices (e.g. MMC/SD cards) and hard wired ones (e.g. eMMC). > Depending on the hardware configuration, the 'mmcblkN' node might > change if the removable device is available or not at boot time. > > E.g. if the removable device is attached at boot time, it might > become mmxblk0. And the hard wired one mmcblk1. But if the removable > device isn't there at boot time, the hard wired one will become > mmcblk0. This makes it somehow difficult to hard code the root device > to the non-removable device and boot fast. > > Allow the sdhci-esdhc-imx driver to retrieve the mmc aliases, so that we can > map via the device tree which mmcblk corresponds to the rootfs. > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c > - devidx = find_first_zero_bit(dev_use, max_devices); > + devidx = find_next_zero_bit(dev_use, max_devices, card->host->devidx); I'm not sure if this works; what if the SD card gets detected/removed without recycling the device name/ID a few times before the fixed eMMC is detected? So, in the perfect case this will achieve what you want, but not in some unusual cases. So I don't think it's a good idea to rely on this. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
