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pmmc: recognize generic mmc controllers (untested)

--- a/sys/src/9/pc/pmmc.c

+++ b/sys/src/9/pc/pmmc.c

@@ -221,6 +221,8 @@

 	p = nil;

 	while((p = pcimatch(p, 0, 0)) != nil){

+		if(p->ccrb == 8 && p->ccru == 5)

+			break;

 		if(p->vid == 0x1180){	/* Ricoh */

 			if(p->did == 0xe822)	/* 5U822 SD/MMC */

 				break;