Hi,
I tried to use a radeon r200 based graphic card on a sequoia ppc (440epx)
board. I wondered about the initialization of radeonfb that failed with
__ioremap(): phys addr 0x0 is RAM lr c029cf80
radeonfb (0000:00:0a.0): cannot map MMIO
radeonfb: probe of 0000:00:0a.0 failed with error -5
I trigger a check in ioremap, because the address it wants to remap is 0x0
which can never work. The reason of that is that the pci ressource of that
graphic card is not properly detected.
With some help I found two kernels - one that work and one that has this issue.
Unfortunately they are very different:
good => 2.6.24.2 from the linux-2.6-denx - built for arch=ppc
bad => we have 2.6.25-rc9 (used in our kvm ppc project atm) - build for
arch=powerpc
I tried building the 2.6.25-rc9 with arch=ppc, but that one does not boot so
far. Because of that I can't surely tell you if it is only that difference that
breaks the pci detection.
We need arch=powerpc for our kvm code anyway, so I hope there is another
solution than to switch to arch=ppc ;-)
I just started to debug into that, but I wanted to ask here if there might be
some known issues causing that and/or to get some hints where to look at.
The issue is much better visible when I boot with these two kernels and use "lspci
-vvv"
Good kernel:
00:0a.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 PRO]
(rev 01) (prog-if 00 [VGA])
Subsystem: PC Partner Limited Unknown device 0250
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 128 (2000ns min)
Interrupt: pin A routed to IRQ 67
Region 0: Memory at 88000000 (32-bit, prefetchable) [size=128M]
Region 1: I/O ports at ff00 [size=256]
Region 2: Memory at 87ff0000 (32-bit, non-prefetchable) [size=64K]
Expansion ROM at 80020000 [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Bad kernel:
00:0a.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 PRO]
(rev 01) (prog-if 00 [VGA])
Subsystem: PC Partner Limited Unknown device 0250
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 128 (2000ns min)
Interrupt: pin A routed to IRQ 16
Region 0: Memory at 180000000 (32-bit, prefetchable) [size=128M]
Region 1: I/O ports at 1000 [size=256]
Region 2: Memory at <ignored> (32-bit, non-prefetchable)
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
=> Region 2 is not detected with our kernel, this later break things like
radeonfb initialization.
--
Grüsse / regards,
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization
P.S. I tested both pci slots of my board and both behave the same
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