Questions about MCXA IFR0(extended bootloader, CFPA, CMPA)

[victorchiou]

1. Extended Bootloader Code and Programming
   
   According to the Reference Manual 20.2.3.3:
   "There are two extended bootloader releases to be programmed to IFR0."
   In what form will these two releases be provided?
   • Permanently programmed(like a ROM bootloader)
   • Provided as an image for the customer to program
   • Provided as source code(MCU Boot middleware in SDK) for the customer to compile - - and program (like a flash-resident bootloader)
     
     
2. Usage of the CFPA Block
   
   In the SEC's "PFR configuration" page, there is only a tab for CMPA and not for CFPA.
   Is there any risk if we access the CFPA area through blhost and flash API?
   (like write our own product serial number...etc)
   I am concerned that this block might be reserved for future official features.
   
   
3. USB String Modification
   
   According to the Reference Manual 20.5.10.1:
   "The USB VID, PID, and Strings can be customized using the CMPA of the flash."
   However, the CMPA table only includes PID and VID.
   Can the USB strings be modified as well?

BR
VictorChiou

[Alice_Yang · Accepted solution]

Hello @victorchiou 

Thanks for your questions. I will reply some answers following your questions.

1. In what form will these two releases be provided?

->>  Permanently programmed(like a ROM bootloader)

2. In the SEC's "PFR configuration" page, there is only a tab for CMPA and not for CFPA.

->> There is only CMPA in MCXA series. No CFPA.

3.  Can the USB strings be modified as well?

->> Sorry this is a typo within RM. We have reported to DOC team. The USB strings can not be modified. 

BR

Alice

[victorchiou]

hi, @Alice_Yang 

1. Extended Bootloader
About the two different bootloaders,
how can I tell which one is in the MCU's ROM when I buy it?
Do the part numbers different?

BR
victorChiou

[Alice_Yang]

Hello @victorchiou 

All the two bootloaders inside. UART-isp and USB-isp.

Depending on the values of ISP mode in the CMPA and ISP pin, bootloader decides whether to enter normal boot flow, or enter  which ISP mode.

By default, these bits are 000. So if you want to enter ISP mode, just pll-down ISPMODE_N P3_29. The first valid probe message on UART or USB will be used.

BR

Alice

[victorchiou]

hi, Alice

I see, thanks for your explain.

BR
VictorChiou