Messages in this thread | | | Date | Mon, 3 Oct 2005 15:02:52 +0100 | From | Russell King <> | Subject | Re: CMD7 failing on ATP & Transcend MMC cards |
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On Mon, Oct 03, 2005 at 04:54:45PM +0300, Jarkko Lavinen wrote: > So far, the problem occured only on ATP and Transcend cards when the card > have already been detected and then mmc_detect_change() is called to > check if any new cards have been inserted. After CMD2 the next card > select command CMD7 fails due to illegal command error.
I'm not surprised. CMD2 is part way through the initialisation sequence, so no one should be sending a CMD7.
After a CMD2, the next expected command is a CMD3 for MMC cards (maybe not SD cards).
Given the code, I don't see how you can possibly be sending a CMD7 before the initialisation has completed. You need to find out why a CMD7 is being sent after CMD2.
> I got rid of the problem by simply adding call to mmc_check_cards() > at and of mmc_setup() function, which is perhaps an overkill. One could do > it also in mmc_rescan() after switching back to higher clock.
This is not a fix.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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