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What is a bootloader image?
A bootloader is a vendor-proprietary image responsible for bringing up the kernel on a device. It guards the device state and is responsible for initializing the Trusted Execution Environment and binding its root of trust.
How do you write an ARM startup code?
Reset Handler The ARM Cortex-M startup code defines the code in a separate area. This section resides in a CODE region. This line defines an area of memory containing code. The READONLY attribute makes sure that the application code does not write to this area.
When does the booting sequence of a microcontroller start?
Microcontroller booting sequence starts as soon as we apply power to the microcontroller or press the reset button. After that microcontroller fetches the first instruction from address zero where the address of reset handler will be available. TM4C123G Microcontroller Interrupt Vector Table Memory Map
How does a microcontroller start after powering up?
The most common way is a vector table where the address for the first instructions to run after powering up are in the reset vector, an address that the hardware reads then uses that address to start running. The other general way is to have the processor start executing without a vector table at some well known address.
Which is the first step in the boot process?
Even though the boot process can be a complex sequence involving multiple steps it always starts with the same first step. When the power-on reset sequence is finished and the CPU comes out of reset, the program counter is pointing to the address of the reset vector ( boot vector ).
Where does the startup file go in a microcontroller?
When you compile a specific microcontroller code in IDE such as Keil, the compiler will automatically add this startup file into your code binary image and when you upload this binary image to a microcontroller, this startup file will be available in microcontroller flash memory along with actual application program.