This patch from Thomas Kleffel (the author of s3cmci) should fix our
SD/MMC instability problems.

Signed-off-by: Harald Welte <laforge@openmoko.org>

Index: linux-2.6.17.14-fic4.test/drivers/mmc/s3cmci.c
===================================================================
--- linux-2.6.17.14-fic4.test.orig/drivers/mmc/s3cmci.c	2007-02-07 20:39:12.000000000 +0100
+++ linux-2.6.17.14-fic4.test/drivers/mmc/s3cmci.c	2007-02-10 02:31:13.000000000 +0100
@@ -667,7 +667,7 @@
 #endif
 	//Cleanup controller
 	writel(0, host->base + S3C2410_SDICMDARG);
-	writel(0, host->base + S3C2410_SDIDCON);
+	writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 	writel(0, host->base + S3C2410_SDICMDCON);
 	writel(0, host->base + host->sdiimsk);
 
@@ -794,7 +794,7 @@
 		dbg(host, dbg_err,
 			"mci_setup_data() transfer stillin progress.\n");
 
-		writel(0, host->base + S3C2410_SDIDCON);
+		writel(S3C2410_SDIDCON_STOP, host->base + S3C2410_SDIDCON);
 		s3cmci_reset(host);
 
 		if (0 == (stoptries--)) {