TPS65987D: The full FLASH programming over I2C

Sailor Jerry

Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65988, TPS65987

I'm studying the SLVAE21A "TPS65987 and TPS65988 SPI Flash Firmware Update Over I2C" for the purpose of writing my own EC code.

It seems the application flow described there assumes that FLASH already has the valid code in at least one region and the task is to do the safe FLASH update.

What is the procedure of programming the FLASH that has no valid image using "Full Flash Image"? Obviously the sample code will fail since there are no valid region pointers.

Should I just execute "Flem" for the entire size of the FLASH then set "FLad" to 0 and do "FLwd" for entire "Full Flash Image"?

over 4 years ago

0 Chuck Branch over 4 years ago

TI__Mastermind 32731 points

The I2C flash update flow is intended to be just an update flow, not an initial programming flow.

Most customers use 2 paths in their system to perform the initial flash programming.

1. They add a 6 pin header (4 pins for SPI and 1 for GND) and use and external flash programmer such as a TotalPhase Aardvark to program the flash during board bringup.

2. During volume production, they have the flash pre-programmed by their Contract Manufacture.

0 Sailor Jerry over 4 years ago in reply to Chuck Branch

Prodigy 45 points

Thanks Chuck. if I want to be the odd one and do the full FLASH program in situ using EC, can I still do it?

0 Chuck Branch over 4 years ago in reply to Sailor Jerry

TI__Mastermind 32731 points

Jerry,

Our code base does not support this.

You can mux the SPI bus from the TPS65987/88 to an external MCU that supports flash programming and do it that way, but we do not have firmware to make this possible,

0 Sailor Jerry over 4 years ago in reply to Chuck Branch

Prodigy 45 points

Thanks

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TPS65987D: The full FLASH programming over I2C