Message-ID: <CY4PR10MB13029B38D31936622E4CA62389FA0@CY4PR10MB1302.namprd10.prod.outlook.com>
Date:   Wed, 25 Nov 2020 09:16:07 +0000
From:   "Merger, Edgar [AUTOSOL/MAS/AUGS]" <Edgar.Merger@...rson.com>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Huang, Ray" <Ray.Huang@....com>,
        "Kuehling, Felix" <Felix.Kuehling@....com>
CC:     Will Deacon <will@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Joerg Roedel <jroedel@...e.de>,
        "Zhu, Changfeng" <Changfeng.Zhu@....com>
Subject: RE: [EXTERNAL] Re: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken

Remark: 

Systems with R1305G APU (which show the issue) have the following VGA-Controller:
0b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev cf)

Systems with V1404I APU (which do not show the issue) have the following VGA-Controller:
0b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] (rev 83)

"rev cf" vs. "ref 83" is probably what you where referring to with PCI Revision ID.

-----Original Message-----
From: Merger, Edgar [AUTOSOL/MAS/AUGS] 
Sent: Mittwoch, 25. November 2020 07:05
To: 'Deucher, Alexander' <Alexander.Deucher@....com>; Huang, Ray <Ray.Huang@....com>; Kuehling, Felix <Felix.Kuehling@....com>
Cc: Will Deacon <will@...nel.org>; linux-kernel@...r.kernel.org; linux-pci@...r.kernel.org; iommu@...ts.linux-foundation.org; Bjorn Helgaas <bhelgaas@...gle.com>; Joerg Roedel <jroedel@...e.de>; Zhu, Changfeng <Changfeng.Zhu@....com>
Subject: RE: [EXTERNAL] Re: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken

I see that problem only on systems that use a R1305G APU

sudo cat /sys/kernel/debug/dri/0/amdgpu_firmware_info

shows

VCE feature version: 0, firmware version: 0x00000000 UVD feature version: 0, firmware version: 0x00000000 MC feature version: 0, firmware version: 0x00000000 ME feature version: 50, firmware version: 0x000000a3 PFP feature version: 50, firmware version: 0x000000bb CE feature version: 50, firmware version: 0x0000004f RLC feature version: 1, firmware version: 0x00000049 RLC SRLC feature version: 1, firmware version: 0x00000001 RLC SRLG feature version: 1, firmware version: 0x00000001 RLC SRLS feature version: 1, firmware version: 0x00000001 MEC feature version: 50, firmware version: 0x000001b5
MEC2 feature version: 50, firmware version: 0x000001b5 SOS feature version: 0, firmware version: 0x00000000 ASD feature version: 0, firmware version: 0x21000030 TA XGMI feature version: 0, firmware version: 0x00000000 TA RAS feature version: 0, firmware version: 0x00000000 SMC feature version: 0, firmware version: 0x00002527
SDMA0 feature version: 41, firmware version: 0x000000a9 VCN feature version: 0, firmware version: 0x0110901c DMCU feature version: 0, firmware version: 0x00000001 VBIOS version: 113-RAVEN2-117

We are also using V1404I APU on the same boards and I haven´t seen the issue on those boards

These boards give me slightly different info: sudo cat /sys/kernel/debug/dri/0/amdgpu_firmware_info
 
VCE feature version: 0, firmware version: 0x00000000 UVD feature version: 0, firmware version: 0x00000000 MC feature version: 0, firmware version: 0x00000000 ME feature version: 47, firmware version: 0x000000a2 PFP feature version: 47, firmware version: 0x000000b9 CE feature version: 47, firmware version: 0x0000004e RLC feature version: 1, firmware version: 0x00000213 RLC SRLC feature version: 1, firmware version: 0x00000001 RLC SRLG feature version: 1, firmware version: 0x00000001 RLC SRLS feature version: 1, firmware version: 0x00000001 MEC feature version: 47, firmware version: 0x000001ab
MEC2 feature version: 47, firmware version: 0x000001ab SOS feature version: 0, firmware version: 0x00000000 ASD feature version: 0, firmware version: 0x21000013 TA XGMI feature version: 0, firmware version: 0x00000000 TA RAS feature version: 0, firmware version: 0x00000000 SMC feature version: 0, firmware version: 0x00001e5b
SDMA0 feature version: 41, firmware version: 0x000000a9 VCN feature version: 0, firmware version: 0x0110901c DMCU feature version: 0, firmware version: 0x00000000 VBIOS version: 113-RAVEN-116




