Re: [Flashforth-devel] building flashforth with avra?

[Christopher H. <chr...@li...>]

That you for your help.
I'm no expert on the subject at this point, but it seems like there
must be some better way to do this than filling a ton of memory each
time I upload FlashForth to a chip.  Seems like I should be able to get
something equivalent to .NRWW directive with some combination of a
named section and a section address in a linker script.
I'm mildly curious what is really going on behind that XC8 .NRWW
"addition". Unless they've somehow crossed the assembler/linker
boundry, they must pass some extra information on to the linker...?
Something that gives instructions to their own linker script, or to a
modified Gnu LD?
Anyway, sounds like I've finally got an excuse now to become an expert
on linking.

On Sat, 2021-05-01 at 06:46 +0300, Mikael Nordman wrote:
> I wrote this in an earlier post in this chain.
> "You can try with the avr-gcc, but I believe it does not support the
> .section .NRWW, code, address() directive.
> Microchip stated the address() part was their addition to XC8, but
> you can try."
> You can use the ".fill" directive instead to fill the flash memory
> with 0xffff so that the NRWW code
> starts 0x400 bytes from the end of flash.
> That solution makes for a much longer hex file, taking a longer time
> to program the hex file into the chip.
> 
> 
> On 2021-04-30 16:24, Christopher Howard wrote:
> > Hi, I've put a few hours into trying to figure out how to build
> > with just avr-gcc toolchain, without the proprietary XC8 assembler.
> > To my surprise (given my lack of knowledge) I seemed to have gotten
> > pretty far with this call
> >  
> > avr-gcc -mmcu=atmega328p -I. -D__ATmega328P__ -x assembler-with-cpp 
> > ff-libre.asm
> >  
> > Which mostly does not give errors, so long as I drop the "#include
> > <xc.h>" directive from all the files. However, I'm stuck on this
> > code:
> >  
> > ;******************************************************************
> > *
> > KERNEL_END:
> > ;***********************************************************
> > .section .nrww, code, address(NRWW_START)
> > ;*************************************************************
> >  
> > which gives error
> >  
> > ff-libre.asm: Assembler messages:
> > ff-libre.asm:6334: Error: character following name is not '#'
> >  
> > Not sure if there is some actual .section syntax incompatibility,
> > or if I need another gcc flag, or if am trying to build the wrong
> > output format (ELF, etc.)...
> >  
> >  
> > 
> > -- 
> > Christopher Howard
> > blog: https://librehacker.com
> > social: https://gnusocial.club/librehacker
> > 
> >  
> > On Fri, 2021-04-16 at 10:07 -0800, Christopher Howard wrote:
> > > Thank you. I am hoping to play around with this in the next week
> > > or so during some lunch break.
> > >  
> > > Christopher
> > >  
> > > -----Original Message-----
> > > From: Mikael Nordman <mik...@fl...>
> > > To: Christopher Howard <chr...@li...>
> > > Subject: Re: [Flashforth-devel] building flashforth with avra?
> > > Date: Fri, 16 Apr 2021 09:13:57 +0300
> > >  
> > > Hi Chris,
> > > Here is the verbose output of building with XC8.
> > > BR Mikael
> > > 
> > > 
> 
> 
> -- 
> 
> --
>  Mikael
> 
> 
-- 
Christopher Howard
blog: https://librehacker.com
social: https://gnusocial.club/librehacker