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imx7 serial bootloader stuck into sd/mmc manufacture mode

Question asked by kriss on Oct 22, 2018
Latest reply on Oct 24, 2018 by Yuri Muhin

Hi

 I have board with MCIMX7D5EVM10SD and I have problems to get to USB serial downloader.

Details:

eMMC connected to SDHC1

SD1_CD used as uart and is low on boot

BOOT_MODE0 = 1

BOOT_MODE1 = 0

USB_OTG1_ID = floating, 1v8 measured 

So according to manual boot loader should try SD/MMC manufacture mode before USB serial download mode. And I can see with scope this happening. Unfortunately after fail bootloader is not jumping to USB it is keep re-trying SD/MMC for ~100ms and then just stop.

 

When I make SD1_CD = 1 bootloader just go straight to USB serial and it works fine.

 

What I'm doing wrong? or is manual correct?

 

Regards

Krzysztof

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