Hi Alex,

I've managed to get a little further. I am currently running mainline (5.0.0-rc1) and am getting the errors below.

Looking at the datasheet for the LS1012A, it mentions in the PCI Express section that:

The PCI Express controller as instantiated on this chip does not support hardware coherency. All incoming PCI Express transactions are made non IO-coherent.

Would AMDGPU still work with that PCI Express controller, or is this a show-stopper?

[ 5.727691] [drm] initializing kernel modesetting (POLARIS11 0x1002:0x67E8 0x1DA2:0xE362 0x80).

[ 5.761767] [drm] register mmio base: 0x58000000

[ 5.777272] [drm] register mmio size: 262144

[ 5.825973] [drm] add ip block number 0 <vi_common>

[ 5.832242] [drm] add ip block number 1 <gmc_v8_0>

[ 5.837767] [drm] add ip block number 2 <tonga_ih>

[ 5.843121] [drm] add ip block number 3 <gfx_v8_0>

[ 5.848480] [drm] add ip block number 4 <sdma_v3_0>

[ 5.853969] [drm] add ip block number 5 <powerplay>

[ 5.859413] [drm] add ip block number 6 <dm>

[ 5.864238] [drm] add ip block number 7 <uvd_v6_0>

[ 5.869690] [drm] add ip block number 8 <vce_v3_0>

[ 5.875067] [drm] UVD is enabled in VM mode

[ 5.879858] [drm] UVD ENC is enabled in VM mode

[ 5.884985] [drm] VCE enabled in VM mode

[ 6.114020] ATOM BIOS: 113-C98511-U01

[ 6.117757] [drm] GPU posting now...

[ 6.238112] [drm] vm size is 64 GB, 2 levels, block size is 10-bit, fragment size is 9-bit

[ 6.247290] amdgpu 0000:01:00.0: BAR 2: releasing [mem 0x4050000000-0x40501fffff 64bit pref]

[ 6.257354] amdgpu 0000:01:00.0: BAR 0: releasing [mem 0x4040000000-0x404fffffff 64bit pref]

[ 6.267261] pcieport 0000:00:00.0: BAR 15: releasing [mem 0x4040000000-0x4057ffffff 64bit pref]

[ 6.277288] pcieport 0000:00:00.0: BAR 15: no space for [mem size 0x300000000 64bit pref]

[ 6.286843] pcieport 0000:00:00.0: BAR 15: failed to assign [mem size 0x300000000 64bit pref]

[ 6.296708] amdgpu 0000:01:00.0: BAR 0: no space for [mem size 0x200000000 64bit pref]

[ 6.306009] amdgpu 0000:01:00.0: BAR 0: failed to assign [mem size 0x200000000 64bit pref]

[ 6.315635] amdgpu 0000:01:00.0: BAR 2: no space for [mem size 0x00200000 64bit pref]

[ 6.324804] amdgpu 0000:01:00.0: BAR 2: failed to assign [mem size 0x00200000 64bit pref]

[ 6.334366] pcieport 0000:00:00.0: PCI bridge to [bus 01-ff]

[ 6.341323] pcieport 0000:00:00.0: bridge window [io 0x1000-0x1fff]

[ 6.349158] pcieport 0000:00:00.0: bridge window [mem 0x4058000000-0x40580fffff]

[ 6.358095] pcieport 0000:00:00.0: PCI bridge to [bus 01-ff]

[ 6.365054] pcieport 0000:00:00.0: bridge window [io 0x1000-0x1fff]

[ 6.372981] pcieport 0000:00:00.0: bridge window [mem 0x4058000000-0x40580fffff]

[ 6.381917] pcieport 0000:00:00.0: bridge window [mem 0x4040000000-0x4057ffffff 64bit pref]

[ 6.391789] [drm] Not enough PCI address space for a large BAR.

