From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from marmot.shef.ac.uk (marmot.shef.ac.uk [143.167.1.4]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id 822B167BDC for ; Mon, 2 Oct 2006 20:08:27 +1000 (EST) Message-ID: <4520E511.7080706@gmail.com> Date: Mon, 02 Oct 2006 11:08:17 +0100 From: Ameet Patil MIME-Version: 1.0 To: agnel juni Subject: Re: linux-2.6 system ACE driver - need help References: <20060921235929.70623.qmail@web8410.mail.in.yahoo.com> In-Reply-To: <20060921235929.70623.qmail@web8410.mail.in.yahoo.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , agnel juni wrote: > Jeff, > > I forgot to mention onething. > > The System ACE Base Address register is a 64-bit address. > > So we have done ioremap64, like > ioremap64(0x4E0000000ULL, remap_size); > > Could this be a cause for the segmentation fault we are seeing ???? > > Screen-dump from one of our trials. > > # mount -t msdos /dev/xsysace1 /mnt/sysace/ > swap_dup: Bad swap file entry 7c0ff1f0 > VM: killing process exe > swap_free: Bad swap file entry 6c0ff019 > swap_free: Bad swap file entry c80ff1ef > swap_free: Bad swap file entry a80ff1f3 > swap_free: Bad swap file entry d00ff1ef > > thanks > Junita > > > > */agnel juni /* wrote: > > Hi Jeff, > > Thanks for your reply. > > > Does it work for you in polling mode? If not, you probably have a > problem with the way you are accessing the system ace - cache, > endianess, byte alignment, etc. If it does work in polling, the usual > suspects are interrupt masking errors or some low level problems with > your IRQ signals. Since you know the size of a sector and the size of > the sysace buffers, how many interrupts do you get per sector read? Do > you see extras or not enough? > > I heard from Ameet Patil that this driver is not tested in > poilling mode and it failed when we tried also. > Thats when we moved to interrupt mode. > > I did check for the endianess...byte alignment etc.It looks ok to me. > > I am using a 64 MB flash. And the sector sice is 512K.When the > kernel boots up I see 128 interrupts getting registered. (I think > its from alloc_disk(16) function in adapter.c ) > > Seems like the driver has issues with completing the request. > > We are having issues while mouting the device. It is erratic, that > sometimes we are able to mount/list files, copy files. > > But sometimes the kernel crashes and gives a Ooops message like : > > /*********************************************************/ > > # ls /mnt/Oops: kernel access of bad area, sig: 11 [#1] > NIP: C00556B8 LR: C00557E4 CTR: 00000000 > REGS: dfec1e08 TRAP: 0300 Not tainted (2.6.16.2) > MSR: 00021000 CR: 22128828 XER: 00000000 > DAR: 30303030, DSISR: 00800000 > TASK = dff6c030[4] 'events/0' THREAD: dfec0000 > GPR00: 00100100 DFEC1EB8 DFF6C030 C0258C60 DFF7BE10 00000018 > DF4E9000 C0256D60 > GPR08: 30303030 00200200 DF4E9154 30303030 22128888 00100400 > 1FFB9700 00000000 > GPR16: 00000001 FFFFFFFF 00000000 007FFF00 1FFB3604 1FF63CE0 > 1FFCEF78 C01F0000 > GPR24: C0240000 00100100 C0240000 00000000 DFF7BE10 00000018 > 00000000 C0258C60 > NIP [C00556B8] free_block+0xa8/0x148 > LR [C00557E4] drain_array_locked+0x8c/0xd8 > Call Trace: > [DFEC1EB8] [DFCA9490] 0xdfca9490 (unreliable) > [DFEC1ED8] [C00557E4] drain_array_locked+0x8c/0xd8 > [DFEC1EF0] [C0056F80] cache_reap+0x74/0x18c > [DFEC1F28] [C002B578] run_workqueue+0x9c/0x110 > [DFEC1F48] [C002B6E4] worker_thread+0xf8/0x13c > [DFEC1FC0] [C002F6F0] kthread+0xf4/0x130 > [DFEC1FF0] [C000413C] kernel_thread+0x44/0x60 > Instruction dump: > 7cfbfa14 3c000010 80e70014 3d2a4000 60000100 5529c9f4 7d295a14 > 80c9001c > 3d200020 61290200 81060004 81660000 <91680000> 910b0004 3966001c > 90060000 > BUG: events/0/4, lock held at task exit time! > [c01f5d60] {cache_chain_mutex} > .. held by: events/0: 4 [dff6c030, 110] > ... acquired at: cache_reap+0x1c/0x18c > /*******************************************************************/ > > > We are able to do this after modiifying the file > xsysace_compactflash.c and xsysace_intr.c to reset the > controller( It was commented out by applying the patch). > > The data in the CF looks sane. > > Please advise. > > Thanks for your help. > > > Thanks > Junita > > . > > Does it work for you in polling mode? If not, you probably have a > problem with the way you are accessing the system ace - cache, > endianess, byte alignment, etc. If it does work in polling, > the usual > suspects are interrupt masking errors or some low level > problems with > your IRQ signals. Since you know the size of a sector and the > size of > the sysace buffers, how many interrupts do you get per sector > read? Do > you see extras or not enough? > > > > > > > We are able to mount the CF, but it is very inconsistent. > > Dump the sector data to the screen that you are reading from > the CF. > Especially look at the results from the initial identify > command to > verify that they make sense, and because that is the easiest > to check. > > > Same is the case with fdisk command. When it fails,we get > errors which you could see in the screen-dump below. > > Are we missing to apply the right patch? Please let us know your > > inputs to go forward. > > Looking forwards for your reply. > > > > > # mount -t msdos /dev/xsysace /root/cf > > Shouldn't this be /dev/xsysace1? You want to mount a partition > not the > entire block device. > > > -- > Jeff Angielski > The PTR Group > > > ------------------------------------------------------------------------ > Find out what India is talking about on - Yahoo! Answers India > > > Send FREE SMS to your friend's mobile from Yahoo! Messenger > Version 8. Get it NOW > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > > > ------------------------------------------------------------------------ > Find out what India is talking about on - Yahoo! Answers India > > Send FREE SMS to your friend's mobile from Yahoo! Messenger Version 8. > Get it NOW > > > ------------------------------------------------------------------------ > > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded@ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded Sorry Junita, I am busy with something else at the moment... hard deadline! Haven't checked my code yet to give you any feedback. Sorry! -Ameet