Messages in this thread | | | Subject | Re: holes for ISA boards... | Date | Sat, 12 Jun 1999 12:48:45 +0100 (BST) | From | Alan Cox <> |
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> embedded system... Unfortunately, the board is ISA, and maps its memory into > IO space starting at 12MB -- which according to the epson docs means > that system memory is limited to 12MB. However, the epson docs also
It does
> assume you're using an operating system for which the source is > proprietary... I figured I could somehow put a "hole" by manipulating > page flags, and came up with the following:
No. You need to put a hole in physical space. You actually need to turn off some of RAM and things, You will also need a chipset that bothers to decode all memory above RAM strictly as ISA/PCI and isnt just saying "below 1Gig is ram, cos the bios knows that too" or similar.
> Any idea what's going on? Is it impossible for me to poke a hole in memory > from 12-16MB so I can hack on this silly ISA board?
Consult the chipset documentation. You've got the kernel hole right I think, now you need to do the hardware hole
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