[coreboot] Asus KGPE-D16 with latest coreboot errors with Unsupported Hardware on Qubes 4 install missing IOMMU?

[petecb]

In addition to the previous info, I have found this code in sata.c, located at src/southbridge/amd/sb700 :

	/* Below is CIM InitSataLateFar */
	if (sata_ahci_mode) {
		/* Disable combined mode */
		byte = pci_read_config8(sm_dev, 0xad);
		byte &= ~(1 << 3);
		pci_write_config8(sm_dev, 0xad, byte);
	} else {
		/* Enable interrupts from the HBA  */
		byte = read8(sata_bar5 + 0x4);
		byte |= 1 << 1;
		write8((sata_bar5 + 0x4), byte);
	}


I'm wondering if my problem is related to not having any SATA drives installed? (I just have a PCI-E SSD). It may be the case that the logic to disable combined mode is not getting triggered in my scenario, yet it would do if there was a SATA drive present.


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Saturday, December 1, 2018 3:45 PM, petecb via coreboot <coreboot at coreboot.org> wrote:

> No worries, please find it attached.
>
> This output looks a little more helpful as it contains the line:
> AMD-Vi: SP5100 erratum 28 detected, disabling IOMMU.
>
> I've discovered this thread that refers to it:
> https://mail.coreboot.org/pipermail/coreboot/2017-November/085440.html
>
> It appears to be an issue with combined sata mode being enabled.
> In this case the fix may be to make an amendment to the coreboot source code to disable combined sata mode and then rebuilding it and flashing it. If this is the best route, is there any guidance you can provide?
>
> However, I have just seen this post from you that indicates that this error doesn't crop up in Xen 4.10
> https://mail.coreboot.org/pipermail/coreboot/2017-November/085542.html
>
> Is it straightforward to configure an install of Qubes 4 with Xen 4.10?
>
> Kind regards,
>
> Pete
>
> Sent with ProtonMail Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Friday, November 30, 2018 10:09 PM, Taiidan at gmx.com Taiidan at gmx.com wrote:
>
> > Oops sorry forgot I also need "sudo xl dmesg" from dom0!
> >
> > coreboot mailing list: coreboot at coreboot.org
> > https://mail.coreboot.org/mailman/listinfo/coreboot
>
> --
>
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