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iMX8QM B0 SoC memory/HDMI setting question ...

Question asked by Jui-Wen Lin on Mar 3, 2020
Latest reply on Mar 12, 2020 by Jui-Wen Lin

Dear Sir/Madam,


We need your help to provide suggestions to some major questions related to iMX8QM SoC memory

and HDMI output setting, the details please refer to the following;


1. LPDDR4 memory setting in the U-BOOT;

      In the IMXBSPPG guideline, we got a description said on i.MX 8QuadMax B0 SoC, the DDR

      initialization codes are in SCFW. Users only need to update the DCD table in SCFW and build

      new SCFW for imx-mkimage, then the U-BOOT will follow the DCD setting from SCFW,

      but we got trouble on this, no matter how hard we try, we always cannot deliver the correct

      DCD setting to U-BOOT, is any missing part we should know about the DCD setting to U-BOOT

      on iMX8QM B0 SoC?


2. HDMI output setting;

      We already lots of suggestions from NXP community about how to set an HDMI output on iMX8 SoC,

      but no one worked on our board, most of the suggestions said we can use setenv command to enable

      the HDMI output function on board with the parameter in the following;


      setenv displayinfo 'video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24'


      Is it the correct setenv setting to the H/W? We confirmed we included the HDMI firmware

      in the imx-mkimage procedure.  


Hope we can hear from you soon, thank you very much for your help.