AWR1642: Meta Image Size

Allen35065

Part Number: AWR1642

Hi expert,

From AWR1642 Bootloader Flow document, the fallback image offset is 512KB (0x80000), does it mean the meta image size need to less than 512KB?

• Fallback images: the bootloader supports loading of images from the following locations as a fallback mechanism if one of the images is corrupted in the SDF. The locations of the images are:

– META IMG1(SDF offset – 0x0)

– META IMG2(SDF offset – 0x80000)

– META IMG3(SDF offset – 0x100000)

– META IMG4(SDF offset – 0x180000)

Regards,

Allen

over 7 years ago

0 Naveen Narayanan over 7 years ago

TI__Expert 5025 points

Hi Allen,

The size of the meta image needn't necessarily be less than 512 KB. In case you opt for 1 fallback image, then it could be placed at SDF offset 0x100000 or 0x180000, in which case the size of the Meta image can be > 512 KB.

Best regards,
Naveen

0 Allen35065 over 7 years ago in reply to Naveen Narayanan

TI__Expert 4015 points

Hi Naveen,

So if we have meta image>512KB but less than 1MB. We could use 0x0 and 0x100000 as image address, right?
Another question is which condition will cause image fallback? Is CRC error a condition?

Thank you.
Allen

0 Naveen Narayanan over 7 years ago in reply to Allen35065

TI__Expert 5025 points

Hi Allen,

Yes, that is correct.

1. You could use the offsets 0x0 and 0x100000 in this case.
2. The Meta header contains the CRC of the images present in the multicore image (meta image). If the integrity check fails, the fallback locations are checked for a valid image.

Best regards,
Naveen

0 Allen35065 over 7 years ago in reply to Naveen Narayanan

TI__Expert 4015 points

Hi Naveen,

It's clear. Thank you.

Regards,
Allen

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AWR1642: Meta Image Size