Real and available memory?

[Krassimir Slavchev]

Julian H. Stacey wrote:
> Krassimir Slavchev wrote:
>   
>> Hello,
>>
>> I have Vortex86-6082 with 128Mb AMI bios.
>>
>> Why the kernel reports only 80 MB available memory?
>> Is this related to BIOS or kernel settings?
>>
>> dmesg output:
>>
>> Copyright (c) 1992-2006 The FreeBSD Project.
>> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
>>         The Regents of the University of California. All rights reserved.
>> FreeBSD 6.1-STABLE #0: Wed Jul 26 10:09:06 EEST 2006
>>     root at krassi:/usr/obj/usr/src/sys/TINYBSD
>> Timecounter "i8254" frequency 1193182 Hz quality 0
>> CPU: Pentium (166.61-MHz 586-class CPU)
>>   Origin = "SiS SiS SiS "  Id = 0x505
>> real memory  = 125829120 (120 MB)
>> avail memory = 84332544 (80 MB)
>> kbd1 at kbdmux0
>> ...
>>     
>
>
> Does the mboard BIOS on monitor at boot recognise all 128 M ? 
>
> I've seen boards that only recognised 1/4 of the SIM size.
> 80 seems a bit of an odd (non hex) number though.
>
>   
Yes, at boot the board recognizes 128Mb. The RAM is embedded on the board.
The kernel reports real 120 Mb because maybe 8 Mb is used by video card.
I don't know why exact 80Mb is reported but 80 = 64+16.