LinuxBIOS debugging with an emulator
Stephen.Kimball at bench.com
Stephen.Kimball at bench.com
Thu Oct 28 16:41:00 CEST 2004
> On Tue, 26 Oct 2004 Stephen.Kimball at bench.com wrote:
> >
> > Can someone tell me what the starting sequence is with LinuxBIOS?
> >
> > Reset jumps to crt0.s. crt0.s calls auto.E. auto.E is built using
> > romcc, so source-level debugging is not possible.
>
> ah well :-)
>
> > The statement
> > locations can be found using the Lxxxx labels in linuxbios.map.
Then
> > hardwaremain is called. Hardwaremain is the first C function called.
>
> yep.
>
> > Crt0 and auto run out of FLASH. Hardwaremain is the first function
> > called after LinuxBIOS is copied to RAM.
>
> sounds good so far.
>
> ron
It seems that LinuxBIOS copies itself to _RAMBASE, which is 0x4000.
Then it branches to 0x4000 into _start, which sets up the stack and
calls hardwaremain. The address of hardwaremain from linuxbios_c.o is
wrong. The address is not the Flash address and it's not the RAM
address. Can someone explain how linuxbios_c.o is linked with RAM
addresses?
Steve
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