i have a project , the cpu is imx6ul. my hardware board 's boot device is EMMC. i use the plull_up/pull_down resistor to set EMMC 8bit mode (Boot_cfg2[7~5]=110) , then i build my u-boot, zImage and dtb. i use the mfgtool download firmware to my board. all are ok , there is on error happen . during the downloading , i measured the imx6ul's SDHC2 cmd,clk,d0-d7 all ok . the debug serial have normal log info.
but after the download, i power on my board ,but the system cann't boot up, the debug serial haven't any info.
finally , i try to change the hardware emmc setting to 1 bit mode ((Boot_cfg2[7~5]=000). then i power on my board, the system can boot up.,the debug serial have booting log . all the function is ok .
i don't know , why i use 8bit mode to down firmware is successful, i measured the D0-D7 data line are ok , but
i can't boot up with 8bit mode EMMC. how to change? is my u-boot issue?