Linux doesn't boot if USB is enabled

[IGOR LURI]

Hi all,

We have a mpc5200 Icecube board with u-boot 1.1.3 and linux 2.4.25 from Denx where linux boots with USB enabled. 

We also have a mpc5200liteB evaluation board with u-boot 1.1.4 and linux 2.4.25 from Denx. We have realized that when USB is enabled linux doen´t boot, it hungs after u-boot uncompresses linux image.

				=> usb reset
				(Re)start USB...
				USB:   scanning bus for devices... 1 USB Device(s) found
				       scanning bus for storage devices... 0 Storage Device(s) found
				=>run bootcmd
				BOOTP broadcast 1
				DHCP client bound to address 10.0.17.102
				Using FEC ETHERNET device
				TFTP from server 10.0.7.228; our IP address is 10.0.17.102
				Filename 'vmlinux.UBoot'.
				Load address: 0x500000
				Loading: #################################################################
				         #################################################################
				         #################################################################
				         #
				done
				Bytes transferred = 1000231 (f4327 hex)
				=> bootm 0x500000
				## Booting image at 00500000 ...
				   Image Name:   Linux-2.4.25-rthal5-TRACE
				   Created:      2006-05-11  15:08:31 UTC
				   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
				   Data Size:    1000167 Bytes = 976.7 kB
				   Load Address: 00000000
				   Entry Point:  00000000
				   Verifying Checksum ... OK
				   Uncompressing Kernel Image ... OK
				Memory BAT mapping: BAT2=256Mb, BAT3=0Mb, residual: 0Mb
				Linux version 2.4.25-rthal5-TRACE (igor at ILURI_LINUX) (gcc version 3.3.6) #301 jue may 11 17:08:00 CEST 2006
				On node 0 totalpages: 65536
				zone(0): 65536 pages.
				zone(1): 0 pages.
				zone(2): 0 pages.
				Kernel command line: root=/dev/nfs rw console=ttyS0 console=ttyS0 init=/sbin/init ip=on
				Console: colour dummy device 80x25
				Calibrating delay loop... 307.20 BogoMIPS
				Memory: 256012k available (1824k kernel code, 612k data, 96k init, 0k highmem)
				Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)


If we disable USB with the command 

				=> usb stop
				stopping USB..

linux boots as usual.

I don't found changes in USB part between u-boot 1.1.3 and u-boot 1.1.4. I have readen MPC5200 revision B chip errata and there is nothing about USB. But I have found  a  manual named  U-Boot Bootloader for MPL Single Board Computer that says the following:

	Warning: Please make sure to stop the USB subsystem before booting an OS. This can be done by
	adding the command usb stop to the variable bootcmd:

This board uses a ppc405 and also it has the same problem.


Someone knows why linux doesn't boot with USB enabled on a mpc5200liteB board? Is this a hardware  problem?Is a revision B chip errata? Or, a software problem?


Thanks in advance.


Igor Luri
R&D Software Department
Fagor Automation S. Coop.
P. O. Box 144
E-20500 Mondragón-Arrasate
Tel. 	++34 943 71 92 00 
	++34 943 71 92 01 (Ext. 44124)
Fax. 	++34 943 79 92 03
www.fagorautomation.com
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