TMS320C6678: Documentation about command format for I2C Passive Boot Mode

Tool/software:

We have an application that requires the use of I2C passive boot mode to configure some registers in the device. We are able to properly configure the device in this boot mode per Table 2-5 of the datasheet, however we have not found the documentation about how to format the I2C commands that must be written by the external I2C host controller. There is a small excerpt in Section 3.7.2.4 of this document: www.ti.com/lit/SPRUGY5 (pasted below) that describes the first 6 bytes expected by the ROM bootloader, however there is no further reference to this mode and no further definition of these initial 6 bytes.

Questions:

1. Where can we find additional information about the expected I2C command format expected by the ROM bootloader in I2C passive mode?
2. Where can we find the C6678 ROM bootloader source code for PG2.0?

Thanks