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SubjectRe: [RFC PATCH v4 3/5] PCI: Check platform specific ECAM quirks
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On 6/29/2016 7:52 AM, Tomasz Nowicki wrote:
> On 29.06.2016 15:34, Christopher Covington wrote:
>> I'm confused by this statement. OEMID is defined as 6 bytes long and OEM
>> Table ID as 8 bytes long in the ACPI specification. As far as I can
>> tell, if your string isn't exactly that long, padding up to that length
>> is required.
>
> Well, I cannot find that requirement in ACPI spec. but I might missed
> something.

Have a look at table 5-29 in Section 5.2.6 which starts on page 114 of
ACPI 6.1

>
> I dumped my x86 machine ACPI tables and here is an example of MCFG:
>
> $ cat mcfg.dsl
> /*
> * Intel ACPI Component Architecture
> * AML/ASL+ Disassembler version 20160108-64
> * Copyright (c) 2000 - 2016 Intel Corporation
> *
> * Disassembly of mcfg.dat, Wed Jun 29 15:48:16 2016
> *
> * ACPI Data Table [MCFG]
> *
> * Format: [HexOffset DecimalOffset ByteLength] FieldName : FieldValue
> */
>
> [000h 0000 4] Signature : "MCFG" [Memory Mapped
> Configuration table]
> [004h 0004 4] Table Length : 0000003C
> [008h 0008 1] Revision : 01
> [009h 0009 1] Checksum : A9
> [00Ah 0010 6] Oem ID : "ALASKA"
> [010h 0016 8] Oem Table ID : "A M I"
> [018h 0024 4] Oem Revision : 01072009
> [01Ch 0028 4] Asl Compiler ID : "MSFT"
> [020h 0032 4] Asl Compiler Revision : 00000097
>
> [024h 0036 8] Reserved : 0000000000000000
>
> [02Ch 0044 8] Base Address : 00000000F8000000
> [034h 0052 2] Segment Group Number : 0000
> [036h 0054 1] Start Bus Number : 00
> [037h 0055 1] End Bus Number : 3F
> [038h 0056 4] Reserved : 00000000
>
> Raw Table Data: Length 60 (0x3C)
>
> 00000000 4d 43 46 47 3c 00 00 00 01 a9 41 4c 41 53 4b 41
> |MCFG<.....ALASKA|
> 00000010 41 20 4d 20 49 00 00 00 09 20 07 01 4d 53 46 54 |A M I....
> ..MSFT|
> 00000020 97 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f8
> |................|
> 00000030 00 00 00 00 00 00 00 3f 00 00 00 00 |.......?....|
>
> So in this example I have OEM table ID "A M I" 6 character long and 0
> padding.
>
> Tomasz
>
>
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--
Jeffrey Hugo
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project

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