C67x bootloader aftermath

Pablo Losada

Hi everybody,

I have a question about the C6748 Bootloader application. According to th SPRAAT2F Application Note (Using the C67x Bootloader - www.ti.com/.../sprabb1c.pdf), after the Jump & Close command the bootloader transfers control to the user application that has been copied to the DSP's memory. The actual description of this command is:

"The Jump & Close command is used to mark the end of AIS. On receiving this command, the bootloader
closes the boot peripheral, restores the selected configurations of the device to its default state, and then
transfers control to the user application."

So, if I configured the clocking system of the C6748 and the DDR2 controller through bootloader commands, does the previous paragraph mean that PLL0, PLL1 and the DDR2 controller are always restored to their default state after the Jump&Close command is issued? I mean, if the bootloader configured the previous peripherals to initialize a section that resides within the DDR2 addressing space, would that section be lost after this command? In that case I would need a secondary bootloader right?

Thank you very much in advance.

over 10 years ago

0 Pablo Losada over 10 years ago

Prodigy 160 points

EDIT: Now the question is complete.

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Hi Pablo,
AIS commands are used to boot from flash devices like NAND, SPI,NOR.
You can configure the DDR,PLL,PINMUX,PSC etc., through AIS commands and no need further initialization in code (app) if you did it via AIS commands.

Those command will be patched top of the app when you convert .out to AIS formatted binary. So it is post program before bootloader.

Generally secondary bootloader is not required for C674x.

I hope this helps.

What package are you working ?
starterware or CSL or any your own code ?

0 Titusrathinaraj Stalin over 10 years ago in reply to Titusrathinaraj Stalin

TI__Guru** 116100 points

You can also "Hex compare" the both AIS formatted and non-AIS formatted images.
Refer to the following TI wiki.
processors.wiki.ti.com/.../Manually_Patch_AIS_File_using_Perl_Script

0 Pablo Losada over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 160 points

Thanks for the prompt reply Titus. I'm currently working on the LCDK through the C6000 Starterware. The paragraph I highlighted in my question got me confused about the initialization process I should follow in case I booted up from the embedded NAND - I was not sure if I should initialize the clocking system and the DDR2 controller even if the AIS already did it. Your answer explains it pretty clear I think, so thank you.

Best regards,
P.

0 Titusrathinaraj Stalin over 10 years ago in reply to Pablo Losada

TI__Guru** 116100 points

Thanks for your update.

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C67x bootloader aftermath