Hi Mark, > mmc0: error -84 whilst initialising SD card Not sure how much this'll help, but: errno -84 is defined in include/asm-generic/errno.h as EILSEQ, and there are two occurences of EILSEQ in sdhci.c, one of which has a printk next to it that you aren't seeing. So, it's likely that you're seeing: else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) host->cmd->error = -EILSEQ; So, it seems like your controller is returning a successful command response, but with some sort of data error attached. Have you tried multiple SD cards, and are they known-working? If you're sure it's not the card, try passing debug_quirks=1 to the sdhci module. (Let me know if you're not sure how to do that.) Thanks, - Chris. -- Chris Ball <cjb@xxxxxxxxxx> One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html