Hi there,

I am pretty sure I was able to run kodi on an old Mac Mini G4 (big endian) with AMD RV280. Today it is failing to start with:

[ 162.971551] radeon 0000:00:10.0: ring 0 stalled for more than 10240msec [ 162.971568] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 163.482863] radeon 0000:00:10.0: ring 0 stalled for more than 10752msec [ 163.482880] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 163.994225] radeon 0000:00:10.0: ring 0 stalled for more than 11264msec [ 163.994241] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 164.505598] radeon 0000:00:10.0: ring 0 stalled for more than 11776msec [ 164.505614] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 165.016996] radeon 0000:00:10.0: ring 0 stalled for more than 12288msec [ 165.017013] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 165.528429] radeon 0000:00:10.0: ring 0 stalled for more than 12800msec [ 165.528446] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 166.039865] radeon 0000:00:10.0: ring 0 stalled for more than 13312msec [ 166.039882] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 166.551351] radeon 0000:00:10.0: ring 0 stalled for more than 13824msec [ 166.551368] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 167.062819] radeon 0000:00:10.0: ring 0 stalled for more than 14336msec [ 167.062836] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 167.574331] radeon 0000:00:10.0: ring 0 stalled for more than 14848msec [ 167.574348] radeon 0000:00:10.0: GPU lockup (current fence id 0x00000000000001d6 last fence id 0x00000000000001d7 on ring 0) [ 167.798244] [TTM] Buffer eviction failed [ 167.940488] radeon: wait for empty RBBM fifo failed! Bad things might happen. [ 168.076053] Failed to wait GUI idle while programming pipes. Bad things might happen. [ 168.092258] radeon 0000:00:10.0: Saved 91 dwords of commands on ring 0. [ 168.092380] radeon 0000:00:10.0: (r100_asic_reset:2560) RBBM_STATUS=0x83F96100 [ 168.589895] radeon 0000:00:10.0: (r100_asic_reset:2581) RBBM_STATUS=0x80010140 [ 169.083456] radeon 0000:00:10.0: (r100_asic_reset:2589) RBBM_STATUS=0x00000140 [ 169.083482] radeon 0000:00:10.0: GPU reset succeed [ 169.083487] radeon 0000:00:10.0: GPU reset succeeded, trying to resume [ 169.083550] radeon 0000:00:10.0: WB disabled [ 169.083561] radeon 0000:00:10.0: fence driver on ring 0 use gpu addr 0x0000000000000000 and cpu addr 0x883a5378 [ 169.083612] [drm] radeon: ring at 0x0000000000001000 [ 169.228838] [drm:r100_ring_test [radeon]] *ERROR* radeon: ring test failed (scratch(0x15E8)=0xCAFEDEAD) [ 169.228910] [drm:r100_cp_init [radeon]] *ERROR* radeon: cp isn't working (-22). [ 169.228919] radeon 0000:00:10.0: failed initializing CP (-22).

How should I go and debug this (other than plain git-bisect) ?

For reference:

# modprobe radeon

...

[ 100.369890] [drm] radeon kernel modesetting enabled. [ 100.377816] checking generic (9c008000 5a000) vs hw (98000000 8000000) [ 100.377824] fb: switching to radeondrmfb from OFfb ATY,RockHo [ 100.382566] Console: switching to colour dummy device 80x25 [ 100.386224] radeon 0000:00:10.0: enabling device (0006 -> 0007) [ 100.389596] [drm] initializing kernel modesetting (RV280 0x1002:0x5962 0x1002:0x5962 0x01). [ 100.389783] radeon 0000:00:10.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x0000 [ 100.389813] radeon 0000:00:10.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x0000 [ 100.390218] [drm:radeon_get_bios [radeon]] *ERROR* Unable to locate a BIOS ROM [ 100.390247] [drm] Using device-tree clock info [ 100.390286] agpgart-uninorth 0000:00:0b.0: putting AGP V2 device into 4x mode [ 100.390300] radeon 0000:00:10.0: putting AGP V2 device into 4x mode [ 100.390345] radeon 0000:00:10.0: GTT: 256M 0x00000000 - 0x0FFFFFFF [ 100.390355] [drm] Generation 2 PCI interface, using max accessible memory [ 100.390368] radeon 0000:00:10.0: VRAM: 128M 0x0000000098000000 - 0x000000009FFFFFFF (32M used) [ 100.390406] [drm] Detected VRAM RAM=128M, BAR=128M [ 100.390415] [drm] RAM width 64bits DDR [ 100.405414] [TTM] Zone kernel: Available graphics memory: 254062 kiB [ 100.405444] [TTM] Initializing pool allocator [ 100.405542] [drm] radeon: 32M of VRAM memory ready [ 100.405554] [drm] radeon: 256M of GTT memory ready. [ 100.406161] radeon 0000:00:10.0: WB disabled [ 100.406187] radeon 0000:00:10.0: fence driver on ring 0 use gpu addr 0x0000000000000000 and cpu addr 0x883a5378 [ 100.406204] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 100.406212] [drm] Driver supports precise vblank timestamp query. [ 100.406252] [drm] radeon: irq initialized. [ 100.406276] [drm] Loading R200 Microcode [ 100.446688] radeon 0000:00:10.0: firmware: direct-loading firmware radeon/R200_cp.bin [ 100.447755] [drm] radeon: ring at 0x0000000000001000 [ 100.447800] [drm] ring test succeeded in 0 usecs [ 100.448435] [drm] ib test succeeded in 0 usecs [ 100.454640] [drm] Connector Table: 7 (mini internal tmds) [ 100.454680] [drm] No TMDS info found in BIOS [ 100.454692] [drm] No TV DAC info found in BIOS [ 100.454900] [drm] Radeon Display Connectors [ 100.454910] [drm] Connector 0: [ 100.454916] [drm] DVI-I-1 [ 100.454922] [drm] HPD1 [ 100.454930] [drm] DDC: 0x6c 0x6c 0x6c 0x6c 0x6c 0x6c 0x6c 0x6c [ 100.454937] [drm] Encoders: [ 100.454944] [drm] DFP1: INTERNAL_TMDS1 [ 100.454951] [drm] CRT2: INTERNAL_DAC2 [ 100.454958] [drm] Connector 1: [ 100.454963] [drm] SVIDEO-1 [ 100.454969] [drm] Encoders: [ 100.454975] [drm] TV1: INTERNAL_DAC2 [ 100.542734] [drm] fb mappable at 0x98040000 [ 100.542764] [drm] vram apper at 0x98000000 [ 100.542770] [drm] size 1572864 [ 100.542777] [drm] fb depth is 16 [ 100.542783] [drm] pitch is 2048 [ 100.614204] Console: switching to colour frame buffer device 128x48 [ 100.623505] radeon 0000:00:10.0: fb0: radeondrmfb frame buffer device [ 100.634507] [drm] Initialized radeon 2.50.0 20080528 for 0000:00:10.0 on minor 0

Thanks