On 10/26/20 7:06 PM, Michael Olbrich wrote:
> On Tue, Oct 20, 2020 at 09:35:30AM +0200, Ahmad Fatoum wrote:
>> On 10/20/20 9:26 AM, Uwe Kleine-König wrote:
>>> On Tue, Oct 20, 2020 at 07:08:47AM +0200, Ahmad Fatoum wrote:
Hello Uwe,
On 9/18/20 1:04 PM, Uwe Kleine-König wrote:
> For most machines having DRIVER_SERIAL_NS16550 and DRIVER_SERIAL_EFI_STDIO
> both enabled results in the output appearing twice on the serial output.
> So remove disable the lowlevel driver and rely on the EFI bios for serial.
>>>
>>> How embarrassing, s/remove //.
>>>
On the flip-side, some systems now won't output anything over serial with
the defconfig, like the one I just ran into. Maybe we should keep both
enabled, but have a quirk table, which boards to disable the 16550 for?
>>>
>>> Expecting that most systems are happy with EFI_STDIO I would suggest a
>>> quirk table for those systems which are not?!
>>
>> Doubled output is better than no output, so a defconfig that
>> by default displays anything if the BIOS is not in the quirk
>> table sounds like it's the better choice?
>
> Maybe disable CONSOLE_ACTIVATE_ALL instead? Then you should only get the
> output from one driver.
And which one should be default? You'll get more compile time coverage
with the defconfig but the user experience problem of having a defconfig
that does print nothing at all on some devices is still there.
>
> Michael
>
>>>
My board is
EFI v2.40 by American Megatrends v327691". What's yours?
barebox@barebox EFI payload:/ devinfo acpi-FACP0
[...]
Revision: 5
OemId: ALASKA
OemTableId: A M I
OemRevision: 17244169
CreatorId: 0x20494d41
CreatorRevision: 6
What's yours?
>>>
>>> I saw the doubled output on my Laptop (Lenovo T460p).
>>
>> You have serial output on your laptop?
>>
>>>
>>> dmidecode has:
>>>
>>> BIOS Information
>>> Vendor: LENOVO
>>> Version: R07ET81W (2.21 )
>>> Release Date: 12/18/2017
>>> Address: 0xE
>>> Runtime Size: 128 kB
>>> ROM Size: 16 MB
>>> Characteristics:
>>> PCI is supported
>>> PNP is supported
>>> BIOS is upgradeable
>>> BIOS shadowing is allowed
>>> Boot from CD is supported
>>> Selectable boot is supported
>>> EDD is supported
>>> 3.5"/720 kB floppy services are supported (int 13h)
>>> Print screen service is supported (int 5h)
>>> 8042 keyboard services are supported (int 9h)
>>> Serial services are supported (int 14h)
>>> Printer services are supported (int 17h)
>>> CGA/mono video services are supported (int 10h)
>>> ACPI is supported
>>> USB legacy is supported
>>> BIOS boot specification is supported
>>> Targeted content distribution is supported
>>> UEFI is supported
>>> BIOS Revision: 2.21
>>> Firmware Revision: 1.4
>>>
>>> (This is the system I write this mail on, I don't feel like rebooting to
>>> check
>>> devinfo in barebox, take a picture and then type the stuff into a mail
>>> by hand.)
>>>
>>> Best regards
>>> Uwe
>>>
>>>
>>
>> --
>> Pengutronix e.K. | |
>> Steuerwalder Str. 21 | http://www.pengutronix.de/ |
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>>
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>
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0|
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- |
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