Messages in this thread | | | Date | Mon, 19 Feb 2001 17:26:11 -0500 | From | Jeremy Jackson <> | Subject | Re: Kernel executation from ROM |
| |
"Eric W. Biederman" wrote:
> No it forbids executing boot roms that way, by a standard pc bios. > The system BIOS in a PC is normally on the ISA bus which is reached > across via the PCI bus with a PCI->ISA bridge.
Son of a gun, I missed that... sure enough my PIIX4 docs beside me here show a #BIOSCS pin on the southbridge... Can anybody clarify what this restriction does and doesn't apply to ? The MindShare PCI Arch. book where I got that info from doesn't elaborate that much.
> The thing is slow it really doesn't matter, all you need to do is > enable caching on that area of the physical address space. You can't > do this on the alpha currently but only because the alpha sucks that > way. You can on practically everything else. > > As for ROM being slow on x86 you can enable the MTRR to speed things
Don't MTRR's just do write combining?
> > up. Usually though ROMs are at least as expensive as RAM, so it is > pointless.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |