Messages in this thread | | | Subject | Re: [RFC PATCH v4 3/5] PCI: Check platform specific ECAM quirks | From | Jeffrey Hugo <> | Date | Wed, 29 Jun 2016 09:38:50 -0600 |
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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 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
-- 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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