bootloader jump to app issue

[thomasbao]

Hello,

    I am developing CAN Bootloader for MPC57485G. There some issue.

bootloader:

app:

my jump code:

However, after __asm__("se_blrl"), the debug show as follow:

It shows "No source available for "0xfc0400" . Could anyone help me?

And，I add clean RAM before jump, It will show as follow:

Is uSDH IRQ? But I have disable IRQGlobal, and I never use uSDH.

[lukaszadrapa]

Hi,

it makes sense that you can't see source code of the application because only elf file containing debugging information for bootloader is loaded. Please follow this HOW TO article:

https://community.nxp.com/t5/S32-Design-Studio-Knowledge-Base/HOWTO-Debug-multiple-elf-files-in-S32-...

Also make sure that all interrupts are disabled before the jump (on all levels: MSR[EE], priority registers, local enable bits in peripherals) and it's also good practice to put everything back to default reset state. This can save a lot of headache.

Regards,

Lukas

[thomasbao]

And, what the address of MSR? I could not find it in RM.
I use I2C in mybootloader, if I read some data by I2C, then jump to userapp failed, otherwise it will success. And before jump, I call the I2C_MasterDeinit() and INT_SYS_DisableIRQGlobal(), what other things I need todo? 

[lukaszadrapa · Accepted solution]

MSR is core register, it's not memory mapped. MSR register can be accessed using asm instructions mtmsr and mfmsr. For more details:

https://www.nxp.com/webapp/Download?colCode=E200Z4RM&location=null

https://www.nxp.com/webapp/Download?colCode=EREF_RM&location=null

https://www.nxp.com/docs/en/reference-manual/VLEPEM.pdf

I2C driver uses OSIF, you can find it in referenced components. It looks like configured PIT channel is still working. I2C_MasterDeinit() does not disable selected timer and INT_SYS_DisableIRQGlobal() clears MSR[EE] bit only. So, please check the OSIF/PIT. I guess that this could be the reason.

Regards,

Lukas

[thomasbao]

Thank you for your help.

[thomasbao]

Hello, Lukas

    I follow the steps as your link, but It only enter _start function in startup_MPC5748G.S. And click Resume, then it pause at my userapp main() function, not the bootloader.