[coreboot] Samsung 550 Chromebook own Coreboot

Duncan Laurie dlaurie at chromium.org
Mon Jul 29 23:34:31 CEST 2013


Lumpy should have 2GB of on-board memory and a DIMM slot that comes with a
2GB DIMM.

Coreboot seems to detect the on-board memory and finds the SPD binary for
it, any chance the DIMM slot is empty?

Memory Straps:
 - memory capacity 2GB
 - die revision 1
 - vendor Samsung
CBFS: Looking for 'spd.bin' starting from 0x700000.
CBFS: Found file (offset=0x7dc000, len=1536).


I think the console output should show a summary after the MRC binary runs,
but the verbose CBFS output is overflowing the buffer:
http://review.coreboot.org/gitweb?p=coreboot.git;a=blob;f=src/northbridge/intel/sandybridge/raminit.c;h=3eb2fb3e79c01cfc8d75319b1089bb1aafde9806;hb=HEAD#l168

-duncan



On Mon, Jul 29, 2013 at 8:14 AM, Aaron Durbin <adurbin at chromium.org> wrote:

> Kyösti,
>
> I'm not certain it's just the last entry of the e820.  mrc is just
> seeing 2GiB of ram and setting it up that way.
>
> TOUUD 0x100600000 TOLUD 0x7f200000 TOM 0x80000000
> MEBASE 0x7f800000
> IGD decoded, subtracting 32M UMA and 2M GTT
> TSEG base 0x7c800000 size 8M
> Available memory below 4GB: 1992M
> Available memory above 4GB: 6M
>
> -Aaron
>
> On Mon, Jul 29, 2013 at 10:04 AM, Kyösti Mälkki <kyosti.malkki at gmail.com>
> wrote:
> > On Mon, 2013-07-29 at 15:19 +0100, John Lewis wrote:
> >> Where do I find/build cbmem binary?
> >>
> >> Please find attached dmesg.
> >
> > Hi
> >
> > I have same issue. Only about 2Gib of 4GiB installed shows. I had not
> > noticed this until You pointed this out. Looks like a problem with the
> > last entry coreboot creates in e820 memory map.
> >
> >
> > This is from your dmesg, I see same with (close to) current master.
> >
> > [    0.000000] BIOS-e820: [mem 0x0000000100000000-0x00000001005fffff]
> usable
> >
> >
> > The coreboot image my Samsung 550 originally shipped with had this:
> >
> > [    0.000000]  BIOS-e820: 0000000100000000 - 000000014fe00000 (usable)
> >
> >
> >
> > Kyösti
> >
>
> --
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> http://www.coreboot.org/mailman/listinfo/coreboot
>
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