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tiny bootloader

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meereck

Joined: 09 Nov 2006
Posts: 173

tiny bootloader

Posted: Sun Oct 14, 2007 6:16 am

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hello,
does anyone know how to achieve this with tiny bootloader?

Quote:

Requirements for your program:
The program must meet this requirement: it must have in the first 4 words of memory a GOTO to the start of the main program. (this is what the majority of the bootloaders require).

I know how to move interrupt vectors and main program:
#define LOADER_END 0x7FF
#define LOADER_SIZE 0x6FF
#build(reset=LOADER_END+1, interrupt=LOADER_END+9)
#org 0, LOADER_END {}
but I don't know how to place GOTO within the first 4 WORDs.
Has anyone tried this before me?
Thank you folks,
Meereck

asmallri

Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia


Posted: Sun Oct 14, 2007 7:30 am

#build(reset=0x000:0x0007) This will prevent the compiler from putting anything other than the jump vector below the reset vectors. _________________ Regards, Andrew http://www.brushelectronics.com/software Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!

meereck

Joined: 09 Nov 2006
Posts: 173


Posted: Sun Oct 14, 2007 9:56 am

thnx, works like a charm

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