Re: Oops in IDE probing on ppc_440 when PCI is enabled in strapping

On Mon, 2009-09-14 at 15:08 +0200, Ludo Van Put wrote:

2009/9/14 Josh Boyer [off-list ref]:

quoted

On Mon, Sep 14, 2009 at 02:36:15PM +0200, Ludo Van Put wrote:

quoted

Hi,

we're working with a PPC440GX on a board that has a.o. a compact flash slot.
We had the PCI subsystem of the ppc disabled in strapping for quite a while,
until we wanted to start using it.
However, when we enabled PCI in the strapping and in the (patched 2.6.10)

2.6.10?  Really?  If that is truly the case, you probably aren't going to get
a whole lot of help from the list, since that kernel is pretty ancient.

I can only acknowledge that, but we're stuck to that kernel for now...

quoted

quoted

kernel configuration, we triggered an oops when probing for IDE devices (to
read out the first 512 bytes of the CF). I can see that the ioremap64 call
in the driver code for our CF returns a different address (compared to PCI
disabled in strapping), but using this address later on for accessing the CF
goes wrong.

Posting the oops output would perhaps help.  Or maybe not.

josh

Here it goes, you never know:

Oops: kernel access of bad area, sig: 11 [#1]
PREEMPT
NIP: C0148050 LR: C013BC64 SP: C07CFEA0 REGS: c07cfdf0 TRAP: 0300    Not tainted
MSR: 00021000 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 00
DAR: E3093000, DSISR: 00000000
TASK = c07cdb70[1] 'swapper' THREAD: c07ce000
Last syscall: 120
GPR00: 00000000 C07CFEA0 C07CDB70 E3093000 DFE829FE 00000100 C01184E8 C021B270
GPR08: C0220000 C02D0F60 C07CDEF8 C07CDEF8 00000000 70000000 1FFF6400 00000001
GPR16: 00000001 FFFFFFFF 1FFF06C0 00000000 00000001 C0220000 C0280000 00029000
GPR24: 00000000 C02D0F60 C01F0000 C0148040 00000080 00000000 DFE82A00 C02D0FF0
NIP [c0148050] ide_insw+0x10/0x24
LR [c013bc64] ata_input_data+0x74/0x114
Call backtrace:
 c013e6a4 try_to_identify+0x2ec/0x5ec
 c013eaa8 do_probe+0x104/0x304
 c013f0c4 probe_hwif+0x358/0x6c4
 c0140068 ideprobe_init+0xa8/0x1a0
 c02a4ef8 ide_generic_init+0x10/0x28
 c0001324 init+0xc4/0x244
 c0004254 kernel_thread+0x44/0x60
Kernel panic - not syncing: Attempted to kill init!
 <0>Rebooting in 180 seconds..


ide_insw is a asm routine to read in 16bit words and swap them. Copied
from arch/ppc/kernel/misc.S. Works fine when PCI is disabled.

Probably because ide_insw uses isnw which offsets everything from
_IO_BASE which changes value when you have a PCI bus with an IO space...
If your IDE isn't PCI IO space based you shouldn't use ide_insw but the
MMIO variants instead.

Ben.

KR, Ludo
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