Is Serial Download available after setting BT_FUSE_SEL to 1?

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Is Serial Download available after setting BT_FUSE_SEL to 1?

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chriscowdery
Contributor V

For our target PCB, we need the GPIO that are used for Boot Configuration.

We would like to set the eFuses for BOOT_CFG1 and BOOT_CFG2 to set up QSPI NOR Flash.

To make the eFuses take effect, we have to set BT_FUSE_SEL=1.

But then, can we still access Serial Download?

The Reference Manual (table 21-9, page 1114) does not specify what happens if BT_FUSE_SEL==1 and boot_mode=01 (Serial Download).

Thanks,

Chris.

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kerryzhou
NXP TechSupport
NXP TechSupport

Hi Chris Cowdery ,

  Even you configure BT_FUSE_SEL=1, when you configure the BOOT_MODE[1:0]=01b, you still can enter the serial downloader mode, it is no relationship with BT_FUSE_SEL, just when you configure BOOT_MODE[1:0]=00b, then the ROM bootloader will check BT_FUSE_SEL.

  So, don't worry, if your board still has the BOOT_MODE two pins avaiable, you still can enter the serial download mode.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Have a great day,
Kerry

 

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kerryzhou
NXP TechSupport
NXP TechSupport

Hi Chris Cowdery ,

  Even you configure BT_FUSE_SEL=1, when you configure the BOOT_MODE[1:0]=01b, you still can enter the serial downloader mode, it is no relationship with BT_FUSE_SEL, just when you configure BOOT_MODE[1:0]=00b, then the ROM bootloader will check BT_FUSE_SEL.

  So, don't worry, if your board still has the BOOT_MODE two pins avaiable, you still can enter the serial download mode.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Have a great day,
Kerry

 

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Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

 

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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chriscowdery
Contributor V

Thankyou Kerry.

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