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.) > > The easiest way to fix this is to change SeaBIOS to copy the whole > mptable to the first megabyte. Also, we need to fix your SMBIOS so > that ACPI is used instead of the mptable. > > -Kevin -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
