Kernel panic with PCI EHCI on AMCC Sequoia

I haven't done any testing to track this down. I'm using the Denx 2.6.22
kernel with the on-chip setup fix on a PPC440EPx.

I have both the onboard controller and a PCI controller running, with
ehci-hcd loaded as a module. The onboard controller seems to be working
fine, and if I plug in a USB mass-storage key to the PCI controller,
that seems to work fine as well. But if I plug in a high-speed hub to
the PCI controller, I get an immediate kernel panic:

Oops: kernel access of bad area, sig: 11 [#1]
NIP: d106752c LR: d106786c CTR: 00000008
REGS: c028bcf0 TRAP: 0300   Not tainted  (2.6.22-ts-1-ppc)
MSR: 00021000 <ME>  CR: 28d12524  XER: 00000000
DAR: 0101000e, DSISR: 00000000
TASK = c026d9d0[0] 'swapper' THREAD: c028a000
GPR00: ff105104 c028bda0 c026d9d0 00000000 c0270de8 00000058 00000058
00012102 
GPR08: ff105104 00000000 00000000 ff105100 ffffffb5 00000000 0ffb3100
cf7f595c 
GPR16: 0000004d 0000026f 00000800 ffffffb9 000003fc 00000008 ff1073fc
000007ff 
GPR24: cf3323fc cf7f5800 00000000 00000000 ff105100 01010000 cf7f58b8
00000000 
NIP [d106752c] ehci_work+0x6a8/0x814 [ehci_hcd]
LR [d106786c] ehci_watchdog+0x98/0xd4 [ehci_hcd]
Call Trace:
[c028bda0] [d1067028] ehci_work+0x1a4/0x814 [ehci_hcd] (unreliable)
[c028bdf0] [d106786c] ehci_watchdog+0x98/0xd4 [ehci_hcd]
[c028be00] [c00228bc] run_timer_softirq+0xe4/0x198
[c028be40] [c001e4d0] __do_softirq+0x78/0xe4
[c028be70] [c0006534] do_softirq+0x54/0x58
[c028be80] [c001e228] irq_exit+0x48/0x58
[c028be90] [c0003464] timer_interrupt+0xa0/0x224
[c028bed0] [c00020bc] ret_from_except+0x0/0x18
[c028bf90] [c00092f4] cpu_idle+0xc0/0xd0
[c028bfb0] [c01fc9a8] rest_init+0x58/0x68
[c028bfc0] [c028c720] start_kernel+0x220/0x29c
[c028bff0] [c0000200] skpinv+0x1a8/0x1e4
Instruction dump:
4bfffb8c 39200006 4bffff94 801e00b4 7d3a4b78 74090800 57492036 7ca64a14 
7c0a4214 41820050 7cea402e 906b0004 <a01d000e> 893d0038 74e47000
7c090050 
Kernel panic - not syncing: Aiee, killing interrupt handler!
Rebooting in 180 seconds..

Any ideas?

Thanks,
Mike

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