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i386 Memory Size Problem
- From: kevin_lemay at agilent dot com
- To: ecos-discuss at sources dot redhat dot com
- Date: Mon, 24 Nov 2003 15:53:24 -0700
- Subject: [ECOS] i386 Memory Size Problem
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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