https://bugzilla.kernel.org/show_bug.cgi?id=16096
Summary: ACPI Error: ACPI path has too many parent prefixes and
EC related issues
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: EC
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=26602)
--> (https://bugzilla.kernel.org/attachment.cgi?id=26602)
all logs
I have laptop Dell Vostro V13:
Caption: Dell Vostro V13
Product Link: http://www.dell.com/us/en/business/note ... =bsd&cs=04
Board Vendor: Dell Inc.
Board name: 0R45H1
CPU: Intel® Celeron 743 (1.2GHz, 1MB L2 cache) (Ultra Low Voltage)
Chipset: Mobile Intel® GS45 Express Chipset ICH9M-Enhanced
Graphics: Intel Graphics Media Accelerator (GMA) 4500MHD
Northbridge: GS45-GMHC
Southbridge: ICH9M-E
Motion Sensor: STM DE351DL
Super I/O chip: ITE IT8502E
Embedded controller chip: ITE IT8502E
Flash chip: Winbond 25Q16BVSIG
I always see this ACPI errors in dmesg:
[ 0.084001] ACPI Error: ACPI path has too many parent prefixes (^) - reached
beyond root node (20090903/nsaccess-429)
[ 0.084001] ACPI Error (psargs-0359): [^LPCB.EC0_.LANW] Namespace lookup
failure, AE_NOT_FOUND
[ 0.084001] ACPI Error (psparse-0537): Method parse/execution failed [\] (Node
c14edd50), AE_NOT_FOUND
I attached all needed info about my system/EC
This laptop use ITE IT8502e embedded controller (acpi) (8032 uC, which
8051-compatible)
It's base = 0x68E
This is reverse engineered part of EC code
ROM:4AC7 ___PREDEFINED BASE ADRESS___
ROM:4AC7
ROM:4AC7 000 mov DPTR, #SWUC_SWCBALR ; // Set SWC
BASE ADDRESS to "0x68E"
ROM:4ACA 000 mov A, #8Eh ;
// so the ports adresses are now this (from host view):
ROM:4ACC 000 movx @DPTR, A ; //
ROM:4ACD 000 mov DPTR, #SWUC_SWCBAHR ; // Adress Port
= 0x68Eh
ROM:4AD0 000 mov A, #6 ;
// Date Port = 0x68Fh
ROM:4AD2 000 movx @DPTR, A ; }
ROM:4AD2
ROM:4AD2 ___PREDEFINED BASE ADRESS___
and this is bios information:
# biosdecode 2.10
SMBIOS 2.5 present.
Structure Table Length: 1988 bytes
Structure Table Address: 0x000DC010
Number Of Structures: 51
Maximum Structure Size: 199 bytes
ACPI 2.0 present.
OEM Identifier: PTLTD
RSD Table 32-bit Address: 0x7DBF93A4
XSD Table 64-bit Address: 0x000000007DBF9408
BIOS32 Service Directory present.
Revision: 0
Calling Interface Address: 0x000FDBC0
PNP BIOS 1.0 present.
Event Notification: Not Supported
Real Mode 16-bit Code Address: E1FD:008B
Real Mode 16-bit Data Address: 0040:0000
16-bit Protected Mode Code Address: 0x000F832E
16-bit Protected Mode Data Address: 0x00000400
Attached file contain all needed logs: dmesg, lspci, etc...
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