Bootloader size

Honored Contributor

20 years ago

for information:

simple bootloader:

you can write programs with the same quartus and SOPC settings and

store these programs at different locations in flash.

(Reset Address in flash at 0x00000000)

I have a c_bootloader at add 0x00000000 in flash

it can receive programs over uart (ymodem) and writes it into flash.

e.g I have c_bootloader at add=0x00000000 in flash

prog1 at add=0x00100000 in flash

prog2 at add=0x00200000 in flash

from the c_bootloader i can execute e.g. the following code to start

prog2 from flash

void (*pBoot)(void); // declare function pointer

int startadd; // declare startaddress as integer

startadd=0x200000;

pBoot=(void*)startadd;

pBoot(); // jump to new altera bootloader in flash

the trick is, that every program in flash has the small altera_bootloader

in front and copies itself from flash to ram and starts from ram. So the main

(difficult) job is done from the altera_bootloader.

the c_bootloader is just a noraml c-program, no assembler necessary.

you can use the same settings of quartus and sopc builder for the

c_bootloader and your other programs.

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