AnsweredAssumed Answered

SDP_DISABLE not working?

Question asked by Michail G. Etairidis on Nov 12, 2018
Latest reply on Nov 15, 2018 by Yuri Muhin

Hello,

 

I am trying to set up the i.MX6UL fuses in way that would completely disable the USB serial download and JTAG functionality. My device normally boots from QSPI flash.

 

I have set the SDP_DISABLE fuse bit as described in the Reference Manual (0x460[17]) as well as the SDP_READ_DISABLE fuse (0x460[18]) and the SJC_DISABLE fuse (0x460[20]). Disabling the JTAG controller seems to work, but the USB serial download feature is still active even though I have set the "disable" fuses.

 

Reading the fuses via u-boot I get the following:

 

$ fuse read 0 6

 

$ Word 0x00000006: 00160000

 

Any idea what that might be the case?

Outcomes