How much RAM is required?

[Markus Armbruster]

Watch this:

$ qemu-system-x86_64 -nodefaults -vnc :0 -monitor stdio -m 16k
    QEMU 1.1.50 monitor - type 'help' for more information
    (qemu) qemu: fatal: Trying to execute code outside RAM or ROM at 0x0000000000004000

Admittedly a silly thing to try.  I don't really expect SeaBIOS to work
with 16KiB of RAM.  But I'm curious: how much does it require?

[Fred .]

Interesting question.
No idea.
Try giving it more memory until it doesn't crash then you'll
eventually find out. :)

On Wed, Aug 8, 2012 at 1:50 PM, Markus Armbruster  wrote:
> Watch this:
> $ qemu-system-x86_64 -nodefaults -vnc :0 -monitor stdio -m 16k
> QEMU 1.1.50 monitor - type 'help' for more information
> (qemu) qemu: fatal: Trying to execute code outside RAM or ROM at 0x0000000000004000
>
> Admittedly a silly thing to try.  I don't really expect SeaBIOS to work
> with 16KiB of RAM.  But I'm curious: how much does it require?
>
> SeaBIOS mailing list
> [e-mail]
> http://www.seabios.org/mailman/listinfo/seabios

[Kevin O'Connor]

On Wed, Aug 08, 2012 at 01:50:13PM +0200, Markus Armbruster wrote:
> Watch this:
> $ qemu-system-x86_64 -nodefaults -vnc :0 -monitor stdio -m 16k
> QEMU 1.1.50 monitor - type 'help' for more information
> (qemu) qemu: fatal: Trying to execute code outside RAM or ROM at 0x0000000000004000
>
> Admittedly a silly thing to try.  I don't really expect SeaBIOS to work
> with 16KiB of RAM.  But I'm curious: how much does it require?

SeaBIOS requires a minimum of 1Meg of ram.  I didn't even know one
could request less than 1meg of ram from QEMU.

-Kevin

[Markus Armbruster]

"Kevin O'Connor"  writes:
> On Wed, Aug 08, 2012 at 01:50:13PM +0200, Markus Armbruster wrote:
> > Watch this:
> > $ qemu-system-x86_64 -nodefaults -vnc :0 -monitor stdio -m 16k
> > QEMU 1.1.50 monitor - type 'help' for more information
> > (qemu) qemu: fatal: Trying to execute code outside RAM or ROM at
> >
> > 0x0000000000004000
> >
> > Admittedly a silly thing to try.  I don't really expect SeaBIOS to work
> > with 16KiB of RAM.  But I'm curious: how much does it require?
>
> SeaBIOS requires a minimum of 1Meg of ram.  I didn't even know one
> could request less than 1meg of ram from QEMU.

I'll cook up a QEMU patch to give it at least that much.

Thanks!

[Fred .]

But QEMU may use other firmware/payload than SeaBIOS which might
require less than 1 MB of RAM.

On Thu, Aug 9, 2012 at 10:15 AM, Markus Armbruster  wrote:
> "Kevin O'Connor"  writes:
> > On Wed, Aug 08, 2012 at 01:50:13PM +0200, Markus Armbruster wrote:
> > > Watch this:
> > > $ qemu-system-x86_64 -nodefaults -vnc :0 -monitor stdio -m 16k
> > > QEMU 1.1.50 monitor - type 'help' for more information
> > > (qemu) qemu: fatal: Trying to execute code outside RAM or ROM at
> > >
> > > 0x0000000000004000
> > >
> > > Admittedly a silly thing to try.  I don't really expect SeaBIOS to work
> > > with 16KiB of RAM.  But I'm curious: how much does it require?
> >
> > SeaBIOS requires a minimum of 1Meg of ram.  I didn't even know one
> > could request less than 1meg of ram from QEMU.
>
> I'll cook up a QEMU patch to give it at least that much.
>
> Thanks!
>
> SeaBIOS mailing list
> [e-mail]
> http://www.seabios.org/mailman/listinfo/seabios