Re: Intel Atom I2C

Hi,

On 07:05 Tue 21 Jun , Lundberg, Johannes wrote:
> Hi Imre
> 
> Thanks for the info! May I ask, isn't your system UEFI, same as mine? Last
> I tried DragonFly didn't support UEFI...

Yes, the HP x2 210 is UEFI only, but DragonFly *can* boot from UEFI :)
I did a port of FreeBSD's UEFI bootloader to DragonFly, which I commited
ca. 2 months ago, and I added basic support in the kernel for UEFI booting.
Only UEFI support in DragonFly's installer is still missing :(

> 
> I also had hangs when probing certain I2C controller (maybe it was the
> 7th...)
> 
> Perhaps using linuxkpi and the linux driver would be a good option for
> this. i915 uses I2C and it works with basically unmodified Intel source
> code. Or maybe I try to port your efforts later :)

It's not really an option here, to use the linux driver, since this I2c
bus has to integrate tightly with the operating-system for the ACPI
operation region handling, and the I2cSerialBus resource handling.

> On Tue, Jun 21, 2016 at 7:00 AM, Imre Vadasz <imre_at_vdsz.com> wrote:
> 
> > So autodetection via smbus(4) probably shouldn't be used at all for this
> > kind of I2c/smbus.
> > On my HP x2 210 Cherryview tablet it even causes the system to hard freeze,
> > when running the autodetection on the 7th I2C controller.
> >
> > Imre
> >
> 
> -- 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> 秘密保持について：この電子メールは、名宛人に送信したものであり、秘匿特権の対象となる情報を含んでいます。
> もし、名宛人以外の方が受信された場合、このメールの破棄、およびこのメールに関する一切の開示、
> 複写、配布、その他の利用、または記載内容に基づくいかなる行動もされないようお願い申し上げます。
> ---
> CONFIDENTIALITY NOTE: The information in this email is confidential
> and intended solely for the addressee.
> Disclosure, copying, distribution or any other action of use of this
> email by person other than intended recipient, is prohibited.
> If you are not the intended recipient and have received this email in
> error, please destroy the original message.