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Date: Sat, 12 Jun 2010 17:07:43 -0700 From: Josh Triplett <josh@...htriplett.org> To: "H. Peter Anvin" <hpa@...or.com> Cc: Ben Hutchings <ben@...adent.org.uk>, x86@...nel.org, 584846@...s.debian.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: Bug#584846: Detects only 64MB and fails to boot on Intel Green City board if e820 hooked by GRUB2 On Sat, Jun 12, 2010 at 04:02:44PM -0700, H. Peter Anvin wrote: > On 06/12/2010 03:26 PM, Josh Triplett wrote: > > > > Everything looks identical except for the region GRUB hooked right below > > the first reserved region; the unhooked version has available memory > > from 0-0x9cbf0, and the hooked version has available memory from > > 0-0x9cba0, then reserved from 0x9cba0-0x9cbec, then 4 bytes of available > > memory, and then the same reserved region as before. > > Actually... are both these done by chainloading Grub (with and without > mapping), or is the unhooked done without chainloading Grub at all? > > To me it looks like something is chaining INT 15h even in the > "unchained" case... The "unhooked" case still chainloaded from GRUB, just without calling drivemap and thus without hooking anything. I can test without chainloading from GRUB, though to the best of my knowledge GRUB doesn't hook int 15 unless it needs to intercept e820 (and e801 and 88). - Josh Triplett -- 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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