Kinetis bootloader

[akimata]

Hi

I've read some informations about bootloader on Kinetis uC(K80 or K82 for example) but i can't still fully understand it so i got some questions about it.

How do you get into bootloader mode?

Is bootloader always present on factory new chips?

Can be UART0/1/2 used to program onboard flash with my code?(in bootloader mode)

Maybe i'm looking at wrong thing but i want to flash my custom board not only using SWD programmer but in the future using simple serial-to-usb(is it possible at all?)

Thanks 

[miduo]

Hello,

I am pretty sure that below post really helpful for your issue:

https://community.nxp.com/docs/DOC-329439 

[akimata]

It helped but still i couldn't find exact answers to my questions

I am designing custom PCB with K80 chip and i need to know minimum requirements to flash my binary through uart(using simple usb to serial) or USB.

So do i need any additional elements on my pcb or i just connect to correct pins and i'm ready to go. I'm aware that for first setup factory new chip i will need jtag programmer.

Asserting NMI pin by default enters the bootloader mode on kinetis chips?

Is there any PDF where i can find informations how to flash custom binary to the chip using bootloader and UART/USB?