About the boot steps of the coreboot-V4

[Rock Cui]

Hi all,
I'm learnning the coreboot v4 source code. But when I read the file
entry32.inc, I don't know where the execution will jmp to after the
__protected_start.
I need help.

BRs,

Rock.

[She, Kerry]

Hello, Rock

You may need to have a look at the crt0.S,
Take amd/persimmon as an example:
#include "config.h"
 #include "src/arch/x86/init/prologue.inc"
 #include "src/cpu/x86/32bit/entry32.inc"
 #include "src/cpu/x86/fpu_enable.inc"
 #include "src/cpu/amd/agesa/cache_as_ram.inc"
 #include "mainboard/amd/persimmon/romstage.inc"
~

"build/romstage/crt0.S"

But I think it's better to learn coreboot by playing with it
on a mainboard than just reading the code.
thanks
> -----Original Message-----
> From: coreboot-bounces+kerry.she=[e-mail]

[mailto:coreboot-
> bounces+kerry.she=[e-mail]] On Behalf Of Rock Cui
> Sent: Wednesday, December 07, 2011 1:19 PM
> To: [e-mail]
> Subject: [coreboot] About the boot steps of the coreboot-V4
>
> Hi all,
> I'm learnning the coreboot v4 source code. But when I read the file
> entry32.inc, I don't know where the execution will jmp to after the
> __protected_start.
> I need help.
>
> BRs,
>
> Rock.

[Cui Lei]

Hi, Kerry

Thank you for your reply. I find after __protected_start the execution 
will go to the fpu_start (in the fpu_enable.inc), then go to the 
cache_as_ram. Now I have a new problem, on my mainboard , there are more 
than 2minutes delay between __protected_start and __fpu_start, but on 
another mainboard(I just change the romsip code in order to run), it is 
ok. If I move the fpu_start code to the entry32.inc, the delay will be 
after the __fpu_star

BRs,
Rock.
> Hello, Rock
>
> You may need to have a look at the crt0.S,
> Take amd/persimmon as an example:
> #include "config.h"
>   #include "src/arch/x86/init/prologue.inc"
>   #include "src/cpu/x86/32bit/entry32.inc"
>   #include "src/cpu/x86/fpu_enable.inc"
>   #include "src/cpu/amd/agesa/cache_as_ram.inc"
>   #include "mainboard/amd/persimmon/romstage.inc"
> ~
>
> "build/romstage/crt0.S"
>
> But I think it's better to learn coreboot by playing with it
> on a mainboard than just reading the code.
> thanks
> > -----Original Message-----
> > From: coreboot-bounces+kerry.she=[e-mail]
>
> [mailto:coreboot-
> > bounces+kerry.she=[e-mail]] On Behalf Of Rock Cui
> > Sent: Wednesday, December 07, 2011 1:19 PM
> > To: [e-mail]
> > Subject: [coreboot] About the boot steps of the coreboot-V4
> >
> > Hi all,
> > I'm learnning the coreboot v4 source code. But when I read the file
> > entry32.inc, I don't know where the execution will jmp to after the
> > __protected_start.
> > I need help.
> >
> > BRs,
> >
> > Rock.