Rafael J. Wysocki wrote: > On Sunday 22 February 2009, Kevin O'Connor wrote: >> Hi Stefan, >> >> I'm CC'ing lkml and coreboot mailing lists. > > (added more CCs) > >> On Thu, Feb 19, 2009 at 10:26:17PM +0100, Stefan Reinauer wrote: >>> OK, I played some more, and I finally found out it's earlyprintk and not >>> early_printk. Plus there is bootmem_debug: >>> >>> Initializing cgroup subsys cpuset >>> Initializing cgroup subsys cpu >>> Linux version 2.6.27.7-9-default (ge...@buildhost) (gcc version 4.3.2 >>> [gcc-4_3-branch re0 >>> PAT WC disabled due to known CPU erratum. >>> BIOS-provided physical RAM map: >>> BIOS-e820: 0000000000000000 - 0000000000001000 (reserved) >>> BIOS-e820: 0000000000001000 - 0000000000090000 (usable) >>> BIOS-e820: 0000000000090000 - 0000000000100000 (reserved) >>> BIOS-e820: 0000000000100000 - 000000003f7f0000 (usable) >>> BIOS-e820: 000000003f7f0000 - 0000000040000000 (reserved) >>> BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved) >> [...] >>> ACPI: no DMI BIOS year, acpi=force is required to enable ACPI >>> ACPI: Disabling ACPI support >> [...] >>> found SMP MP-table at [c00f9fc0] 000f9fc0 >>> bootmem::mark_bootmem_node nid=0 start=f9 end=fb reserve=1 flags=0 >>> bootmem::__reserve nid=0 start=f9 end=fb flags=0 >>> bootmem::__reserve silent double reserve of PFN f9 >>> bootmem::__reserve silent double reserve of PFN fa >>> BUG: Int 6: CR2 00000000 >>> EDI c00f9fd0 ESI 3f7f5410 EBP 0003f7f5 ESP c0535f20 >>> EBX c056c00c EDX 00000006 ECX 00000001 EAX c056c03c >>> err 00000000 EIP c054f8f0 CS 00000060 flg 00010046 >>> Stack: 00000000 00000000 00000001 00038000 0003f7f5 f880abf0 3f7f5410 >>> c00f9fd0 >>> 00000001 c054f91d 00000000 c054571a c0413e7e c00f9fc0 000f9fc0 >>> 00000001 >>> 3f7bf64d 00000000 3e2c5000 c054578a 00000000 c053f3b6 3f7bf64d >>> 00000000 >>> >>> So it dies because of the way it tries to reserve the MP-table. >>> >>> Here's the stack trace. >>> >>> [<c054f8f0>] mark_bootmem+0x9b/0xab >>> [<c054f91d>] reserve_bootmem+0x1d/0x1f >>> [<c054571a>] smp_scan_config+0xd9/0xfa >>> [<c054578a>] __find_smp_config+0x4f/0x6e >>> [<c053f3b6>] setup_arch+0x576/0x639 >>> [<c054ebc4>] cgroup_init_subsys+0x29/0xc9 >>> [<c053a6ac>] start_kernel+0x6b/0x31f >>> ======================= >> It looks like the problem is that the MPTable is located in the last >> 64K of memory (instead of the first few megabytes). There is a >> comment about this in arch/x86/kernel/mpparse.c: >> >> /* >> * We cannot access to MPC table to compute >> * table size yet, as only few megabytes from >> * the bottom is mapped now. >> * PC-9800's MPC table places on the very last >> * of physical memory; so that simply reserving >> * PAGE_SIZE from mpg->mpf_physptr yields BUG() >> * in reserve_bootmem. >> */ >> >> However, that comment is in an #ifdef specific to 32bit kernels. >> (Though, it's not clear to me how that code would help as it sets size >> to be a negative number.)
that should work for a long time. 0xf9fc0 < 1M is quite < max_low_pfn, so wonder why bootmem could panic. YH -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
