work around for busted RS-482 ACPI ? (Long)

[Nate Lawson]

Mike Tancsa wrote:
> I like in theory the specs of this board, but I guess the busted ACPI is 
> telling me to stay away.  Its an MSI RS482M4-ILD mATX S939 RS482.  The 
> default boot panics with
> 
> CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ (2193.63-MHz 
> 686-class CPU)
>   Origin = "AuthenticAMD"  Id = 0x20fb1  Stepping = 1
>   
> Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT> 
> 
>   Features2=0x1<SSE3>
>   AMD Features=0xe2500800<SYSCALL,NX,MMX+,<b25>,LM,3DNow+,3DNow>
> real memory  = 1006436352 (959 MB)
> avail memory = 975667200 (930 MB)
> ACPI APIC Table: <A M I  OEMAPIC >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
> nssearch-0397: *** Error: NsSearchAndEnter: Bad character in ACPI Name: 
> 43005350
>  dswload-0381: *** Error: Looking up [0x43005350] (NON-ASCII)
>  in namespace, AE_BAD_CHARACTER
>  psparse-0714 [09] PsParseLoop           : During name lookup/catalog, 
> AE_BAD_CHARACTER
>  tbxface-0204: *** Error: AcpiLoadTables: Could not load namespace: 
> AE_BAD_CHARACTER
>  tbxface-0213: *** Error: AcpiLoadTables: Could not load tables: 
> AE_BAD_CHARACTER
> ACPI: table load failed: AE_BAD_CHARACTER
>  utalloc-1069 [04] UtDumpAllocations     : No outstanding allocations.
> MADT: ACPI Startup failed with AE_BAD_CHARACTER
> Try disabling either ACPI or apic support.
> panic: Using MADT but ACPI doesn't work

The issue is that there's a NUL ('\0') in the namespace, at least 
referenced from the MADT.  The string is "C\0SP".  I think it would help 
if we could hack AcpiLoadTables to overwrite the \0 with a 'X' character 
instead of bailing out, then find where the X is.  Ultimately, it's 
probably better to just overwrite with '_' than to crash out.

-- 
Nate