AnsweredAssumed Answered

SD card interface, SD2_WP write protect signal usage

Question asked by Hyobok Ahn on Aug 21, 2017
Latest reply on Aug 21, 2017 by jimmychan


I'm working on i.MX6 Solo custom board with Yocto 4.1.15-2.1.0 GA release.

I have problem to use external SD memory card on my board.

The device driver cannot not probing SD memory card interface.

I wondering my board SD memory card interface hardware have some different from Sabresd board.

my board use SD2 interface.

i.MX6 manual said, SD2_WP must tied to low, if do not use write protection line.

(page 5602 of "i.MX6 Solo/DualLite Applications Processor Reference Manual, Rev2, 04/2015")

unfortunately, my board floating SD2_WP board now.

I guess, this is make trouble to working of SD memory interface.

My question is

1. if I floating SD2_WP, the SD memory card is not work?

2. is there any way to resolve this problem by software?

    modify device driver or device tree blob.