[ 6.391820] amdgpu 0000:01:00.0: BAR 0: assigned [mem 0x4040000000-0x404fffffff 64bit pref]

[ 6.407776] amdgpu 0000:01:00.0: BAR 2: assigned [mem 0x4050000000-0x40501fffff 64bit pref]

[ 6.417672] amdgpu 0000:01:00.0: VRAM: 8192M 0x000000F400000000 - 0x000000F5FFFFFFFF (8192M used)

[ 6.426586] amdgpu 0000:01:00.0: GART: 256M 0x000000FF00000000 - 0x000000FF0FFFFFFF

[ 6.436171] [drm] Detected VRAM RAM=8192M, BAR=256M

[ 6.478952] [drm] GART: num cpu pages 65536, num gpu pages 65536

[ 6.487871] [drm] PCIE GART of 256M enabled (table at 0x000000F400000000).

[ 6.496316] amdgpu 0000:01:00.0: Direct firmware load for amdgpu/polaris11_pfp_2.bin failed with error -2

[ 6.508078] amdgpu 0000:01:00.0: Direct firmware load for amdgpu/polaris11_me_2.bin failed with error -2

[ 6.519538] amdgpu 0000:01:00.0: Direct firmware load for amdgpu/polaris11_ce_2.bin failed with error -2

[ 6.531496] amdgpu 0000:01:00.0: Direct firmware load for amdgpu/polaris11_mec_2.bin failed with error -2

[ 6.544214] amdgpu 0000:01:00.0: Direct firmware load for amdgpu/polaris11_mec2_2.bin failed with error -2

[ 6.565121] [drm] Found UVD firmware Version: 1.79 Family ID: 16

[ 6.571241] [drm] UVD ENC is disabled

[ 6.580927] [drm] Found VCE firmware Version: 52.4 Binary ID: 3

[ 6.656854] amdgpu 0000:01:00.0: GPU fault detected: 147 0x00004802 for process pid 0 thread pid 0

[ 6.666013] amdgpu 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x0017F000

[ 6.673508] amdgpu 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x02048002

[ 6.681006] amdgpu 0000:01:00.0: VM fault (0x02, vmid 1, pasid 0) at page 1568768, read from 'TC0' (0x54433000) (72)

[ 6.691557] amdgpu 0000:01:00.0: GPU fault detected: 147 0x00004402 for process pid 0 thread pid 0

[ 6.700706] amdgpu 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x0017F000

[ 6.708200] amdgpu 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x02048002

[ 6.715697] amdgpu 0000:01:00.0: VM fault (0x02, vmid 1, pasid 0) at page 1568768, read from 'TC0' (0x54433000) (72)

[ 6.726246] amdgpu 0000:01:00.0: GPU fault detected: 147 0x00000402 for process pid 0 thread pid 0

[ 6.735395] amdgpu 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x0017F000

[ 6.742889] amdgpu 0000:01:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x02048002

[ 6.750386] amdgpu 0000:01:00.0: VM fault (0x02, vmid 1, pasid 0) at page 1568768, read from 'TC0' (0x54433000) (72)

[ 6.984485] amdgpu 0000:01:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR* ring gfx test failed (-110)

[ 6.994562] [drm:amdgpu_device_init [amdgpu]] *ERROR* hw_init of IP block <gfx_v8_0> failed -110

[ 7.004942] amdgpu 0000:01:00.0: amdgpu_device_ip_init failed

[ 7.011963] amdgpu 0000:01:00.0: Fatal error during GPU init

[ 7.018890] [drm] amdgpu: finishing device.

[ 7.308898] WARNING: CPU: 0 PID: 2084 at /home/bas/linux/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c:915 amdgpu_bo_unpin+0xe4/0x110 [amdgpu]

[ 7.321451] Modules linked in: amdgpu(+) realtek chash gpu_sched ttm drm_kms_helper drm crct10dif_ce drm_panel_orientation_quirks pfe(C) ip_tables x_tables ipv6

[ 7.335850] CPU: 0 PID: 2084 Comm: systemd-udevd Tainted: G C 5.0.0-rc1-00001-g3bd6e94bec12-dirty #1

[ 7.346303] Hardware name: LS1012A RDB Board (DT)

[ 7.351014] pstate: 40000005 (nZcv daif -PAN -UAO)

