TDA4VM: Die startup issues in production

Cherry Zhou

Part Number: TDA4VM

Hi team,

Customers are currently working on a die burning scheme for TDA4 in production.

They plan to use EMMC to burn offline (burn EMMC before patches), chip boot will not start, given the chance that the patch process will cause data corruption. However, the boot dial switch is no longer retained after the board has been made and no other boot mode can be changed. If the board does not start, the EMMC can only be replaced (it's time-consuming and has heavy workload).

So the customer would like to know if TDA4 have a way to deal with this case? For example, some chips integrate a piece of code into the on-chip ROM and wait for the bootloader program to be passed into the serial port if a valid IDB (entity Block) is not recognized.

Could you help check this case? Thanks.

Best Regards,

Cherry

over 3 years ago

0 Robert Eschler over 3 years ago

TI__Guru 57425 points

The TDA4 devices support a primary boot mode and a back-up boot mode, is this what you are questioning? If the primary boot mode is not present (example is eMMC is blank), then backup boot mode will be attempted (perhaps UART or USB for downloading an image).

0 Cherry Zhou over 3 years ago in reply to Robert Eschler

TI__Mastermind 22235 points

Hi Robert,

Thanks for your support.

Switch from primary boot mode to back-up boot mode, is it required to set the boot dial switch? Or will the on-chip ROM perform this function?

Also, could you please help share the latest UART boot documentation? Since 3.4.2. Flash Tools — Processor SDK Linux for J721e Documentation is too old to apply.

Thanks and regards,

Cherry

0 Robert Eschler over 3 years ago in reply to Cherry Zhou

TI__Guru 57425 points

The primary and backup boot mode are set via boot mode pins. The switch between primary and backup modes are handled automatically by the ROM code. However - if an image is present in the primary boot but it fails to boot (due to some error), the back-up mode will NOT be automatically executed. The backup boot mode is only executed when the primary boot mode is blank.