What is the application you are using and could you turn the musb driver debug options? You can try it by echo "D 3" > /proc/driver/musb_hdrc (Check if MUSB_DEBUG is enabled). This should give more helpful messages. >-----Original Message----- >From: linux-omap-open-source-bounces@xxxxxxxxxxxxxx [mailto:linux-omap-open- >source-bounces@xxxxxxxxxxxxxx] On Behalf Of SUBHRANIL CHOUDHURY >Sent: Wednesday, July 30, 2008 5:50 PM >To: Gadiyar, Anand >Cc: linux-omap-open-source@xxxxxxxxxxxxxx >Subject: Re: USB driver issue > >hi, >I am using Mistral OMAP3430 OSK2.1 board. It is the USB OTG port. >The Philips tranciever ISP1504. >I am enabling the EHCI and OHCI in the kernel menuconfig. > >This was the error print i was getting: > >Unable to handle kernel NULL pointer dereference at virtual address 00000000 >pgd = c54d8000 >[00000000] *pgd=81401031, *pte=00000000, *ppte=00000000 >Internal error: Oops: 817 [#1] >Modules linked in: >CPU: 0 Not tainted (2.6.22.18-omap3 #29) >PC is at consistent_sync+0x40/0xa4 >LR is at usb_hcd_submit_urb+0x7b0/0x8b4 >pc : [<c00315ac>] lr : [<c02307e0>] psr: 20000013 >sp : c1403c48 ip : c1403c58 fp : c1403c54 >r10: ffff8003 r9 : 00000020 r8 : 00000020 >r7 : c483dc20 r6 : c0569000 r5 : c23c040c r4 : ff2d2000 >r3 : 00000000 r2 : 00000002 r1 : ff2dba38 r0 : ff2d2000 >Flags: nzCv IRQs on FIQs on Mode SVC_32 Segment user >Control: 00c5387f Table: 854d8018 DAC: 00000015 > >Do you get some clue from this about what is happening? > > > > >On Wed, Jul 30, 2008 at 5:35 PM, Gadiyar, Anand <gadiyar@xxxxxx> wrote: > >> > Hi all, >> > I am trying to validate the USB driver on OMAP3430 with the >> > 2.6.22.18kernel. I am facing problems in the process while trying to >> > do a USB transfer with DMA enabled. >> > The apllication is breaking in a function called >> > consistent_sync. The error message is like "Unable to handle kernel Null >> pointer". >> >> Which board are you using? Which is the USB port - EHCI/OHCI/OTG? >> >> Assuming it is the USB OTG port (because that is the only one where you >> can enable or disable DMA), what is the transceiver being used on the port? >> >> >> > The issue is same with both OHCI and EHCI controller. And the >> > issue is not coming if i disable DMA. >> >> I don't think you have control over DMA disabling with the OHCI/EHCI >> controller. Are you sure you are using the OHCI/EHCI controller? >> >> The "Unable to handle kernel Null pointer" message comes with some more >> data. >> We won't be able to help you out without the rest of the log, but the >> answers to >> questions above are essential before we move on to this. >> >> > >> > Has anyone tried USB packet transfer with DMA enabled? Please >> > let me know. >> > >> > Regards, >> > Subhro >> >_______________________________________________ >Linux-omap-open-source mailing list >Linux-omap-open-source@xxxxxxxxxxxxxx >http://linux.omap.com/mailman/listinfo/linux-omap-open-source -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
