unable to have a working radeon kms framebuffer with linux-3.2.2 on ppc video card: Radeon 9250 PCI

here the boot log:

U-Boot 2010.06.05 (Jul 05 2011 - 17:53:34)

CPU: AMCC PowerPC 460EX Rev. B at 1166.667 MHz (PLB=233 OPB=116 EBC=116) No Security/Kasumi support Bootstrap Option H - Boot ROM Location I2C (Addr 0x52) Internal PCI arbiter enabled 32 kB I-Cache 32 kB D-Cache Board: Sam460ex, PCIe 4x + SATA-2 I2C: ready DRAM: 2 GiB (ECC not enabled, 466 MHz, CL4) PCI: Bus Dev VenId DevId Class Int 00 04 1002 5960 0300 ff 00 04 1002 5940 0380 ff 00 06 126f 0501 0380 00 PCIE1: link is not up. Net: ppc_4xx_eth0 FPGA: Revision 03 (2010-10-07) SM502: found VGA: 1 VESA: OK Using Canyonlands machine description Cannot reserve gpages without hugetlb enabled Initializing cgroup subsys cpu Linux version 3.2.2 (root@sam460) (gcc version 4.5.3 (CRUX PPC) ) #3 Fri Feb 3 0 2:20:16 CET 2012 Zone PFN ranges: DMA 0x00000000 -> 0x00030000 Normal empty HighMem 0x00030000 -> 0x00080000 Movable zone start PFN for each node early_node_map[1] active PFN ranges 0: 0x00000000 -> 0x00080000 MMU: Allocated 1088 bytes of context maps for 255 contexts Built 1 zonelists in Zone order, mobility grouping on. Total pages: 520192 Kernel command line: root=/dev/sda3 ro video=800x600 console=tty0 console=ttyS0, 115200 udbg-immortal PID hash table entries: 4096 (order: 2, 16384 bytes) Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 2072768k/2097152k available (6732k kernel code, 24384k reserved, 196k da ta, 141k bss, 200k init) Kernel virtual memory layout: * 0xfffcf000..0xfffff000 : fixmap * 0xffc00000..0xffe00000 : highmem PTEs * 0xffa00000..0xffc00000 : consistent mem * 0xffa00000..0xffa00000 : early ioremap * 0xf1000000..0xffa00000 : vmalloc & ioremap SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 NR_IRQS:512 nr_irqs:512 16 UIC0 (32 IRQ sources) at DCR 0xc0 UIC1 (32 IRQ sources) at DCR 0xd0 UIC2 (32 IRQ sources) at DCR 0xe0 UIC3 (32 IRQ sources) at DCR 0xf0 clocksource: timebase mult[36db6e] shift[22] registered Console: colour dummy device 80x25 console [tty0] enabled pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 512 devtmpfs: initialized NET: Registered protocol family 16 256k L2-cache enabled PCIE0: Port disabled via device-tree PCIE1: Checking link... PCIE1: No device detected. PCI host bridge /plb/pciex@d20000000 (primary) ranges: MEM 0x0000000e80000000..0x0000000effffffff -> 0x0000000080000000 MEM 0x0000000f00100000..0x0000000f001fffff -> 0x0000000000000000 IO 0x0000000f80010000..0x0000000f8001ffff -> 0x0000000000000000 Removing ISA hole at 0x0000000f00100000 4xx PCI DMA offset set to 0x00000000 /plb/pciex@d20000000: Legacy ISA memory support enabled PCIE1: successfully set as root-complex PCI host bridge /plb/pci@c0ec00000 (primary) ranges: MEM 0x0000000d80000000..0x0000000dffffffff -> 0x0000000080000000 MEM 0x0000000c0ee00000..0x0000000c0eefffff -> 0x0000000000000000 IO 0x0000000c08000000..0x0000000c0800ffff -> 0x0000000000000000 Removing ISA hole at 0x0000000c0ee00000 4xx PCI DMA offset set to 0x00000000 /plb/pci@c0ec00000: Legacy ISA memory support enabled PCI: Probing PCI hardware PCI: Hiding 4xx host bridge resources 0000:80:00.0 pci 0000:80:00.0: PCI bridge to [bus 81-bf] pci 0000:80:00.0: PCI bridge to [bus 81-bf] pci 0001:00:04.0: BAR 0: assigned [mem 0xd80000000-0xd87ffffff pref] pci 0001:00:04.0: BAR 0: set to [mem 