From: kevin_lemay@agilent.com
To: ecos-discuss@sources.redhat.com
Subject: [ECOS] i386 Memory Size Problem
Date: Mon, 24 Nov 2003 22:53:00 -0000 [thread overview]
Message-ID: <1BEBA5E8600DD4119A50009027AF54A010FAE47E@axcs04.cos.agilent.com> (raw)
There appears to be an issue with the pcmb_misc.c file where it determines to actual amount of extended memory available.
It is reading bytes 0x17 and 0x18 from the CMOS which limits the RAM size to 64MB.
I was trying to find the proper way to find out the memory size, and found the following on the web.
Use BIOS calls:
INT 15h AX=E820h (32-bit CPU only). If this fails...
...use INT 15h AX=E801h. If this fails...
...use INT 15h AH=88h.
Read the extended memory size from CMOS only if all of the BIOS calls listed above fail.
How do I do this with eCos?
I have a large application that I am porting that allocates lots of ram. I need more than 64MB.
Kevin
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next reply other threads:[~2003-11-24 22:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-24 22:53 kevin_lemay [this message]
2003-11-25 10:57 ` Nick Garnett
2003-11-25 16:30 kevin_lemay
2003-11-25 17:29 ` Nick Garnett
2003-11-25 22:24 kevin_lemay
2003-11-26 11:45 ` Nick Garnett
2003-12-02 20:13 kevin_lemay
2003-12-03 10:29 ` Nick Garnett
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