On Sep 16, 2009, at 11:17 PM, Felix Radensky wrote:
Hi,
On my custom MPC8536 based board running 2.6.31 kernel
FPGA is connected via x2 PCI-E lane. FPGA is identified
during PCI scan and is visible via lspci.
0000:01:00.0 Class ff00: Altera Corporation Unknown device 0004 (rev
01)
Subsystem: Altera Corporation Unknown device 0004
Flags: fast devsel, IRQ 16
Memory at 98000000 (32-bit, non-prefetchable) [disabled]
[size=1M]
Capabilities: [50] Message Signalled Interrupts: Mask+ 64bit+
Queue=0/5 Enable-
Capabilities: [78] Power Management version 3
Capabilities: [80] Express Endpoint IRQ 0
Capabilities: [100] Virtual Channel
However when I attempt to access FPGA memory my mmapping it in
userspace the read hangs. The same happens in kernel space. Does it
happen because FPGA memory is marked as disabled, or because FPGA
code is doing something wrong ?
Can you access the device in u-boot? That would possible tell you if
the HW is functioning or not.
Another question is what can cause PCI device memory be marked as
disabled.
Good question, no idea how lspci decided to print [disabled]. Take a
look at lspci source and see :)
- k
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