Re: temp. mem mappings

Timur Tabi
2001-06-05T20:59:38Z

** Reply to message from cohutta <cohutta@MailAndNews.com> on Tue, 5 Jun 2001
16:42:52 -0400

> I don't really want to play with the page tables if i can help it.
> I didn't use ioremap() because it's real system memory, not IO bus
> memory.
>
> How much normal memory is identity-mapped at boot on x86?
> Is it more than 8 MB?

Much more. Somewhere between 2 and 4 GB is mapped. Large memory support in
Linux has always confused me, so I can't remember exactly how much is mapped.

Keep in mind that if you want to access that memory as uncached or
write-combined, you'll need to use the method I described.

--
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com