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dm36x boot seqence auto switch flow problem

Wonder Won
Intellectual 995 points

Hi, everyone,

      My dm368 boot mode is nand boot(BOOTSEL[2-0]; 000) and my nand flash is empty. According to dm36x hardware document, if RBL read ubl from nand flash fail, it will auto switch to sd card read ubl, if fail again, then it will aotu switch to serial port and send BOOTME with 115200,8n1. But if I insert bootable sd card, no anything was be writen to nand flash(ubl, u-boot). If I removed sd card, there is no BOOTME received from serial port.

      So, boot mode auto switch not effect? The chip document mistake? The fact RBL behavor do not support boot mode auto switch?

      The feature is import for my camera, when production or update ubl & uboot,  there is no jump switch for boot mode selection.

      Any information is grateful!