imx8mmini sd/mmc manufacture mode

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imx8mmini sd/mmc manufacture mode

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Contributor I

Hello, i have a weird situation with the sd/mmc card recovery mode on my custom imx8mmini board.

When i don't burn the efuses for boot selection, it boots normally from the sdcard.

When i burn the fuses (to nand + bt_fuse_sel) it normally starts from nand

When i try to press the boot mode pin so that BOOT_MODE[1:0]=01b it's directly skipping the sdmmc card to usb downloader mode. This behaves the same, before and after burning the fuses. I am able to transfer a image via the uuu tool, so I am sure that it is in the usb dowload mode.

The Disable SDMMC Manufacture mode bit is set to 0 (didn't touch that one)

And while looking the graph i thought it should behave the same if it is boot_mode=0 + bt_fuse_sel=0 or when puting the boot_mode to 1

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Do I maybe need to fuse something else? modify my u-boot spl code? Any ideas would be appreciated!

Thanks,
Darko

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Contributor I

BT_FUSE_SEL is fused to 1

BOOT_MODE should be 1 when i press my button

My expecation is, when i press the BOOT_MODE to 1, that it behaves the same as when the BOOT_MODE = 0 + BT_FUSE_SEL = 0 but it doesn,t it jumps directly to usb download

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NXP TechSupport
NXP TechSupport

According to the Reference Manual (Table below of the Boot Mode and the boot sequence), it jumps to usb download when Boot Mode is 1.

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Contributor I

But bellow figure 6-2 this there is this comment:

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And the card is inserted on my place, as before the fusing it was going to sdcard boot...

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NXP TechSupport
NXP TechSupport

According to the 6.1.11, when the internal boot and recover boot (if enabled) failed , the boot goes to the
SD/MMC manufacture mode before the serial download mode.

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NXP TechSupport
NXP TechSupport

What is the value of BT_FUSE_SEL?

What is the value of BOOT_MODE?

What is your expectation?

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