Hi Stefan,
I'm CC'ing lkml and coreboot mailing lists.
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 (geeko@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