0xd80000000-0xd87ffffff pref] (PCI address [0x80000000-0x87ffffff]) pci 0001:00:04.1: BAR 0: assigned [mem 0xd88000000-0xd8fffffff pref] pci 0001:00:04.1: BAR 0: set to [mem 0xd88000000-0xd8fffffff pref] (PCI address [0x88000000-0x8fffffff]) pci 0001:00:06.0: BAR 0: assigned [mem 0xd90000000-0xd93ffffff] pci 0001:00:06.0: BAR 0: set to [mem 0xd90000000-0xd93ffffff] (PCI address [0x90 000000-0x93ffffff]) pci 0001:00:06.0: BAR 1: assigned [mem 0xd94000000-0xd941fffff] pci 0001:00:06.0: BAR 1: set to [mem 0xd94000000-0xd941fffff] (PCI address [0x94 000000-0x941fffff]) pci 0001:00:04.0: BAR 6: assigned [mem 0xd94200000-0xd9421ffff pref] pci 0001:00:04.0: BAR 2: assigned [mem 0xd94220000-0xd9422ffff] pci 0001:00:04.0: BAR 2: set to [mem 0xd94220000-0xd9422ffff] (PCI address [0x94 220000-0x9422ffff]) pci 0001:00:04.1: BAR 1: assigned [mem 0xd94230000-0xd9423ffff] pci 0001:00:04.1: BAR 1: set to [mem 0xd94230000-0xd9423ffff] (PCI address [0x94 230000-0x9423ffff]) pci 0001:00:04.0: BAR 1: assigned [io 0x1000-0x10ff] pci 0001:00:04.0: BAR 1: set to [io 0x1000-0x10ff] (PCI address [0x1000-0x10ff] ) bio: create slab <bio-0> at 0 vgaarb: device added: PCI:0001:00:04.0,decodes=io+mem,owns=io+mem,locks=none vgaarb: loaded vgaarb: bridge control possible 0001:00:04.0 SCSI subsystem initialized usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb Switching to clocksource timebase NET: Registered protocol family 2 IP route cache hash table entries: 32768 (order: 5, 131072 bytes) TCP established hash table entries: 131072 (order: 8, 1048576 bytes) TCP bind hash table entries: 65536 (order: 6, 262144 bytes) TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered UDP hash table entries: 512 (order: 1, 8192 bytes) UDP-Lite hash table entries: 512 (order: 1, 8192 bytes) NET: Registered protocol family 1 RPC: Registered named UNIX socket transport module. RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp NFSv4.1 backchannel transport module. Could not remap bcsr setting trigger mode 3 for irq 43 failed (uic_set_irq_type+0x0/0x164) setting trigger mode 3 for irq 43 failed (uic_set_irq_type+0x0/0x164) highmem bounce pool size: 64 pages JFS: nTxBlock = 8192, nTxLock = 65536 SGI XFS with ACLs, security attributes, large block/inode numbers, no debug enab led Btrfs loaded msgmni has been set to 1488 Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) io scheduler noop registered io scheduler cfq registered (default) Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled serial8250.0: ttyS0 at MMIO 0x4ef600300 (irq = 20) is a U6_16550A console [ttyS0] enabled serial8250.0: ttyS1 at MMIO 0x4ef600400 (irq = 21) is a U6_16550A 4ef600300.serial: ttyS0 at MMIO 0x4ef600300 (irq = 20) is a 16550 4ef600400.serial: ttyS1 at MMIO 0x4ef600400 (irq = 21) is a 16550 Generic non-volatile memory driver v1.1 [drm] Initialized drm 1.1.0 20060810 [drm] radeon defaulting to kernel modesetting. [drm] radeon kernel modesetting enabled. [drm] initializing kernel modesetting (RV280 0x1002:0x5960 0x174B:0x0250). [drm] register mmio base: 0x94220000 [drm] register mmio size: 65536 [drm] Generation 2 PCI interface, using max accessible memory radeon 0001:00:04.0: VRAM: 128M 0x0000000D80000000 - 0x0000000D87FFFFFF (128M us ed) radeon 0001:00:04.0: GTT: 512M 0x0000000D88000000 - 0x0000000DA7FFFFFF [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [drm] Driver