Hi Olin,

    Very good point.  I may just start by implementing the bootstrap 
with the SD card and see how much of the library I can remove from the 
finished version.

Thanks,

Tony


Olin Lathrop wrote:
> Tony Vandiver wrote:
>   
>> I'm trying to write a custom bootstrap to load in my application code
>> from an SD card.  I want to call file I/O routines located in my
>> bootstrap from my application rather than duplicating the file I/O
>> library functions in the application because it represents about 10%
>> of my code space.
>>     
>
> Think hard about whether you really want to do that.  The purpose of a
> bootloader is to allow field code upgrades.  Having the app use pieces of
> the bootloader defeats that purpose and imposes interface requirements on
> the bootloader that may be burdensome in the future.
>
> If it's only 10% of the code, then it seems like a no-brainer to duplicate
> the routines in the app and the bootloader.  Then look at which routines you
> really use in the bootloader and how you use them.  You can probably pare
> down the version in the bootloader to its bare essentials.
>
>
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