00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 PCIe GPP Bridge [6:0]
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Zeppelin Switch Upstream (PCIE SW.US)
00:01.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 PCIe GPP Bridge [6:0]
00:01.5 PCI bridge: Advanced Micro Devices, Inc. [AMD] Zeppelin Switch Upstream (PCIE SW.US)
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Internal PCIe GPP Bridge 0 to Bus A
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Internal PCIe GPP Bridge 0 to Bus B
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Device 24: Function 7
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0e)
01:00.1 Serial controller: Realtek Semiconductor Co., Ltd. Device 816a (rev 0e)
01:00.2 Serial controller: Realtek Semiconductor Co., Ltd. Device 816b (rev 0e)
01:00.3 IPMI Interface: Realtek Semiconductor Co., Ltd. Device 816c (rev 0e)
01:00.4 USB controller: Realtek Semiconductor Co., Ltd. Device 816d (rev 0e)
02:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
03:00.0 PCI bridge: Pericom Semiconductor PI7C9X2G608GP PCIe2 6-Port/8-Lane Packet Switch
04:01.0 PCI bridge: Pericom Semiconductor PI7C9X2G608GP PCIe2 6-Port/8-Lane Packet Switch
04:02.0 PCI bridge: Pericom Semiconductor PI7C9X2G608GP PCIe2 6-Port/8-Lane Packet Switch
04:03.0 PCI bridge: Pericom Semiconductor PI7C9X2G608GP PCIe2 6-Port/8-Lane Packet Switch
04:04.0 PCI bridge: Pericom Semiconductor PI7C9X2G608GP PCIe2 6-Port/8-Lane Packet Switch
04:05.0 PCI bridge: Pericom Semiconductor PI7C9X2G608GP PCIe2 6-Port/8-Lane Packet Switch
06:00.0 Serial controller: Asix Electronics Corporation Device 9100
06:00.1 Serial controller: Asix Electronics Corporation Device 9100
07:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
0a:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
0b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev cf)
0b:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio Controller
0b:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor
0b:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Raven2 USB 3.1
0b:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor
0b:00.7 Non-VGA unclassified device: Advanced Micro Devices, Inc. [AMD] Raven/Raven2/Renoir Non-Sensor Fusion Hub KMDF driver
0c:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 61)

PCI Revision ID is 06 I believe. Got that from this lspci -xx

00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Zeppelin Switch Upstream (PCIE SW.US)
00: 22 10 5d 14 07 04 10 00 00 00 04 06 10 00 81 00
10: 00 00 00 00 00 00 00 00 00 02 02 00 f1 01 00 00
20: e0 fc e0 fc f1 ff 01 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 50 00 00 00 00 00 00 00 ff 00 12 00
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50: 01 58 03 c8 00 00 00 00 10 a0 42 01 22 80 00 00
60: 1f 29 00 00 13 38 73 03 42 00 11 30 00 00 04 00
70: 00 00 40 01 18 00 01 00 00 00 00 00 bf 01 70 00
80: 06 00 00 00 0e 00 00 00 03 00 01 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 05 c0 81 00 00 00 e0 fe 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 0d c8 00 00 22 10 34 12 08 00 03 a8 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 4c 8a 05 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

-----Original Message-----
From: Deucher, Alexander <Alexander.Deucher@....com>
Sent: Dienstag, 24. November 2020 16:06
To: Merger, Edgar [AUTOSOL/MAS/AUGS] <Edgar.Merger@...rson.com>; Huang, Ray <Ray.Huang@....com>; Kuehling, Felix <Felix.Kuehling@....com>
Cc: Will Deacon <will@...nel.org>; linux-kernel@...r.kernel.org; linux-pci@...r.kernel.org; iommu@...ts.linux-foundation.org; Bjorn Helgaas <bhelgaas@...gle.com>; Joerg Roedel <jroedel@...e.de>; Zhu, Changfeng <Changfeng.Zhu@....com>
Subject: RE: [EXTERNAL] Re: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken

[AMD Public Use]

