IMX6 SD card loading is always read only "resolved"

1. Description of the phenomenon

1) using the IMX6 Development Board, load 9 feet of 8G SanDisk SD card, the SD card read and write files are normal

2) after inserting the 9-foot SD card into the newly welded SD card holder, the read-only cannot be written.

2, read-only reasons

The w/p pin on the SD card holder is soldered (equivalent to being suspended). Problem solving after re-soldering w/p.

3. Cause analysis

Normally, if the lock on the SD card is not locked (not lock), the RWP line of the connection resistor is grounded.

If locked, the RWP line is non-grounded. Due to the w/p of the virtual welding, resulting in the RWP line has been non-connected, that caused the SD card has been in the write protection state.

IMX6 SD card loading is always read only "resolved"