https://community.nxp.com/t5/i-MX-Processors/Unable-to-get-serial-console-or-boot-linux-on-MCIMX8Q-XP-CPU-Si/m-p/2404414#M246350 <P>Hello,</P><P>I am facing issues bringing up the <STRONG>MCIMX8QXP-CPU (Silicon Revision B0)</STRONG> board.</P><H3>Hardware:</H3><UL><LI>MCIMX8QXP-CPU (Si B0)</LI><LI>MCIMX8-8X-BB baseboard</LI><LI>IMX-LVDS-HDMI adapter connected to J1</LI><LI>Original 16 GB SD card that came with the kit</LI><LI>Also tried a newly flashed 32 GB SD card with official Linux BSP (L6.18.20 / MX8QXPC0 image)</LI></UL><H3>Problem:</H3><OL><LI><STRONG>Serial console (J11)</STRONG> always shows only garbage characters (□□□□) at 115200 8N1.<UL><LI>Tried multiple COM ports</LI><LI>Tried different terminal software (PuTTY, Docklight)</LI><LI>Tried on two different Windows laptops</LI><LI>Installed latest FTDI VCP drivers</LI><LI>Same result with original kit SD card and newly flashed card</LI></UL></LI><LI><STRONG>UUU</STRONG> never detects the board in Serial Download Mode (SW2 = 1000). <SPAN>uuu -lsusb</SPAN> shows no device. Board does not appear in Device Manager when in download mode.</LI><LI><STRONG>HDMI</STRONG> – no display output so far (using IMX-LVDS-HDMI on J1).</LI></OL><H3>Boot switches tried:</H3><UL><LI>SD boot: SW2 = ON ON OFF OFF</LI><LI>Serial Download: SW2 = ON OFF OFF OFF</LI><LI>eMMC: SW2 = OFF ON OFF OFF</LI></UL><H3>What I have already done:</H3><UL><LI>Flashed official <SPAN>.Sdcard&nbsp;</SPAN>image using Balena Etcher and Rufus</LI><LI>Verified SD card is properly inserted in J12</LI><LI>Used original power supply</LI><LI>Checked multiple USB cables for the debug port</LI></UL><P>Could someone please advise:</P><P>&nbsp;</P><UL><LI>Is there any known issue with Si B0 boards regarding the debug UART?</LI><LI>Any additional steps to get clean console output?</LI><LI>Recommended way to recover / verify the board is healthy?<P>  </P></LI></UL><P>&nbsp;</P> Thu, 13 Aug 2026 05:37:28 GMT drupadh 2026-08-13T05:37:28Z https://community.nxp.com/t5/i-MX-Processors/Unable-to-get-serial-console-or-boot-linux-on-MCIMX8Q-XP-CPU-Si/m-p/2404414#M246350 <P>Hello,</P><P>I am facing issues bringing up the <STRONG>MCIMX8QXP-CPU (Silicon Revision B0)</STRONG> board.</P><H3>Hardware:</H3><UL><LI>MCIMX8QXP-CPU (Si B0)</LI><LI>MCIMX8-8X-BB baseboard</LI><LI>IMX-LVDS-HDMI adapter connected to J1</LI><LI>Original 16 GB SD card that came with the kit</LI><LI>Also tried a newly flashed 32 GB SD card with official Linux BSP (L6.18.20 / MX8QXPC0 image)</LI></UL><H3>Problem:</H3><OL><LI><STRONG>Serial console (J11)</STRONG> always shows only garbage characters (□□□□) at 115200 8N1.<UL><LI>Tried multiple COM ports</LI><LI>Tried different terminal software (PuTTY, Docklight)</LI><LI>Tried on two different Windows laptops</LI><LI>Installed latest FTDI VCP drivers</LI><LI>Same result with original kit SD card and newly flashed card</LI></UL></LI><LI><STRONG>UUU</STRONG> never detects the board in Serial Download Mode (SW2 = 1000). <SPAN>uuu -lsusb</SPAN> shows no device. Board does not appear in Device Manager when in download mode.</LI><LI><STRONG>HDMI</STRONG> – no display output so far (using IMX-LVDS-HDMI on J1).</LI></OL><H3>Boot switches tried:</H3><UL><LI>SD boot: SW2 = ON ON OFF OFF</LI><LI>Serial Download: SW2 = ON OFF OFF OFF</LI><LI>eMMC: SW2 = OFF ON OFF OFF</LI></UL><H3>What I have already done:</H3><UL><LI>Flashed official <SPAN>.Sdcard&nbsp;</SPAN>image using Balena Etcher and Rufus</LI><LI>Verified SD card is properly inserted in J12</LI><LI>Used original power supply</LI><LI>Checked multiple USB cables for the debug port</LI></UL><P>Could someone please advise:</P><P>&nbsp;</P><UL><LI>Is there any known issue with Si B0 boards regarding the debug UART?</LI><LI>Any additional steps to get clean console output?</LI><LI>Recommended way to recover / verify the board is healthy?<P>  </P></LI></UL><P>&nbsp;</P> Thu, 13 Aug 2026 05:37:28 GMT https://community.nxp.com/t5/i-MX-Processors/Unable-to-get-serial-console-or-boot-linux-on-MCIMX8Q-XP-CPU-Si/m-p/2404414#M246350 drupadh 2026-08-13T05:37:28Z