Messages in this thread | | | Subject | Re: Possible PCI subsystem bug in 2.4 | From | (Eric W. Biederman) | Date | 04 May 2001 09:41:51 -0600 |
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Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> > I suspect it would be safe to round up to the next megabyte, possibly up > > to 64MB or so. But much more would make me nervous. > > Any suggestions? > > I'd go for 1MByte simply because I've not seen an EBDA/NVRAM area that large > stuck at the top of RAM. 1Mb would fix the Dell. (It was only when I saw > your email it suddenely clicked and I grabbed the bootup log)
There are a couple of options here. 1) read the MTRRs unless the BIOS is braindead it will set up that area as write-back. At any rate we shouldn't ever try to allocate a pci region that is write-back cached.
2) read the memory locations from the northbridge. It's not possible on every chipset (lack of documentation) but with the linuxBIOS project we code for a couple of them, and we are working on more all of the time.
Eric
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