There is also the SPCR table https://docs.microsoft.com/en-us/windows-hardware/drivers/serports/serial-po... This is the primary serial console
From: boot-architecture boot-architecture-bounces@lists.linaro.org on behalf of François Ozog francois.ozog@linaro.org Date: Monday, January 18, 2021 at 2:43 PM To: Grant Likely Grant.Likely@arm.com Cc: Jeff Booher-Kaeding Jeff.Booher-Kaeding@arm.com, Samer El-Haj-Mahmoud Samer.El-Haj-Mahmoud@arm.com, mbrugger@suse.com mbrugger@suse.com, Jose Marinho Jose.Marinho@arm.com, sjg@google.com sjg@google.com, bill.mills@linaro.org bill.mills@linaro.org, boot-architecture@lists.linaro.org boot-architecture@lists.linaro.org, takahiro.akashi@linaro.org takahiro.akashi@linaro.org, nd nd@arm.com, Mark Brown Mark.Brown@arm.com, atishp@atishpatra.org atishp@atishpatra.org, joakim.bech@linaro.org joakim.bech@linaro.org, daniel.thompson@linaro.org daniel.thompson@linaro.org, duwe@suse.de duwe@suse.de, Reed Hinkel Reed.Hinkel@arm.com Subject: Re: EBBR Biweekly for 18 Jan 2021 Hi
During the call you mentioned that SBBR had some defined values for console.
I can only find that the _HID="ARMH0011" identifies a SBSA com port but I don't find any standard object path that would point to the UART to use.
let's assume:
Device (COM0) { Name (_HID, "ARMH0011") // _HID: Hardware ID Name (_UID, Zero) // _UID: Unique ID Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings { Memory32Fixed (ReadWrite, 0x09000000, // Address Base 0x00001000, // Address Length ) Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, ) { 0x00000021, } }) Name (_ADR, 0x09000000) // _ADR: Address }
Device (COM1) { Name (_HID, "ARMH0011") // _HID: Hardware ID Name (_UID, One) // _UID: Unique ID Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings { Memory32Fixed (ReadWrite, 0x09002000, // Address Base 0x00001000, // Address Length ) Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, ) { 0x00000022, } }) Name (_ADR, 0x09002000) // _ADR: Address }
Which port to use as a console?
by definition we could say that _SB_.COM0 is the port to use. Or we could define _SB_.SOUT as a reference object to any of the defined UARTs.
Cheers
FF
On Mon, 18 Jan 2021 at 16:32, Grant Likely grant.likely@arm.com wrote:
On 17/01/2021 15:01, François Ozog wrote:
Hi Grant
I’d like EBBR to specify a solution to identify the default serial console out of existing optional indications.
Hi Francois,
This is a good topic. EBBR starts from the assumption that whether ACPI or DT is used for the system description, the data will follow the requirements of the technology. For ACPI I don't think we need to add any language, but it would be worthwhile to require stdout-path is specified in the DT. Do you want to propose some language?
On DT systems , we shall state that /chosen/stdout-path must point to a valid path.
On ACPI, we may get the info form _SB_.COM0 @ DSDT or specify we will get the info from SPCR table. > Regardless of the method , this is required to just boot and do not have to care about clumsy command lines with early_console or console
parameters.
Agree. Mucking with the commandline should not be required.
I like this topic be added to the agenda ?
yes. Can you also add an issue to track this topic please?
g.
Le sam. 16 janv. 2021 à 13:59, Grant Likely <grant.likely@arm.com mailto:grant.likely@arm.com> a écrit :
Hi all, Next EBBR meeting is ON for Monday, 18 Jan 2021 at 16:00 GMT. I think there is quite a backlog of items to discuss. Here's what I've gotfor
the agenda so far: * Update on specific required protocols * https://github.com/ARM-software/ebbr/issues/60 <https://github.com/ARM-software/ebbr/issues/60> * https://github.com/ARM-software/ebbr/issues/61 <https://github.com/ARM-software/ebbr/issues/61> * https://github.com/ARM-software/ebbr/issues/64 <https://github.com/ARM-software/ebbr/issues/64> * Firmware update requirements * https://github.com/ARM-software/ebbr/issues/69 <https://github.com/ARM-software/ebbr/issues/69> * DT fixup protocol proposal * https://github.com/U-Boot-EFI/EFI_DT_FIXUP_PROTOCOL <https://github.com/U-Boot-EFI/EFI_DT_FIXUP_PROTOCOL> * https://github.com/ARM-software/ebbr/issues/68 <https://github.com/ARM-software/ebbr/issues/68> * Other business If you would like to discuss anything else, please reply to thisemail.
Dial in details are here: --- Grant Likely is inviting you to a scheduled Zoom meeting. Topic: EBBR Biweekly Time: 18 Jan 2021, 16:00-17:00 GMT Join Zoom Meetinghttps://armltd.zoom.us/j/92081365511?pwd=SFZpRitXUEp3Zy9GM0h3UUZ1b1pnUT09
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-- François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group* T: +33.67221.6485 francois.ozog@linaro.org | Skype: ffozog _______________________________________________ boot-architecture mailing list boot-architecture@lists.linaro.org https://lists.linaro.org/mailman/listinfo/boot-architecture IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.