Hi Nicholas,
Pawel Moll submitted a patch to linux-arm-kernel and the linux-mmc mailing lists to improve the Versatile Express MMC problem (Launch pad bug #632798). I have tried this fix on my vexpress and it does improve the mmc throughput. Can we pull this patch into the current Linaro kernel?
http://permalink.gmane.org/gmane.linux.kernel.mmc/6634
Thanks, Matt