> -----Original Message-----
> From: Merger, Edgar [AUTOSOL/MAS/AUGS] <Edgar.Merger@...rson.com>
> Sent: Tuesday, November 24, 2020 2:29 AM
> To: Huang, Ray <Ray.Huang@....com>; Kuehling, Felix 
> <Felix.Kuehling@....com>
> Cc: Will Deacon <will@...nel.org>; Deucher, Alexander 
> <Alexander.Deucher@....com>; linux-kernel@...r.kernel.org; linux- 
> pci@...r.kernel.org; iommu@...ts.linux-foundation.org; Bjorn Helgaas 
> <bhelgaas@...gle.com>; Joerg Roedel <jroedel@...e.de>; Zhu, Changfeng 
> <Changfeng.Zhu@....com>
> Subject: RE: [EXTERNAL] Re: [PATCH] PCI: Mark AMD Raven iGPU ATS as 
> broken
> 
> Module Version : PiccasoCpu 10
> AGESA Version   : PiccasoPI 100A
> 
> I did not try to enter the system in any other way (like via ssh) than 
> via Desktop.

You can get this information from the amdgpu driver.  E.g., sudo cat /sys/kernel/debug/dri/0/amdgpu_firmware_info .  Also what is the PCI revision id of your chip (from lspci)?  Also are you just seeing this on specific versions of the sbios?

