MPC5xxx中的主题 Re: MPC5744P Bootloader Address Jump Code

MPC5744P Bootloader Address Jump Code

jiajiawu — Wed, 08 Feb 2017 08:43:49 GMT

We developed a bootloader program to download application program to the MPC5744P.

The application program is generated by S32DS. The linker file is the default one, as follows:

MEMORY
{
flash_rchw : org = 0x00FA0000, len = 0x4
cpu0_reset_vec : org = 0x00FA0004, len = 0x4
m_text : org = 0x01000000, len = 2048K
m_data : org = 0x40000000, len = 384K
int_dram : org = 0x50800000, len = 64K
}

The bootloader program linker file was modified as follows:

MEMORY
{

flash_rchw : org = 0x00F98000, len = 0x4
cpu0_reset_vec : org = 0x00F98004, len = 0x4
m_text : org = 0x00F98008, len = 32K-8
m_data : org = 0x40000000, len = 384K
int_dram : org = 0x50800000, len = 64K
}

The bootloader program used the address jump code as follows:

__asm__(" e_lis %r3, 0x00FA");
__asm__(" e_ori %r3,%r3,0x0004");
__asm__(" se_mtlr %r3");
__asm__(" se_blr");

But now the address jump fails. Once the bootloader program executes the address jump code, it collapses.

I want to know:

1) Is my address jump code correct? Can you give me the correct address jump code?

2) Is my jump address correct? Can you give me the correct jump address?

3) Why the bootloader program collapses?

4) What shuould I do to fix the probrom?

PS:

1) I didn't modify the Startup_Code file startup.S, both the bootloader program and the application program use the default Startup_Code file generated by S32DS.

2) The address jump code is called in the main(), before the address jump code, there's no other initialization operation.

3) The application program is programed correctly, it can work independently.

4) We use the similar method on other MCUs such as MPC5554, MPC5634, it works correctly. But it failed on MPC5744P.

Thank you very much.

Re: MPC5744P Bootloader Address Jump Code

petervlna — Wed, 08 Feb 2017 11:58:34 GMT

Hi,

Ok, could you show me your jump address at 0xF98004?

It must looks like:

Otherwise you code wont after reset jump to your application.

Peter

Re: MPC5744P Bootloader Address Jump Code

jiajiawu — Wed, 08 Feb 2017 13:25:20 GMT

Hi Peter：

The bootloader program at 0Xf98004 is as follows:

The application program at 0XF98004 is as follows:

Thank you for your reply.

Re: MPC5744P Bootloader Address Jump Code

petervlna — Thu, 09 Feb 2017 08:20:24 GMT

Hi,

from your screenshot I see following:

1. Bootloader

SSCM module will find valid RCHW located on address 0xF98000 and the start address at 0xF98400.

First executed instruction after reset is located on address 0xF98400.

If you set debugger breakpoint there, the code will stop on this first instruction.

2. Application

There is no valid RCHW on address 0xF98000.

SSCM won't find valid RCHW and will put device into serial boot mode.

No execution of application is done.

Conclusion:

Make sure you have valid RCHW on bootable addresses and valid pointer to first instruction to be executed.

Like you have in case of bootloader screenshot.

Peter

Re: MPC5744P Bootloader Address Jump Code

jiajiawu — Fri, 10 Feb 2017 09:27:54 GMT

Hi Peter:

Our application program is located on address 0XFA0000, as follows:

So we use the address jump code in the bootloader program as follows:

__asm__(" e_lis %r3, 0x00FA");
__asm__(" e_ori %r3,%r3,0x0004");
__asm__(" se_mtlr %r3");
__asm__(" se_blr");

But the address jump fails. Once the bootloader program executes the address jump code, it collapses.

Thank you for your reply.

Re: MPC5744P Bootloader Address Jump Code

petervlna — Fri, 10 Feb 2017 09:46:04 GMT

I am not sure if I understand you.

But I will explain you how SSCM module works.

1. apply power supply.

2. SSCM search for valid RCHW

3. first valid RCHW found is processed by SSCM HW.

4. on address offset 0x4 from first valid RCHW must be located address pointing to first application instruction.

5. SSCM force micro to jump on address on 0x4h offset from valid RCHW location.

All this is done by HW!

Peter

Re: MPC5744P Bootloader Address Jump Code

lukaszadrapa — Fri, 10 Feb 2017 12:31:45 GMT

Hi,

you need to load the value which is at 0x00FA_0004 to link register, not the value 0x00FA_0004 itself.

For example:

;load address of reset vector to r12
e_lis r12,0x00FA
e_or2i r12,0x0004

   ;load reset vector to r0
   e_lwz   r0,0(r12)
   ;move reset vector to link register
   mtlr   r0
   ;branch to address in link register
   se_blrl

Regards,

Lukas

Re: MPC5744P Bootloader Address Jump Code

jiajiawu — Sat, 11 Feb 2017 15:04:09 GMT

Hi Lukas:

I think you are right.

Thank you very much.

Re: MPC5744P Bootloader Address Jump Code

dennisyuan — Mon, 20 Feb 2017 06:23:48 GMT

HI Jiajia Wu,

I have a question about bootloader download the program in MPC5634 .

How to erase and write the flash memory which is the same bank with bootloader ?

thank you !

Regards,

Dennis Yuan

Re: MPC5744P Bootloader Address Jump Code

my_souls — Mon, 17 Jul 2017 06:44:13 GMT

Hello, my application writes to the flash via the boot loader, but the jump application fails;
The following is the relevant code, how can we successfully jump to the application?

The application program linker file was modified as follows:

MEMORY
{

flash_rchw : org = 0x00FB0000, len = 0x4

                cpu0_reset_vec : org = 0x00FB0004,   len = 0x4
              m_text : org = 0x1100000, len = 256K
              m_data : org = 0x40000000,   len = 384K
                int_dram  : org = 0x50800000,   len = 64K
}

The bootloader program linker file was modified as follows:

MEMORY
{

flash_rchw : org = 0x00FA0000, len = 0x4

                cpu0_reset_vec : org = 0x00FA0004,   len = 0x4
              m_text : org = 0x1000000, len = 256K
              m_data : org = 0x40000000,   len = 384K
                int_dram  : org = 0x50800000,   len = 64K

}

The bootloader program used the address jump code as follows:

asm("e_lis %r12,0x00FB");

asm("e_or2i %r12,0x0004");
asm("e_lwz %r0,0(%r12)");
asm("se_mtlr %r0");
asm("se_blrl");

Thank you!