Re: [avr-gcc-list] Writing to flash memory from bootloader

[Ganeriwal Saurabh]

hi,

Works perfectly!

Though, i have one more query.

Why does the boot_test function has necessarily to go the bootloader
section? I thought that the access privelages were controlled by
boot lock bits. When I read them using uisp, they are all 1. When i
checked in the avr maual, it implies that there are no constraints
on the read/write access policies of different sections.

bye,
saurabh

On Mon, 8 Mar 2004, E. Weddington wrote:

> On 8 Mar 2004 at 0:19, Ganeriwal Saurabh wrote:
>
> >
> > hi,
> >
> > I have been trying to get the APIs provided in boot.h working on atmega128
> > but without any success. I use the boot_test function defined in boot.h. I
> > have added the following things to it.
> >
> > 1. Define the function to lie in .bootloader section
> > void boot_test(void) BOOTLOADER_SECTION;
> >
> > 2. Define the starting point of the bootloader section to be 0xF000 in
> > makefile.
> > LDFLAGS = atmega128 -Wl,--section-start=.bootloader=0xF000
> >
>
> WARNING: The Atmel data sheets give the bootloader addresses as WORD 
> addresses. The
> GNU tools use BYTE addresses. So loading the .bootloader section to 0xF000 is 
> incorrect.
> Multiply the value by 2: 0x1E000
>
> Eric
>
>

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