Thanks,

Alex


> 
> -----Original Message-----
> From: Huang Rui <ray.huang@....com>
> Sent: Dienstag, 24. November 2020 07:43
> To: Kuehling, Felix <Felix.Kuehling@....com>
> Cc: Will Deacon <will@...nel.org>; Deucher, Alexander 
> <Alexander.Deucher@....com>; linux-kernel@...r.kernel.org; linux- 
> pci@...r.kernel.org; iommu@...ts.linux-foundation.org; Bjorn Helgaas 
> <bhelgaas@...gle.com>; Merger, Edgar [AUTOSOL/MAS/AUGS] 
> <Edgar.Merger@...rson.com>; Joerg Roedel <jroedel@...e.de>; Changfeng 
> Zhu <changfeng.zhu@....com>
> Subject: [EXTERNAL] Re: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken
> 
> On Tue, Nov 24, 2020 at 06:51:11AM +0800, Kuehling, Felix wrote:
> > On 2020-11-23 5:33 p.m., Will Deacon wrote:
> > > On Mon, Nov 23, 2020 at 09:04:14PM +0000, Deucher, Alexander wrote:
> > >> [AMD Public Use]
> > >>
> > >>> -----Original Message-----
> > >>> From: Will Deacon <will@...nel.org>
> > >>> Sent: Monday, November 23, 2020 8:44 AM
> > >>> To: linux-kernel@...r.kernel.org
> > >>> Cc: linux-pci@...r.kernel.org; iommu@...ts.linux-foundation.org; 
> > >>> Will Deacon <will@...nel.org>; Bjorn Helgaas 
> > >>> <bhelgaas@...gle.com>; Deucher, Alexander 
> > >>> <Alexander.Deucher@....com>; Edgar Merger 
> > >>> <Edgar.Merger@...rson.com>; Joerg Roedel <jroedel@...e.de>
> > >>> Subject: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken
> > >>>
> > >>> Edgar Merger reports that the AMD Raven GPU does not work 
> > >>> reliably on his system when the IOMMU is enabled:
> > >>>
> > >>>    | [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx 
> > >>> timeout, signaled seq=1, emitted seq=3
> > >>>    | [...]
> > >>>    | amdgpu 0000:0b:00.0: GPU reset begin!
> > >>>    | AMD-Vi: Completion-Wait loop timed out
> > >>>    | iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT
> > >>> device=0b:00.0 address=0x38edc0970]
> > >>>
> > >>> This is indicative of a hardware/platform configuration issue 
> > >>> so, since disabling ATS has been shown to resolve the problem, 
> > >>> add a quirk to match this particular device while Edgar 
> > >>> follows-up with AMD
> for more information.
> > >>>
> > >>> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > >>> Cc: Alex Deucher <alexander.deucher@....com>
> > >>> Reported-by: Edgar Merger <Edgar.Merger@...rson.com>
> > >>> Suggested-by: Joerg Roedel <jroedel@...e.de>
> > >>> Link:
> > >>>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__nam11.safelinks.p
> rotection.outlook.com_-3Furl-3Dhttps-253A-252F-252Furld&d=DwIFAw&c=jOU
> RTkCZzT8tVB5xPEYIm3YJGoxoTaQsQPzPKJGaWbo&r=BJxhacqqa4K1PJGm6_-862rdSP1
> 3_P6LVp7j_9l1xmg&m=MMI_EgCqeOX4EvIftpL7agRxJ-udp1CLokf2QWuzFgE&s=ZLdz6
> OgavzNn2vSzsgyL1IB6MbK7hPKavOYwbLhyTPU&e=
> efense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-
> 3A__lore%26d%3DDwIDAw%26c%3DjOURTkCZzT8tVB5xPEYIm3YJGoxoTaQs
> QPzPKJGaWbo%26r%3DBJxhacqqa4K1PJGm6_-
> 862rdSP13_P6LVp7j_9l1xmg%26m%3DlNXu2xwvyxEZ3PzoVmXMBXXS55jsmf
> DicuQFJqkIOH4%26s%3D_5VDNCRQdA7AhsvvZ3TJJtQZ2iBp9c9tFHIleTYT_ZM
> %26e%3D&amp;data=04%7C01%7CAlexander.Deucher%40amd.com%7C6d5f
> a241f9634692c03908d8904a942c%7C3dd8961fe4884e608e11a82d994e183d%7
> C0%7C0%7C637417997272974427%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi
> MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C100
> 0&amp;sdata=OEgYlw%2F1YP0C%2FnWBRQUxwBH56mGOJxYMWSQ%2Fj1Y
> 9f6Q%3D&amp;reserved=0 .
> > >>> kernel.org/linux-
> > >>>
> iommu/MWHPR10MB1310F042A30661D4158520B589FC0@...PR10M
> > >>> B1310.namprd10.prod.outlook.com
> > >>>
> her%40amd.com%7C1a883fe14d0c408e7d9508d88fb5df4e%7C3dd8961fe488
> > >>>
> 4e608e11a82d994e183d%7C0%7C0%7C637417358593629699%7CUnknown%7
> > >>>
> CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwi
> > >>>
> LCJXVCI6Mn0%3D%7C1000&amp;sdata=TMgKldWzsX8XZ0l7q3%2BszDWXQJJ
> > >>> LOUfX5oGaoLN8n%2B8%3D&amp;reserved=0
> > >>> Signed-off-by: Will Deacon <will@...nel.org>
> > >>> ---
> > >>>
> > >>> Hi all,
> > >>>
> > >>> Since Joerg is away at the moment, I'm posting this to try to 
> > >>> make some progress with the thread in the Link: tag.
> > >> + Felix
> > >>
> > >> What system is this?  Can you provide more details?  Does a sbios 
> > >> update fix this?  Disabling ATS for all Ravens will break GPU 
> > >> compute for a lot of people.  I'd prefer to just black list this 
> > >> particular system (e.g., just SSIDs or revision) if possible.
> >
> > +Ray
> >
> > There are already many systems where the IOMMU is disabled in the 
> > BIOS, or the CRAT table reporting the APU compute capabilities is 
> > broken. Ray has been working on a fallback to make APUs behave like 
> > dGPUs on such systems. That should also cover this case where ATS is 
