Date: Sat, 27 Jul 1996 20:49:41 +1000 From: Bruce Evans <bde@zeta.org.au> To: cat@uunet.ca, se@ZPR.Uni-Koeln.DE Cc: current@FreeBSD.org, dg@Root.COM, jkh@FreeBSD.org, scrappy@ki.net, stable@FreeBSD.org Subject: Re: ncr53c810 driver in stable/current Message-ID: <199607271049.UAA08492@godzilla.zeta.org.au>
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>The dump writes out the first few MB within less than a >second, and then the SCSI LED stays on and the system >hangs, always after accessing the same virtual address. >It took me some time to think about checking which physical >address that corresponds to that page, and to my surprise I >found that the BIOS region at e8000 is the last thing touched >by the NCR chip. I have no idea why the page at 0e8000 is >mapped into the kernel, and I do not think that I got some >device at that address. But it still causes the hang :( 0xe8000 is in the first MB so it's surprising that the first few MB got written. sddump() and wddump() write all pages from page #0 to page #MaxMem-1, so they always write the entire BIOS area. Perhaps they should write only RAM. phys_avail[] almost says where RAM is. Unfortunately, it is truncated at the start to skip the BIOS page and at the end to skip the message buffer. Brucehome | help
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