[FS#307] ZBT-WG3526 - mt7621 - SD card (MMC) support - [solved] but not already added to TRUNK ??

[LEDE Bugs]

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FS#307 - ZBT-WG3526 - mt7621 - SD card (MMC) support - [solved] but not already added to TRUNK ??
User who did this - camel (camel)

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hmm, not sure, if i should create another bug report ... but something is strange, or maybe is there somewhere a "DEBUG mode" in source ?

as if I'M doing anything on SD card, then:
eg: if I'm creating partition (fdisk) or checking fsck(ext2,3,4,vfat)

logread ...
Fri Dec  2 18:41:49 2016 kern.err kernel: [ 1011.220000] msdc-1 -> TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0  TUNE_BWRITE DSPL DATWRDLY MSDC_DAT_RDDLY0