Serial download detail process

[BryceWang]

I read i.MX RT1050 RM.

- In chapter 9.9, Is fig 9-18 the handshake process between host and chip?Or does it only happen on the chip side?

- About serial download protocol (SDP), when host communication with chip, is need response to each other when accept report. For example, SDP commands is WRITE_FILE. In my understanding, host send report1 to chip first, and then host send data to chip. If the first step fail, such as chip not receive the report1, what happend? When chip receives report1, will it send a response to the host?

Thank you！

[diego_charles]

Hi @BryceWang 

I hope that you are doing great! 

To my understanding fig 9-18  is the boot flow when the MCU is set to boot in serial downloader. The ROM will wait for any commands from the Host, over LPUART1 or USB1 interfaces. This command could be as simple as the following example.

sdphost -u 0x1FC9,0x0130 -j -- error-status

To which the boot ROM will simply reply as shown in the below  figure. The error command works as a simple ping command,  that the host sends to discover if the MCU is active. 

Below I provide an example, where the command write-file is used. Each command issued from the host receives a response. 

If the MCU is not in serial downloader mode, there won't be any responses from the host. 

I hope this could help, 

Diego

[BryceWang]

Hi @diego_charles 

In your answer, you use sdphost to communication from host to chip. How can i get sdphost source code?

Thanks for your answer

[diego_charles · Accepted solution]

Hi @BryceWang 

Yes, SDPHOST is meant to be used from host to chip. 

We do not provide the source code, but the executable. 

You can find  the SDPHOST and other related tools in this package Flash loader i.MX RT1060/1040 package

Best regards, 

Diego

[BryceWang]