MCU-PLUS-SDK-AM243X: How to use SPI boot mode

liang luo

Part Number: MCU-PLUS-SDK-AM243X
Other Parts Discussed in Thread: UNIFLASH

Hi experts,

I have an question to consult.

Because current MX25LM25645G can only used with SPI mode but not OSPI mode. The related problem refer to PLUS-SDK-AM243X: 2434 EVM OSPI FLASH DIAG error

In this case, I can only use CCS to debug APP. When I download BOOT & APP through default_sbl_ospi.cfg, APP failed to load in BOOT(sbl_ospi project, see the below code).

For SBL_OSPI, I tried to modify flash config to SPI MODE and rebuild. And for default_sbl_osip.cfg, I tried to comment out the last line(... operation=flash-xip). But problem remain.

How do I need to modify the SBL_OSPI project and the default_sbl_ospi.cfg file?

int main(void)
{
    ...

        bootHandle = Bootloader_open(CONFIG_BOOTLOADER_FLASH0, &bootParams);
        if (bootHandle != NULL)
        {
            /* @Error:This function blocking forever */
            status = Bootloader_parseMultiCoreAppImage(bootHandle, &bootImageInfo);  
            ...
        }
    ...

}

over 1 year ago

0 Aakash Kedia over 1 year ago

TI__Mastermind 26145 points

Hi liang luo.

This is a custom flash. This solution requires you to follow the step by step guide to enable custom flash as mentioned here - https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/latest/exports/docs/api_guide_am243x/CUSTOM_FLASH_SUPPORT_GUIDE.html

Here is a step by step guide to test a custom flash part as mentioned here -

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1230063/faq-mcu-plus-sdk-am243x-faq-how-to-debug-develop-migrate-the-flash-driver-for-custom-flash-on-non-ti-evm-ospi-xspi

I hope this helps.

Best Regards,
Aakash

0 liang luo over 1 year ago in reply to Aakash Kedia

Prodigy 160 points

Hi Aakash,

I have already read the relavant help documents before and have tested according to the introduction in it. The current problem is that the flash chip (MX25LM25645G) we used to test OSPI mode failed, and Daniel Bermudez have replied to the same problem and it has not been solved yet: "This failure to switch to 8d mode has been observed before and we are currently working with the flash vendor to find a fix for it. As of now, we don't have any current workarounds but I can update you with more information once we find a solution." . You can see the link above for more details.

Currently we can load the bootloader normally using SPI mode. It is hoped that the APP can be started through SPI mode in the bootloader without modifying the hardware. Otherwise we can only debug APP thruough CCS, which is not conducive to the test and verification of the project.

0 Aakash Kedia over 1 year ago in reply to liang luo

TI__Mastermind 26145 points

Hi liang luo,

I am assuming you are unable to flash anything on the device and you are using a simple Flash IO example.

Did you start with 1s-1s-1s ? did that work for you at the lowest clock speed ?

Best Regards,
Aakash

0 liang luo over 1 year ago in reply to Aakash Kedia

Prodigy 160 points

Hi Aakash,

Use 1s-1s-1s work, and use 8d-8d-8d not work. This may be a compatibility issue between MX25LM25645G and AM243X, as Daniel Bermudez mentioned that it alse encountered this issue and has not yet been resolved. You can checkout out this link for more details: mcu-plus-sdk-am243x-2434-evm-ospi-flash-diag-error

So I modified flash driver to 1s-1s-1s mode in the sbl_null and sbl_uart_uniflash project, and found that BOOT could be downloaded and start successfull when I switched to the SPI BOOT MODE. But when I tried to modify the sbl_ospi project, it failed to load the APP.

I want to know how to modify the sbl_ospi project and the python script under this condition.

+1 Aakash Kedia over 1 year ago in reply to liang luo

TI__Mastermind 26145 points

Hi liang luo,

liang luo said:
I want to know how to modify the sbl_ospi project and the python script under this condition.

You need to take up the same changes that your flash driver contains for 1s-1s-1s that you have used for flashing into the SBL OSPI.

liang luo said:
But when I tried to modify the sbl_ospi project, it failed to load the APP.

What point did you see the failure ? Do you see the parse app image failure (verification of the multicore image) ?

Use this simple method to debug SBL projects - https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1119575/faq-mcu-plus-sdk-am243x-how-to-debug-sbl_qspi-for-am263-and-am273-or-sbl_ospi-for-am243-or-an-application-which-is-booted-via-ospi-qspi-boot

Best Regards,
Aakash

0 liang luo over 1 year ago in reply to Aakash Kedia

Prodigy 160 points

Hi Aakash,

Thanks for your helpful method.

Via this method, I debugged sbl_ospi project, And found the error point as shown in below picture.

x509_cert_ptr = 0x60080000. Why does accessing this address trigger an error interrupt?

0 Aakash Kedia over 1 year ago in reply to liang luo

TI__Mastermind 26145 points

Hi liang luo,

Did you really verify the flash is initialized properly ? It does not seem like that. Did you verify with a flash_io example if the flash reads and writes are working in 1s-1s-1s mode ?

Best Regards,
Aakash

0 liang luo over 1 year ago in reply to Aakash Kedia

Prodigy 160 points

Hi Aakash,

Sorry for reply later because of holiday.

I'm sure 1s-1s-1s mode normally, otherwise the uart_uniflash project can't download code to flash. I found switching SDK back to version 9.0.0.35 did not trigger the crash. Then I re-debug the project, and test success after select "Disable Auth For Application Image" .

Thanks again for your help.

+1 Aakash Kedia over 1 year ago in reply to liang luo

TI__Mastermind 26145 points

Hi liang luo,

liang luo said:
I'm sure 1s-1s-1s mode normally, otherwise the uart_uniflash project can't download code to flash.

I see.

liang luo said:
I re-debug the project, and test success after select "Disable Auth For Application Image" .

I will take this as a ticket. Looks like the image authentication does not work as expected in case of SPI mode.

Best Regards,
Aakash

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MCU-PLUS-SDK-AM243X: How to use SPI boot mode