supports precise vblank timestamp query. [drm] radeon: irq initialized. [drm] Detected VRAM RAM=128M, BAR=128M [drm] RAM width 64bits DDR [TTM] Zone kernel: Available graphics memory: 381024 kiB. [TTM] Zone highmem: Available graphics memory: 1036384 kiB. [TTM] Initializing pool allocator. [drm] radeon: 128M of VRAM memory ready [drm] radeon: 512M of GTT memory ready. [drm] GART: num cpu pages 131072, num gpu pages 131072 [drm] PCIE GART of 512M enabled (table at 0x000000002F200000). radeon 0001:00:04.0: WB disabled [drm] Loading R200 Microcode radeon_cp: Failed to load firmware "radeon/R200_cp.bin" [drm:r100_cp_init] *ERROR* Failed to load firmware! radeon 0001:00:04.0: failed initializing CP (-2). radeon 0001:00:04.0: Disabling GPU acceleration [drm] radeon: cp finalized [drm] Radeon Display Connectors [drm] Connector 0: [drm] VGA [drm] DDC: 0x60 0x60 0x60 0x60 0x60 0x60 0x60 0x60 [drm] Encoders: [drm] CRT1: INTERNAL_DAC1 [drm] Connector 1: [drm] DVI-I [drm] HPD1 [drm] DDC: 0x64 0x64 0x64 0x64 0x64 0x64 0x64 0x64 [drm] Encoders: [drm] CRT2: INTERNAL_DAC2 [drm] DFP1: INTERNAL_TMDS1 No connectors reported connected with modes [drm] Cannot find any crtc or sizes - going 1024x768 Machine check in kernel mode. Data Write PLB Error Machine Check exception is imprecise Oops: Machine check, sig: 7 [#1] Canyonlands Modules linked in: NIP: c000a5d0 LR: c038f4d8 CTR: 000bfffb REGS: efff7f10 TRAP: 0214 Not tainted (3.2.2) MSR: 00029000 <EE,ME,CE> CR: 247f4e24 XER: 00000000 TASK = ef830000[1] 'swapper' THREAD: ef834000 GPR00: 00000000 ef835c60 ef830000 f5500000 00000000 00300000 ef835c08 00000000 GPR08: ef835b68 f5500014 00000000 000c0001 247f4e84 8400682f ef024400 ef013ee0 GPR16: 00000020 c05f0000 c060700d 00000000 ef835d08 c0606d80 c0564bc0 c060702f GPR24: fffffff4 ef016d30 ef8c657c ef016c00 ef024800 ef835cb8 ef80d000 ef8c6500 NIP [c000a5d0] _memset_io+0x54/0x90 LR [c038f4d8] radeon_fb_find_or_create_single+0x21c/0x3f8 Call Trace: [ef835c60] [c038f4bc] radeon_fb_find_or_create_single+0x200/0x3f8 (unreliable) [ef835cb0] [c0337b88] drm_fb_helper_single_fb_probe+0x1e8/0x2dc [ef835cf0] [c0337e44] drm_fb_helper_initial_config+0x1c8/0x1dc [ef835d70] [c038f81c] radeon_fbdev_init+0xd4/0xe0 [ef835d90] [c038b89c] radeon_modeset_init+0x7dc/0x7f0 [ef835df0] [c037063c] radeon_driver_load_kms+0xd4/0x104 [ef835e10] [c0343778] drm_get_pci_dev+0x148/0x218 [ef835e30] [c0541904] radeon_pci_probe+0xd4/0xdc [ef835e50] [c02f32c4] local_pci_probe+0x5c/0xac [ef835e70] [c02f387c] pci_device_probe+0x68/0x94 [ef835ea0] [c03cc330] driver_probe_device+0xe4/0x198 [ef835ec0] [c03cc454] __driver_attach+0x70/0x98 [ef835ee0] [c03cb3cc] bus_for_each_dev+0x60/0x90 [ef835f10] [c03cbf88] driver_attach+0x24/0x34 [ef835f20] [c03cbb54] bus_add_driver+0xbc/0x23c [ef835f40] [c03cca6c] driver_register+0xb8/0x144 [ef835f60] [c02f3ab4] __pci_register_driver+0x4c/0xc8 [ef835f80] [c03438c4] drm_pci_init+0x7c/0xf8 [ef835fa0] [c067aa88] radeon_init+0xc8/0xd0 [ef835fb0] [c0001608] do_one_initcall+0xe0/0x1b8 [ef835fe0] [c0661798] kernel_init+0x88/0x120 [ef835ff0] [c000b140] kernel_thread+0x4c/0x68 Instruction dump: 99230000 38a5ffff 38630001 42000018 54abf0be 7c691b78 396b0001 7d6903a6 48000018 706b0003 4082ffd8 4bffffe4 39290004 4200fff8 54a907be ---[ end trace a97f9099d7d670b8 ]--- Kernel panic - not syncing: Attempted to kill init! Call Trace: Rebooting in 180 seconds..