MPC5xxx中的主题 Re: bootloader jump to app issue

bootloader jump to app issue

thomasbao — Sun, 12 Sep 2021 07:36:33 GMT

Hello,

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

bootloader:

app:

my jump code:

thomasbao_0-1631430716352.png

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:

thomasbao_0-1631432028314.png

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

Re: bootloader jump to app issue

lukaszadrapa — Mon, 13 Sep 2021 04:57:22 GMT

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-Design-Studio-with-GDB/ta-p/1121160

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

Re: bootloader jump to app issue

thomasbao — Mon, 13 Sep 2021 05:57:34 GMT

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.

Re: bootloader jump to app issue

thomasbao — Mon, 13 Sep 2021 13:11:25 GMT

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?

Re: bootloader jump to app issue

lukaszadrapa — Tue, 14 Sep 2021 06:34:19 GMT

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

Re: bootloader jump to app issue

thomasbao — Tue, 14 Sep 2021 12:17:33 GMT

Thank you for your help.