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i.MX6DL boot strange result: boot mode connect Serial downloader mode (USB OTG), SD connect and could boot from SD

Question asked by Andy Chien on Oct 31, 2013
Latest reply on Nov 11, 2013 by PeterChan
Branched to a new discussion

Our customer use i.MX6DL to design a platform.

We tested boot source eMMC/ SD boot is workable.

We change boot mode to Serial downloader mode (USB OTG), then found if SD don't connect, we can connect PC into Serial downloader mode (USB OTG).

If SD connect (boot mode setting Serial downloader mode (USB OTG), we can't connect PC into Serial downloader mode (USB OTG) and system could run from SD boot.

We verified and can't found the strange result on i.MX6 SDP platform.

Could you help check it.

Thanks a lot,

 

below is use ReviewICE test and result read boot mode and boot configuration

 

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Serial downloader mode, SD unconnect 

dump /32 0x020d801c

01000001 boot from Serial downloader mode (USB OTG)

0000 0001      boot mode = 0:1

 

dump /32 0x020d8004..0x020d8007

BOOT_CFG4[7:0], BOOT_CFG3[7:0], BOOT_CFG2[7:0], BOOT_CFG1[7:0]

4000 0840

0100 0000, 0000 0000, 0000 1000, 0100 0000

--------------------------------------------------

Internal config mode(SD boot), SD connect

dump /32 0x020d801c

22000001

0010 0010   boot mode = 1:0, boot from internal configuration(board setting)

--------------------------------------------------

Serial downloader mode, SD connect

dump /32 0x020d801c

01000001

0000 0001   boot mode = 0:1, boot from Serial downloader mode (USB OTG)


And we stop system at uboot to read boot mode is 01000001 boot from Serial downloader mode (USB OTG) as attachments

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