[coreboot] Re: Still need assistance porting to ASUS P8Z77-M

[Keith Hui]

Hi Frans,

Thanks for confirming.

Hi Angel,

I was unable to get any serial output, even with early serial configured.

Z77 power on defaults will see port 80 decoded by LPC according to
their datasheet, and I found Asus actually included with some boards a
POST card that plugs into the TPM header, so I'm on the right track.
Now to see if I can implement the LPC protocol correctly on an Arduino
Due, chosen for its 84MHz clock and 3.3v operation.

I looked at the source and only see the CONFIG_POST_DEVICE_* options
used by sb/amd/*/hudson, not by any Intel platform code.

I then looked at the datasheet and the lspci dump with OEM BIOS. I
would need to do something to device 0x1e.0 (disabled!) and 0x1c.6
(PCIe root port 6) and I would need new code that connects to
CONFIG_POST_DEVICE_*.

I will be back with more questions, so bear with me.

Thanks
Keith

On Fri, Feb 28, 2020 at 4:54 AM Frans Hendriks  wrote:
> Hi Keith,
>
> PCI-to-PCI bridge need to be configured before you can use PCI POST card.
>
> Default post code are send out to port 80h.
> Depending on the chipset (and your needs) you need to enable the port80 to the right channel PCI/LPC.
>
> Best regards,
> Frans Hendriks
> Eltan B.V.
>
> -----Original Message-----
> From: Angel Pons [mailto:[e-mail]]
> Sent: vrijdag 28 februari 2020 10:30
> To: Keith Hui 
> Cc: coreboot 
> Subject: [coreboot] Re: Still need assistance porting to ASUS P8Z77-M
>
> Hi Keith,
>
> On Fri, Feb 28, 2020 at 7:18 AM Keith Hui  wrote:
> > A week ago I wrote here about my problems trying to port coreboot to
> > my board. Unfortunately I am still no closer to booting.
> >
> > In the meantime I flashed my new chip with my OEM firmware backup. It
> > boots; then I flashed my patched IFD (for chip ID and flash unlock)
> > and it still boots. So it's not chip compatibility or corrupted
> > descriptor.
> >
> > The only sign of life I got is the bootblock banner left in the SPI
> > console. My PCI POST card is showing nothing, but knowing that it sits
> > on a PCIe-PCI bridge (ASM1063 that P8Z77M-PRO does not have) and not
> > knowing if it needs software init to work, I am now trying to pull
> > POST codes off the LPC bus over the TPM header, using an Arduino Due.
> > Do I have to add some early init to have port 80 accesses sent to LPC
> > bus for this to work?
>
> You have to tell coreboot where to route LPC post codes to. It defaults to "None", but you can choose PCI or LPC. I have never tried to print post codes with coreboot, though. I would try using the serial port though, as it is more practical for debugging than post codes.
> > Thanks for your help
> > Keith
> > _______________________________________________
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>
> Best regards,
>
> Angel Pons
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