Re: Not enough memory when entering CLI

Joshua,

Your patch did solve the issue for this specific machine.

Thanks,

Itay

On Tue, Oct 27, 2009 at 6:58 PM, Joshua Oreman <[email protected]> wrote:

> On Tue, Oct 27, 2009 at 12:46 PM, Itay Gazit <[email protected]> wrote:
> > Joshua,
> >
> > I agree, the memory map probably have not been initialized by the time I
> > tried to enter CLI during POST.
> >
> > Still I have open question:
> > How gPXE gain the 16MB memory region? what do I need to change in order
> to
> > have 20MB?
> >
> > This is not the only machine that has problem entering the CLI. We should
> > get to the bottom of it. I am willing to help with troubleshooting.
>
> The solution is in my previous email:
>
> Don't try to enter the CLI during POST. Enter the CLI when gPXE is
> invoked as a boot device, i.e. when the prompt says "Press Ctrl-B for
> the gPXE command prompt". If the confusion of having two prompts is
> too great for you or your users, edit arch/i386/prefix/romprefix.S and
> change the ROM_BANNER_TIMEOUT line near the top to
>
> #define ROM_BANNER_TIMEOUT 0
>
> gPXE thinks you have 16MB of memory because, during POST, your BIOS
> supplies complete junk when gPXE asks it for a memory count. This is
> not uncommon. Perhaps the POST-time prompt should provide only a
> limited subset of gPXE's functionality, but that has not yet been
> implemented. If you insist upon breaking into gPXE before the system
> is fully initialized, the following patch will cause it to ignore the
> junk and fall back on int 15,88h, which is a legacy interface that can
> report up to 64MB of memory; hopefully your BIOS can at least get that
> right. Again, use DEBUG=memmap to see what it's deciding on.
>
> diff --git a/src/arch/i386/firmware/pcbios/memmap.c
> b/src/arch/i386/firmware/pcbios/memmap.c
> index 8a30dba..ae9f8f3 100644
> --- a/src/arch/i386/firmware/pcbios/memmap.c
> +++ b/src/arch/i386/firmware/pcbios/memmap.c
> @@ -105,7 +105,7 @@ static unsigned int extmemsize_e801 ( void ) {
>         * would leave no address space available for 32-bit PCI
>         * BARs).
>         */
> -       if ( extmem == ( 0x400000 - 0x400 ) ) {
> +       if ( extmem >= ( 0x400000 - 0x400 ) ) {
>                DBG ( "INT 15,e801 reported whole 4GB; assuming insane\n" );
>                return 0;
>        }
>
> Let me know if this solves your problem.
>
> -- Josh
>

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