[ECOS] ixp425 pci accesses crash in redboot

Daniel Nilsson gnuffel@gmail.com
Wed Sep 30 16:11:00 GMT 2009

I am using a IXP425 and a custom PCI target device,

The device enumeration and configuration all go well in redboot, but
sometimes (one in 200 reboots or so) I get a data abort exception that
ends up in the GDB stubs when I try to read from the PCI device using
PCI Memory Window transactions (reading/writing to/from
(0x49000000+offset)). I I get past this stage, the unit will stay up
forever happily serving PCI access. Only the reboots are dangerous.

When this happens, I have used gdb to read the pci configuration
parameters from the PCI target controller (0xC0000000 ->), and all is
as it should be (except that the PCI fatal error flag is raised) .
What I wonder is what can cause this behaviour, and how I should
handle it. Can this be caused by my PCI device doing an abort, by some
MMU/cache setting in the IXP425 or similar?

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