Hello,
Is ROM bootloader on C6748 using SPI_ENA pin if it is booting from SPI flash?
The problem is that my application image is about 700 KB and I would like to load it as fast as possible. I came up with the plan to use MICRON - N25Q032A13ESE40G serial NOR flash for booting. It has special quad mode which is very fast compared to normal SPI. I guess ROM bootloader does not support it out of the box, therefore secondary bootloader must be used.
So firstly ROM bootloader loads user bootloader using normal SPI mode. Then user bootloader loads main application using "quad" SPI mode. As far as I know I must use bitbanging for doing it. As can be seen from datasheet SPI_ENA pin does not have GPIO capability, but I might need to bitbang this pin for quad support (do not know yet for sure). If ROM bootloader does not use it, I can connect some other pin with GPIO capability to Micron N25Q hold pin, just to be in safe side with upcoming hardware design.
Andres