D24740.diff
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D24740.diff
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	diff --git a/sys/dev/mmc/mmc_subr.c b/sys/dev/mmc/mmc_subr.c
	--- a/sys/dev/mmc/mmc_subr.c
	+++ b/sys/dev/mmc/mmc_subr.c
	@@ -193,7 +193,7 @@
	mmc_switch_status(device_t busdev, device_t dev, uint16_t rca, u_int timeout)
	{
	struct timeval cur, end;
	- int err;
	+ int err, crc_timeout;
	uint32_t status;

	KASSERT(timeout != 0, ("%s: no timeout", __func__));
	@@ -205,7 +205,19 @@
	*/
	end.tv_sec = end.tv_usec = 0;
	for (;;) {
	- err = mmc_send_status(busdev, dev, rca, &status);
	+ crc_timeout=0;
	+ do {
	+ /*
	+ * CRC errors indicate that the command wasn't accepted
	+ * and executed due to a communications error. Retry
	+ * CRC errors a couple of times to cope with transient
	+ * failures.
	+ *
	+ * This is required for some cheap laptops to boot.
	+ */
	+ err = mmc_send_status(busdev, dev, rca, &status);
	+ crc_timeout++;
	+ } while (err == MMC_ERR_BADCRC && crc_timeout < 10);
	if (err != MMC_ERR_NONE)
	break;
	if (R1_CURRENT_STATE(status) == R1_STATE_TRAN)