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e5e82820f6
The problem with drive strength and things not working reliably at 50 MHz turned out to be entirely caused by the ESD diodes on the data/command/clock lines, which have a whopping 200-300 pF junction capacitance -- 6-10x higher than the 30 pF limit given by the MMC spec. After desoldering the diodes the bus seems stable at 50 MHz and with any drive strength (note MEDIUM is still fast enough even for 50 MHz, so the drive strength is unchanged). Change-Id: If9847ee4145f5ed2f7e172cfa89acad0737a897f |
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