Date: Fri, 16 Jan 2009 17:52:51 +0100 From: Dimitry Andric <dimitry@andric.com> To: Attila Nagy <bra@fsn.hu> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD panics with 64GiB of RAM Message-ID: <4970BB63.7030601@andric.com> In-Reply-To: <496B115F.1000105@fsn.hu> References: <496B115F.1000105@fsn.hu>
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On 2009-01-12 10:46, Attila Nagy wrote: > FreeBSD-CURRENT/amd64 panics at initialization with this: > http://people.fsn.hu/~bra/freebsd/20090107-freebsd-x4540/Screenshot-55.png > on a Sun X4550, equipped with two Opteron CPUs and 64 GiB of RAM. Looks like a BIOS problem, the memory map doesn't include any segment that starts at 0. This memory map seems to be provided by the loader, as stated in /usr/src/sys/amd64/amd64/machdep.c: static void getmemsize(caddr_t kmdp, u_int64_t first) { [...] /* * get memory map from INT 15:E820, kindly supplied by the loader. [...] /* * Find the 'base memory' segment for SMP */ basemem = 0; for (i = 0; i <= physmap_idx; i += 2) { if (physmap[i] == 0x00000000) { basemem = physmap[i + 1] / 1024; break; } } if (basemem == 0) panic("BIOS smap did not include a basemem segment!"); [...] Funny though, the i386 equivalent has: static void getmemsize(int first) { [...] /* * Perform "base memory" related probes & setup based on SMAP */ if (basemem == 0) { for (i = 0; i <= physmap_idx; i += 2) { if (physmap[i] == 0x00000000) { basemem = physmap[i + 1] / 1024; break; } } /* * XXX this function is horribly organized and has to the same * things that it does above here. */ if (basemem == 0) basemem = 640; if (basemem > 640) { printf( "Preposterous BIOS basemem of %uK, truncating to 640K\n", basemem); basemem = 640; } E.g. if it can't find the SMAP segment required, it just assumes 640k... should be enough for everone. ;)
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