Re: ISA Memory hole at 15-16 MB

From: Alan Cox (
Date: Thu Aug 03 2000 - 09:52:32 EST

> Rubini, I came to know that at the time of 286 computers, ISA memory was
> mapped between 15 and 16MB for RAM. Since at that time nobody had more than
> 1-2 MB of RAM, people had no problems accessing the ISA memory.

Umm ROM and ISA space is 640K->1Mb.

> But now, as everybody has around 64MB RAM, so when we access that memory
> between 15 and 16MB (the ISA memory hole), are we referring to physical RAM
> or to ISA card's memory?
> Where can I get more details on this?

If you mean the VESA memory hole a few setups had then it depends on the
chipset. Standard Linux wont run with a VESA 1Mb hole

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