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sdmmc: handle fakescsi emulation

--- a/sys/src/9/port/sdmmc.c

+++ b/sys/src/9/port/sdmmc.c

@@ -297,9 +297,17 @@

 }

 static int

-mmcrio(SDreq*)

+mmcrio(SDreq *r)

 {

-	return -1;

+	int i, rw, count;

+	uvlong lba;

+

+	if((i = sdfakescsi(r)) != SDnostatus)

+		return r->status = i;

+	if((i = sdfakescsirw(r, &lba, &count, &rw)) != SDnostatus)

+		return i;

+	r->rlen = mmcbio(r->unit, r->lun, rw == SDwrite, r->data, count, lba);

+	return r->status = SDok;

 }

 SDifc sdmmcifc = {