iMXRT1020 Secondary Boot Loader - Flow

[harikrishnan_ch]

Hello all,

Need help in getting Secondary Image or redundant boot  flow working. 

Using FlexSPI NOR as boot device holding applications.

Here is what I have done. 

1. Primary Image at 0x6000 0000

2. Contains MBR or primary image table at 0x6000 0000

    and Secondary Image table at 0x6000 0200 : 0000_0000  0000_0000  0011_2233  0000_00C8       

    0000_0000

3. Size of primary Image is 100Kb = 102.400 bytes  -  0x19000.

4. Secondary image starts at 0x6001_9000

    Image is compiled with Initial Load Region (MBR , IVT , Boot data etc .. and Image)

5. In secondary Image table 

   firstSectorNumber in Secondary Image table is set to;  512byte sectors count of Secondary Image     

   start offset(0x19000). 

   102.400/512 = 0xC8 ;  This corresponds to Boot config/Boot record table in Secondary Image

6. Then in Primary image program following is performed to trigger Secondary image Boot on reset.

             D_PRINTF("PERSISTENT SRC_GPR10 0x%x\r\n", SRC->GPR[9] );

             SRC->GPR[9] = (0x01<<30);

             NVIC_SystemReset();

7. On Restart, the control do not load Secondary Image table and execute Secondary image. 

    It keeps entering primary image. 

8. Then Modified 

   firstSectorNumber in Secondary Image table is set to;  512byte sectors count of Secondary Image

   IVT offset (0x19000 + 0x1000). 

   106.496/512 = 0xD0 ;  This corresponds to IVT Location in Secondary Image.

9. This also yielded same result.

Please, could any one help regarding this and provide guidance?

Thanks and regards,

Harikrishnan C

[harikrishnan_ch]

Thanks for guideline. Shall follow the suggestion.

[jeremyzhou · Accepted solution]

Hi,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
To provide the fastest possible support, I'd highly recommend you to refer to the application note which illustrates how to implement a second boot loader on i.MX RT1050, i.MX RT1020, and i.MX RT1060 part based on XIP flash and you can download its demo code via the below link.
https://www.nxp.com.cn/docs/en/application-note-software/AN12604SW.zip
Have a great day,
TIC

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