Re: [coreboot] Linux-kernel as payload

[John Lewis]

Hi,

You have to use mkelfImage to convert the bzImage to elf format. It's in 
the utils folder of coreboot.

John.

On 08/09/14 09:25, Werner Zeh wrote:
> Hi.
> I try to use the linux kernel as payload in coreboot. I use a bzImage of
> the kernel.
> When I compile, I get the following message:
> OBJCOPY    cpu/x86/smm/smm_wrap.ramstage.o
>      CC         generated/ramstage.o
>      CC         cbfs/fallback/ramstage.debug
>      OBJCOPY    cbfs/fallback/ramstage.elf
>      CBFS       coreboot.rom
>      PAYLOAD    ../bzImage (compression: none)
> E: The stage file is not in ELF format!
>      CONFIG     .config
>      CBFSPRINT  coreboot.rom
> coreboot.rom: 4096 kB, bootblocksize 848, romsize 4194304, offset 0x0
> alignment: 64 bytes
> Name                           Offset     Type         Size
> fallback/romstage              0x0        stage        20906
> fallback/ramstage              0x5200     stage        62994
> fallback/payload               0x14880    payload      1392465
> config                         0x168840   raw          3366
> (empty)                        0x1695c0   null         2713240
> Am I wrong assumimg that the image may be a real (compressed) bzImage?
> Should I use a vmlinuz better? Or is my bzImage is not suitable (maybe
> parts of it are compressed or so)?
> Thanks.

Linux-kernel as payload

[Patrick Georgi]

Am 08.09.2014 um 12:09 schrieb John Lewis:
> You have to use mkelfImage to convert the bzImage to elf format. It's in
> the utils folder of coreboot.

No, you don't.

Patrick

Linux-kernel as payload

[John Lewis]

On 08/09/14 12:37, Patrick Georgi wrote:
> Am 08.09.2014 um 12:09 schrieb John Lewis:
> > You have to use mkelfImage to convert the bzImage to elf format. It's in
> > the utils folder of coreboot.
>
> No, you don't.

I meant "You can use", okay?

John.

Linux-kernel as payload

[John Lewis]

On 08/09/14 12:40, John Lewis wrote:
> On 08/09/14 12:37, Patrick Georgi wrote:
> > Am 08.09.2014 um 12:09 schrieb John Lewis:
> > > You have to use mkelfImage to convert the bzImage to elf format. It's in
> > > the utils folder of coreboot.
> >
> > No, you don't.
>
> I meant "You can use", okay?
>
> John.

And I was also thinking using it from within SeaBIOS, and didn't make 
the distinction.

Linux-kernel as payload

[ron minnich]

As of last week, I am booting a bzimage+initramfs combination just
fine. bzimage will be fine.

It's a good idea to set the command line args, and I recomment, for testing
console=ttyS0,115200 earlyprintk=ttyS0,115200,keep

Your best bet is to do the standard trivial initramfs with a simple program:
main(){printf("hi\n"); while (1);}

Let's pretend it's called mymain.c
cc -o mymain -static mymain.c

put that in your prototype root file system with the name init. make
sure you create /dev/console. Then bundle it all up with cpio and
you've got an initramfs

I can start some notes on the wiki if you're still stuck.

ron

Linux-kernel as payload

[Patrick Georgi]

Am 08.09.2014 um 13:44 schrieb John Lewis:
> > > No, you don't.
> >
> > I meant "You can use", okay?

Sorry, my reply came across harsher than I intended..
> And I was also thinking using it from within SeaBIOS, and didn't make
> the distinction.

Ah, okay. Please note that 3c12cb03847d2db41809ae434530782a7dbef48b
fixes the issues that prevented the native linux payload feature from
working with SeaBIOS.

Maybe we should retire mkelfImage. I'm actually amazed that it still works!

Patrick

Linux-kernel as payload

[ron minnich]

I think it's time to retire mkelfImage and I can submit that patch now
if we agree.

ron