[ 7.356090] pc : amdgpu_bo_unpin+0xe4/0x110 [amdgpu]

[ 7.361307] lr : amdgpu_bo_free_kernel+0x7c/0x148 [amdgpu]

[ 7.366799] sp : ffff0000118c3730

[ 7.370114] x29: ffff0000118c3730 x28: ffff000008e63710

[ 7.375434] x27: ffff0000118c3df0 x26: 0000000000000100

[ 7.380754] x25: ffff80003599cb60 x24: ffff8000359927d0

[ 7.386073] x23: ffff800035994750 x22: ffff8000359927d0

[ 7.391393] x21: ffff8000358cb800 x20: ffff0000111fd000

[ 7.396713] x19: ffff8000358cb800 x18: 000000000000001e

[ 7.402033] x17: 0000000000000000 x16: 0000000000000002

[ 7.407351] x15: 0000000000000400 x14: 0000000000000400

[ 7.412670] x13: 000000000000cb72 x12: 000000000000b308

[ 7.417989] x11: ffff7e0000d02488 x10: ffff800037798030

[ 7.423308] x9 : ffff0000118c36e4 x8 : 0000000000000000

[ 7.428627] x7 : 0000000000210d00 x6 : 0000000000000000

[ 7.433946] x5 : 0000000000000001 x4 : 0000000000000001

[ 7.439265] x3 : ffff8000358cb87c x2 : 0000000000000000

[ 7.444583] x1 : 0000000000000000 x0 : ffff8000358cb800

[ 7.449903] Call trace:

[ 7.452583] amdgpu_bo_unpin+0xe4/0x110 [amdgpu]

[ 7.457437] amdgpu_bo_free_kernel+0x7c/0x148 [amdgpu]

[ 7.462812] amdgpu_gfx_rlc_fini+0x50/0x78 [amdgpu]

[ 7.467926] gfx_v8_0_sw_fini+0xfc/0x1c0 [amdgpu]

[ 7.472864] amdgpu_device_fini+0x1e0/0x480 [amdgpu]

[ 7.478058] amdgpu_driver_unload_kms+0xa0/0x150 [amdgpu]

[ 7.483686] amdgpu_driver_load_kms+0x144/0x1f8 [amdgpu]

[ 7.489110] drm_dev_register+0x14c/0x1e0 [drm]

[ 7.493906] amdgpu_pci_probe+0xcc/0x188 [amdgpu]

[ 7.498622] local_pci_probe+0x3c/0xb0

[ 7.502375] pci_device_probe+0x150/0x1b8

[ 7.506390] really_probe+0x1f0/0x298

[ 7.510055] driver_probe_device+0x58/0x100

[ 7.514242] __driver_attach+0xd4/0xd8

[ 7.517993] bus_for_each_dev+0x74/0xc8

[ 7.521832] driver_attach+0x20/0x28

[ 7.525410] bus_add_driver+0x1ac/0x218

[ 7.529250] driver_register+0x60/0x110

[ 7.533089] __pci_register_driver+0x40/0x48

[ 7.537599] amdgpu_init+0x58/0x1000 [amdgpu]

[ 7.541964] do_one_initcall+0x5c/0x178

[ 7.545804] do_init_module+0x58/0x1b0

[ 7.549556] load_module+0x1dc8/0x2178

[ 7.553308] __se_sys_finit_module+0xbc/0xd0

[ 7.557582] __arm64_sys_finit_module+0x18/0x20

[ 7.562119] el0_svc_common+0x60/0x100

[ 7.565872] el0_svc_handler+0x2c/0x80

[ 7.581715] amdgpu 0000:01:00.0: (____ptrval____) unpin not necessary

[ 7.594743] [TTM] Finalizing pool allocator

[ 7.599867] [TTM] Finalizing DMA pool allocator

[ 7.605265] [TTM] Zone kernel: Used memory at exit: 0 kiB

[ 7.611482] [drm] amdgpu: ttm finalized

[ 7.618028] amdgpu: probe of 0000:01:00.0 failed with error -110

Bas Vermeulen