> > blacklisted. That said, it affects the programming model, because we 
> > don't support the unified and coherent memory model on dGPUs like we 
> > do on APUs with IOMMUv2. So it would be good to make the conditions 
> > for this workaround as narrow as possible.
> 
> Yes, besides the comments from Alex and Felix, may we get your 
> firmware version (SMC firmware which is from SBIOS) and device id?
> 
> > >>>    | [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx 
> > >>> timeout, signaled seq=1, emitted seq=3
> 
> It looks only gfx ib test passed, and fails to lanuch desktop, am I right?
> 
> We would like to see whether it is Raven, Raven kicker (new Raven), or 
> Picasso. In our side, per the internal test result, we didn't see the 
> similiar issue on Raven kicker and Picasso platform.
> 
> Thanks,
> Ray
> 
> >
> > These are the relevant changes in KFD and Thunk for reference:
> >
> > ### KFD ###
> >
> > commit 914913ab04dfbcd0226ecb6bc99d276832ea2908
> > Author: Huang Rui <ray.huang@....com>
> > Date:   Tue Aug 18 14:54:23 2020 +0800
> >
> >      drm/amdkfd: implement the dGPU fallback path for apu (v6)
> >
> >      We still have a few iommu issues which need to address, so 
> > force raven
> >      as "dgpu" path for the moment.
> >
> >      This is to add the fallback path to bypass IOMMU if IOMMU v2 is 
> > disabled
> >      or ACPI CRAT table not correct.
> >
> >      v2: Use ignore_crat parameter to decide whether it will go with 
> > IOMMUv2.
> >      v3: Align with existed thunk, don't change the way of raven, 
> > only renoir
> >          will use "dgpu" path by default.
> >      v4: don't update global ignore_crat in the driver, and revise 
> > fallback
> >          function if CRAT is broken.
> >      v5: refine acpi crat good but no iommu support case, and rename 
> > the
> >          title.
> >      v6: fix the issue of dGPU initialized firstly, just modify the 
> > report
> >          value in the node_show().
> >
> >      Signed-off-by: Huang Rui <ray.huang@....com>
> >      Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
> >      Signed-off-by: Alex Deucher <alexander.deucher@....com>
> >
> > ### Thunk ###
> >
> > commit e32482fa4b9ca398c8bdc303920abfd672592764
> > Author: Huang Rui <ray.huang@....com>
> > Date:   Tue Aug 18 18:54:05 2020 +0800
> >
> >      libhsakmt: remove is_dgpu flag in the hsa_gfxip_table
> >
> >      Whether use dgpu path will check the props which exposed from kernel.
> >      We won't need hard code in the ASIC table.
> >
> >      Signed-off-by: Huang Rui <ray.huang@....com>
> >      Change-Id: I0c018a26b219914a41197ff36dbec7a75945d452
> >
> > commit 7c60f6d912034aa67ed27b47a29221422423f5cc
> > Author: Huang Rui <ray.huang@....com>
> > Date:   Thu Jul 30 10:22:23 2020 +0800
> >
> >      libhsakmt: implement the method that using flag which exposed 
> > by kfd to configure is_dgpu
> >
> >      KFD already implemented the fallback path for APU. Thunk will 
> > use flag
> >      which exposed by kfd to configure is_dgpu instead of hardcode before.
> >
> >      Signed-off-by: Huang Rui <ray.huang@....com>
> >      Change-Id: I445f6cf668f9484dd06cd9ae1bb3cfe7428ec7eb
> >
> > Regards,
> >    Felix
> >
> >
> > > Cheers, Alex. I'll have to defer to Edgar for the details, as my 
> > > understanding from the original thread over at:
> > >
> > >
> https://urldefense.proofpoint.com/v2/url?u=https-3A__nam11.safelinks.p
> rotection.outlook.com_-3Furl-3Dhttps-253A-252F-252Fur&d=DwIFAw&c=jOURT
> kCZzT8tVB5xPEYIm3YJGoxoTaQsQPzPKJGaWbo&r=BJxhacqqa4K1PJGm6_-862rdSP13_
> P6LVp7j_9l1xmg&m=MMI_EgCqeOX4EvIftpL7agRxJ-udp1CLokf2QWuzFgE&s=IPZRolk
> y3TYlbWPsOkY37MbDdzwhc1b_LaE6JkaOkOo&e=
> > > ldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttps-
> 3A__lore.kernel.org&a
> > >
> mp;data=04%7C01%7CAlexander.Deucher%40amd.com%7C6d5fa241f963469
> 2c039
> > >
> 08d8904a942c%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C63741
> 79972
> > >
> 72974427%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoi
> V2luMzI
> > >
> iLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=iKTPucGQqcRXET
> QZiQz
> > > j90WdJeCYDytdZHJ1ZiUyR%2FM%3D&amp;reserved=0
> > > _linux-2Diommu_MWHPR10MB1310CDB6829DDCF5EA84A14689150-
> 40MWHPR10MB131
> > >
> 0.namprd10.prod.outlook.com_&d=DwIDAw&c=jOURTkCZzT8tVB5xPEYIm3Y
> JGoxo
> > > TaQsQPzPKJGaWbo&r=BJxhacqqa4K1PJGm6_-
> 862rdSP13_P6LVp7j_9l1xmg&m=lNXu
> > >
> 2xwvyxEZ3PzoVmXMBXXS55jsmfDicuQFJqkIOH4&s=dsAVVJbD7gJIj3ctZpnnU
> 60y21
> > > ijWZmZ8xmOK1cO_O0&e=
> > >
> > > is that this is a board developed by his company.
> > >
> > > Edgar -- please can you answer Alex's questions?
> > >
> > > Will

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