Re: Not enough memory when entering CLI

Joshua,
This is IBM BIOS, the machine is IBM blade HS22.

Few dozens lines of dmesg:
Linux version 2.6.18-128.el5 ([email protected]) (gcc
version 4.1.2 20080704 (Red Hat 4.1.2-44)) #1 SMP Wed Dec 17 11:41:38 EST
2008
Command line: root=/dev/sda6 console=tty0 console=ttyS0,115200n8
resume=/dev/sda5 splash=silent showopts
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009c000 (usable)
 BIOS-e820: 000000000009c000 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000007d9c5000 (usable)
 BIOS-e820: 000000007d9c5000 - 000000007da75000 (reserved)
 BIOS-e820: 000000007da75000 - 000000007f68f000 (usable)
 BIOS-e820: 000000007f68f000 - 000000007f6df000 (reserved)
 BIOS-e820: 000000007f6df000 - 000000007f7df000 (ACPI NVS)
 BIOS-e820: 000000007f7df000 - 000000007f7ff000 (ACPI data)
 BIOS-e820: 000000007f7ff000 - 000000007f800000 (usable)
 BIOS-e820: 000000007f800000 - 0000000090000000 (reserved)
 BIOS-e820: 00000000fed1c000 - 00000000fed20000 (reserved)
 BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved)


I tried the patch you suggested and the machine got rebooted even before
starting loading the driver. I could not even capture the screen.

Anyway, attached the output of DEBUG=relocate,hidemem,memmap without your
patch.

I appreicate your help,

Thanks,

Itay


On Wed, Oct 21, 2009 at 7:58 PM, Joshua Oreman <[email protected]> wrote:

> On Wed, Oct 21, 2009 at 1:19 PM, Joshua Oreman <[email protected]> wrote:
> > How much memory is in your client machine? It looks like the BIOS
> > isn't giving us a memory map, so we have to "guess" based on a query
> > of total installed memory. Yours is the first machine I've seen that
> > reports more than 4GB of memory via this interface, and it seems
> > there's some nasty overflow going on...
> >
> > [snip]
> >
> > I'm not too familiar with the exact mechanism of the memory map, but
> > it would seem this is a bug in gPXE. I'll work on a solution when I
> > get a bit of time, unless someone else would like to do it first :-)
>
> Found the bug:
>
> diff --git a/src/arch/i386/firmware/pcbios/memmap.c
> b/src/arch/i386/firmware/pcbios/memmap.c
> index 8a30dba..817da0b 100644
> --- a/src/arch/i386/firmware/pcbios/memmap.c
> +++ b/src/arch/i386/firmware/pcbios/memmap.c
> @@ -307,6 +307,6 @@ void get_memmap ( struct memory_map *memmap ) {
>        DBG ( "INT 15,e820 failed; constructing map\n" );
>        memmap->regions[0].end = ( basemem * 1024 );
>        memmap->regions[1].start = 0x100000;
> -       memmap->regions[1].end = 0x100000 + ( extmem * 1024 );
> +       memmap->regions[1].end = 0x100000 + ( ( uint64_t ) extmem * 1024 );
>        memmap->count = 2;
>  }
>
> Without the cast, "extmem * 1024" is truncated to 32 bits.
>
> With the cast, though, gPXE probably won't load at all, because now
> relocate() will actually follow the statement by your BIOS that you
> have 4GB+ of accessible RAM, and in your original message you say you
> have only 2GB. Even if you did have 4GB, not all of it would be
> accessible in the first 32 bits of address space, because your PCI
> devices must be mapped somewhere. Currently gPXE thinks you only have
> 16MB of memory, which explains why you can't fit the 20MB Mellanox
> card.
>
> Perhaps the output of a boot with DEBUG=relocate,memmap,hidemem would be
> useful.
>
> What type of BIOS do you have? What kind of machine? What are the
> first few dozen lines of dmesg output from a Linux boot?
>
> -- Josh
>

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