Problem in PCI with MPC5200B

[Heiko Schocher]

Hello Ram,

On Wed, 7 Jun 2006 11:05:16 +0530 Ram Prasad H L wrote
> hi all,
> 	We are using a customised board which is based on
> 	the reference design of lite5200B. But our board is customised by adding
> 	a PCI-PCI Bridge on the primary bus. On the secondary bus we have added
> 	a DSP(DM642) along with 2 PCI slots, which are routed through
> 	bridge (PCI2250) to MPC5200B.
> 
> 	As far as software is concerned we are using "mpc5200_lite_K26-BSP-b30"
> 	BSP downloaded from freescale's website for lite5200B. This BSP has a
> 	u-boot-1.1.3 and linux kernel-2.6.11.7. As far as u-boot is concerned
> 	the PCI devices are allocated and assigned with proper resources (BAR's)
> 	which come under the range for Mem region(40000000 - 4fffffff) and I/O
> 	region (50000000 - 50ffffff). But during the boot process of linux we
> 	are getting the following errors:
> 
> 
> ****************************************************************************
> ***
> 	PCI: Probing PCI hardware
> 	PCI: Cannot allocate resource region 1 of PCI bridge 1
> 	PCI: bridge 1 resource 1 moved to 4ff00000..4fffffff
> 	PCI: Cannot allocate resource region 2 of PCI bridge 1
> 	PCI: bridge 1 resource 2 moved to 4fe00000..4fefffff
> 	PCI: Failed to allocate mem resource #0: 400000 @ 50000000 for 0000:01:08.0
> 	PCI: Failed to allocate mem resource #1: 800000 @ 50000000 for 0000:01:08.0
> 	PCI: Failed to allocate I/O resource #2: 10 @ 1000 for 0000:01:08.0
> 
> ****************************************************************************
> ****

I had a similar problem with a 2.4.25 Kernel. I get the following
errors:

PCI: Cannot allocate resource region 0 of device 00:1b.0
PCI: moved device 00:1b.0 resource 0 (200) to e0000000

I solved the problem by adding

hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);

at the end of the function mpc5xxx_find_bridges() in
arch/ppc/kernel/mpc5xxx_pci.c

I didnt looked in the 2.6.11.7 Kernel, but maybe this helps you!

Best regards
Heiko