What does jmp 0,x mean

[collapsar]

Hi，community

In the source of Bootloader_S12X of "AN4258SW", "JMP 0,x" in the starts12x.s file, why are two parameters, and 0 for what?
The source code is as follows：

Hope for advice

[ZhangJennie · Accepted solution]

Hi,

this code "jmp 0,x",

here 0 is offset.

x stored application reset vector address.

after execution jmp 0,x,  code jump to address (x+0) and execute there.

Have a great day,
Jennie Zhang

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[collapsar]

Hi，jennie

About INIT _BootStart，I found out ：

If I comment out the INIT _BootStart and add the start12.c file of the other project to this project, there will be no errors to compile again. What does the INIT keyword do?

Thanks again for your help.

Xudai Guo

[ZhangJennie]

Hi

To separate different subject, please create a new thread for your new question.

Please also add your problem  screenshot and demo project that showcase the error.

Thanks for your cooperation.

Jennie Zhang

[collapsar]

Thanks

[collapsar]

Hi，Jennie

Thank you for your help, but I have a new problem. I haven't found the detailed document, and I have to trouble you.
It is not said that INIT _BootStart is the same as VECTOR 0 _BootStart, because there is also VECTOR 0 _BootStart in the file（project.prm，Bootloader_S12X，AN4258SW）, so I will comment out the INIT _BootStart, but the Error Link Error: L1115: Function _Startup not found, why?

Have a great day,
Xudai Guo