The device boot ROM contains bootloading software. The device ROM has an internal bootloader (programmed by TI) that is executed when the device is powered ON, and each time the device is reset. The bootloader is used as an initial program to load the application on to device RAM through any of the bootable peripherals, or it is configured to start the application in flash, if any.
Table 6-13 lists the default boot mode options. Users have the option to customize the boot modes supported as well as the boot mode select pins.
(DEFAULT BOOT MODE SELECT PIN 1)
(DEFAULT BOOT MODE SELECT PIN 0)
Table 6-14 lists the possible boot modes supported on the device. The default boot mode pins are GPIO24 (boot mode pin 1) and GPIO32 (boot mode pin 0). Users may choose to have weak pullups for boot mode pins if they use a peripheral on these pins as well, so the pullups can be overdriven. On this device, customers can change the factory default boot mode pins by programming user-configurable Dual Code Security Module (DCSM) OTP locations.
|BOOT MODE NUMBER||BOOT MODE|
All the peripheral boot modes supported use the first instance of the peripheral module (SCIA, SPIA, I2CA, CANA, and so forth). Whenever these boot modes are referred to in this section, such as SCI boot, it is actually referring to the first module instance, meaning SCI boot on the SCIA port. The same applies to the other peripheral boots.