2.6.0 incorrect memory sizing (without a full BIOS)..

From: Dave Airlie
Date: Fri Dec 19 2003 - 00:05:27 EST



Hi all,
I've got an internal development board based on the Intel 815
chipset and the Intel ACSFL mini-BIOS for embedded systems, and then using
grub 0.93 to boot Linux.

under 2.4 my memory is correctly sized at 256MB, but under 2.6 I'm only
seeing 64MB,

2.6 gives:
BIOS-provided physical RAM map:
BIOS-88: 0000000000000000 - 000000000009f000 (usable)
BIOS-88: 0000000000100000 - 00000000040ffc00 (usable)
64MB LOWMEM available

2.4 gives:
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
BIOS-e820: 00000000000e0000 - 0000000000100000 type 5
BIOS-e820: 0000000000100000 - 000000000ff00000 (usable)
BIOS-e820: 000000000ff00000 - 0000000010000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec00400 type 6
BIOS-e820: 00000000fee00000 - 00000000fee00400 type 7
BIOS-e820: 00000000fff00000 - 0000000100000000 type 5

So is this 2.6 just being more fussy about the contents of the e820 that
my "BIOS" is supplying and falling back to the old style detection?

Dave.

--
David Airlie, Software Engineer
http://www.skynet.ie/~airlied / airlied at skynet.ie
pam_smb / Linux DECstation / Linux VAX / ILUG person

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/