[LinuxBIOS] Re: Linuxbios is always 421bytes larger than allowed

[yhlu]

eric line in reset16.lds
diff -r freebios_lnxi/src/cpu/x86/16bit/reset16.lds
../freebios2/src/cpu/x86/16bit/reset16.lds
8,9c8
<       _bogus = ASSERT(_start >= 0xffff0000, "_start to low please
decrease ROM_IMAGE_SIZE");
<       _ROMTOP = 0xfffffff0;
---
>       _ROMTOP = (_start >= 0xffff0000) ? 0xfffffff0 : 0xfffffff8;

So i suggest we put the line in reset16.lds and dont accept the line
in ldscript.lb

YH


On 6/27/05, yhlu <yinghailu at gmail.com> wrote:
> eric's line is
> 
> diff -r freebios_lnxi/src/arch/i386/init/ldscript.lb
> ../freebios2/src/arch/i386/init/ldscript.lb
> 45,49d44
> <       /* Move up the location counter if the start of the rom section is
> <        * too low.
> <        */
> <       . = ( ( ( _ROMBASE + ROM_IMAGE_SIZE  - 1 ) == 0xffffffff ) &&
> ( . < 0xffff0000 ) ) ? 0xffff0000 : . ;
> <
> 
> On 6/27/05, yhlu <yinghailu at gmail.com> wrote:
> > There is two case
> > 1. auto.inc create by romcc is very big (because no call in romcc allowed), So
> >    entry32.inc+fallback.inc+auto.inc+c_start.S will be bigger than
> > 64k, the _start in entry32.inc will lower than 0xffff0000, that is not
> > allowd because some SB only allow 64k in ROM can be accessed.
> > 2. Current linuxbios_ram.rom + linuxbios_rom.rom could be greater
> > 0x64k, some time if you set ROM_IMAGE_SIZE too big, and
> > linuxbios_ram.rom is not bigger enough, it will _start in entry32.inc
> > lower than 0xffff0000. That is more easy happen when you are trying to
> > enable VGA CONSOLE so increase the value, but when you disable that
> > and forget change ROM_IMAGE_SIZE back.
> >
> > Solution will be
> > for 2. Eric added one line in ldsripts.lds to force linuxbios_rom.rom
> > start only from 0xffff0000, if the ROM_IMAGE_SIZE is set to big.
> >
> > for 1. esp for four way and 8 way system, my solution is
> > auto.inc+(jmp to c_start.s)+entry32.inc+fallback.inc+(jmp to auto.c)+c_start.S
> > So we can keep _start in entry32.inc still high than 0xffff0000. and
> > fallback.inc will enable the 4M space from ROM access.
> > You can not together 1 with 2 solution.
> >
> > Fortunely, when using cache_as_ram, even enable every debug info and
> > in 8 way system, the entry32.inc+auto.c+c_start.s (inc mode) and init
> > mode will never be great than 64k bytes. So we can put eric's line in
> > ldsscript.lds.
> > but if someone still like romcc for four way and 8 way system you need
> > to remove that line.
> >
> > Hope it is clear enough.
> >
> > YH
> >
> >
> >
> > On 6/27/05, Ronald G. Minnich <rminnich at lanl.gov> wrote:
> > >
> > >
> > > On Mon, 27 Jun 2005, Steve Magnani wrote:
> > >
> > > > On an editorial note, it's nice that the build system catches this
> > > > problem, but I really wish it did it in a way that made it more obvious
> > > > what the problem is.
> > >
> > > you are absolutely right. This is on a list of things we are fixing this
> > > summer.
> > >
> > > ron
> > >
> > > _______________________________________________
> > > LinuxBIOS mailing list
> > > LinuxBIOS at openbios.org
> > > http://www.openbios.org/mailman/listinfo/linuxbios
> > >
> >
>