[coreboot] [baytrail_FSP] question about lpss device with ACPI mode in win8

[cheng yichen]

Hi  Zoran

Base on the version Baytrail_coreboot_MR5_Dec-21-2015(coreboot) that is
released by Intel.
In the coreboot(Intel released and defautle is acpi mode) I can install
driver and device is workable in win8.
I can see hs-uart controller in device manage and no yellow mark.

In last coreboot source code. after I modify "pcdlpsssioenablepcimode" to
"LPSS_PCI_MODE_DISABLE". Then the lpss device will be confgured to ACPI
mode.
but the hs-uart controller and I2C controller will shown yellow mark in
win8 device manager.
Because the main controller is not workable in win8. I don't check the
sub-device device.





2016-05-16 17:16 GMT+08:00 Zoran Stojsavljevic <
zoran.stojsavljevic at gmail.com>:

> Hello Cheng,
>
> Again, I'll repeat my questions:
> [1] Are you talking about BIOS, where you are enabling in LPSS ACPI
> (disabling automatically PCI) mode?
> [2] I need better explanation of your use case... Are you using BYT MR4,
> then MR5, or instead MR4 BIOS, or...?
> [3] For WIN8.1 you need to have the following:
>       For BIOS to work (and get rid off these yellow triangles with
> question marks):
>       [A] ACPI mode in BIOS: South Cluster Configuration -> LPSS & SCC
> Configuration -> LPSS LPSS & SCC
>            Devices Mode -> Select "ACPI Mode";
>       [B] The GPIO controller driver is/should be prerequisite for HS-UART
> driver. There is a document named:
>             Intel_Processor_Win8_IO_Drivers_Gold_MR1. You should ask for
> it from INTEL support. If installed
>             correctly, you should see HS-UART Controller device under
> System Devices in Device Manager. Also
>             new unknown devices should appear: ACPI\BCM2E1A and
> ACPI\BCM4752. These devices are for
>             HS-UART Sub Device Driver;
>       [C] You should compile the UART Sub Device Driver (by 1.2.1 of Intel
> Atom E3800 Win8.1 HS-UART Sub
>             Device Driver Sample Code Guide_1.0), and install after
> building them. After that you should see Ports in
>             Device Manager.
>
> Zoran
>
> On Fri, May 13, 2016 at 5:43 AM, cheng yichen <blessyichen at gmail.com>
> wrote:
>
>>
>> HI all
>>
>> I try to enable Lpss device(i2c hs-uart) with ACPI mdoe.
>> i2c and hs-uart will show yellow mark in device manager with win8.1.
>> but I can't find the same issue in intel coreboot(versrion MR5).
>> Do you have any idea for the issue? Thank you
>>
>> --
>> coreboot mailing list: coreboot at coreboot.org
>> https://www.coreboot.org/mailman/listinfo/coreboot
>>
>
>
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