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Date: Fri, 1 Dec 2006 14:10:59 -0800 From: "Lu, Yinghai" <yinghai.lu@....com> To: ebiederm@...ssion.com, "Greg KH" <gregkh@...e.de>, "Andi Kleen" <ak@...e.de> cc: "Stefan Reinauer" <stepan@...esystems.de>, linuxbios@...uxbios.org, linux-kernel@...r.kernel.org Subject: RE: [LinuxBIOS] #57: libusb host program for PLX NET20DC debug device -----Original Message----- From: ebiederm@...ssion.com [mailto:ebiederm@...ssion.com] Sent: Friday, December 01, 2006 1:15 PM Peter Stuge <stuge-linuxbios@....org> writes: >> On Fri, Dec 01, 2006 at 11:19:16AM -0800, Greg KH wrote: >>> Well, earlyprintk will not work, as you need PCI up and running. >> >> Not all of it though. LinuxBIOS will probably do just enough PCI >> setup to talk to the EHCI controller and use the debug port _very_ >> soon after power on. >Right. For LinuxBIOS not a problem for earlyprintk in the kernel >somethings might need to be refactored. The challenge in the kernel >is we don't know at build to how to do a pci_read_config... early_pci_read_config? Otherwise printk will come too late, and will not get output before pci bus ops is set. >The other hard part early in the kernel is the fact that the >bar is memory mapped I/O. Which means it will need to get mapped >into the kernels page tables. several entries to map 0xfc000000 ( PCI IO mem range) in page table in head.S? YH - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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