Linuxppc-embedded Digest, Vol 29, Issue 20

Aung Soe aung.aungkyawsoe at gmail.com
Thu Jan 18 01:22:13 EST 2007 

There is a good book called Linux Device Driver's from Oreilly

where it has a chapter/session explains how to probe PCI IRQs.

Ebook is free to be downloaded.

On 1/17/07, linuxppc-embedded-request at ozlabs.org
<linuxppc-embedded-request at ozlabs.org> wrote:
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>
> Today's Topics:
>
>    1. Re: PCI IRQ -MPC8540 (Kumar Gala)
>    2. Re: PCI IRQ -MPC8540 (Kumar Gala)
>    3. Problem getting machine check reset on 8245 (Jimmy Blair)
>    4. ram-disk root file system (Dan Wilson)
>    5. Who's the maintainer for the freescale MPC8349ITX board?
>       (Bruce_Leonard at selinc.com)
>    6. Re: ram-disk root file system (David H. Lynch Jr.)
>    7. Temac and Sysace for ML403 (alayrac)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 16 Jan 2007 19:29:01 -0600
> From: Kumar Gala <galak at kernel.crashing.org>
> Subject: Re: PCI IRQ -MPC8540
> To: agnel juni <junijoseph at yahoo.co.in>
> Cc: linuxppc-embedded at ozlabs.org
> Message-ID: <FC01A61F-56F4-4185-A199-1D3F05FAC470 at kernel.crashing.org>
> Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes;
> 	format=flowed
>
>
> On Jan 16, 2007, at 5:20 PM, agnel juni wrote:
>
> > Hello all:
> >
> > I would like to understand if there is a way to program the PCI
> > interrupt pin register of MPC8540. I did look for this in the
> > datasheet, but couldn't find any positive answer.
> >
> > Currently, I am working in a set-up where MPC8540 is an agent,
> > plugged into the PC host.
> > I couldn't get an IRQ for the card when plugged in some PCI slots,
> > whereas in one of the slots I do see a non-zero value.
> >
> > It would be great if you could help me understand the issue.
> >
> > I am sorry if the question is inapporpriate in the group. I am
> > desperate to solve the issue.
> >
> > Thanks for any help.
>
> You need to find out how the PCI edge interrupts are wired on you
> board than we can talk about how to generate an interrupt based on
> that.  I'd guess IRQ_OUT is wired to INTA, but it would be good to
> verify that.
>
> - k
>
> > J.Joseph
> >
> > ----- Original Message ----
> > From: Kumar Gala <galak at kernel.crashing.org>
> > To: Wang Matthew-R59995 <Qi.W at freescale.com>
> > Cc: linuxppc-embedded at ozlabs.org
> > Sent: Wednesday, 18 October, 2006 6:54:24 PM
> > Subject: Re: Linuxppc-embedded Digest, Vol 26, Issue 36
> >
> >
> > On Oct 18, 2006, at 8:10 PM, Wang Matthew-R59995 wrote:
> >
> > > Hi Kumar,
> > >
> > > Actually I do many trials about it. Vxwerks Bootrom is smaller than
> > > U-Boot. The key difference between Bootrom and U-boot is that some
> > > source code of Bootrom is invisible to the users.
> > >
> > > Actually the rfi instruction which I point out is the first rfi
> > > instruction of Linux PowerPC bringup.
> > >
> > > Before that, it's TLB entry invalidation and temp TLB entry mapping.
> > >
> > > I check MMU setting carefully before coming Linux Kernel.
> > >
> > > I just want to know if other guys met similar scenario like me. I
> > > don't
> > > need the precise answer, just overall suggestion about it because I
> > > understand that not everyone has the same bootloader of mine, that
> > > bootloader is actually a customized bootloader.
> >
> > I understand that, thus I was asking what exact problem you were
> > seeing to try and help.
> >
> > > Anyway thank you.
> > >
> > > R9 point to LR register, mask the high 20 bit of r9 and send to r7,
> > > and
> > > then add 24, which means stride 6 instructions for rfi instruction
> > > execution.
> > >
> > > Of course, rfi can switch the TLB entry, both the previous TLB
> > > entry and
> > > the temp TLB entry point to the same physical address.
> > >
> > > I've checked it.
> >
> > I know what the code does, I wrote it :)
> >
> > - kumar
> >
> >
> >
> > _______________________________________________
> > Linuxppc-embedded mailing list
> > Linuxppc-embedded at ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> >
> >
> > Here?s a new way to find what you're looking for - Yahoo! Answers
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 16 Jan 2007 19:56:20 -0600
> From: Kumar Gala <galak at kernel.crashing.org>
> Subject: Re: PCI IRQ -MPC8540
> To: agnel juni <junijoseph at yahoo.co.in>
> Cc: "linuxppc-embedded at ozlabs.org \(\(\(\(E-Mail\)\)\)\)"
> 	<linuxppc-embedded at ozlabs.org>
> Message-ID: <5C902FB2-CF5C-466A-B7AF-8D0B4BFA1A25 at kernel.crashing.org>
> Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes;
> 	format=flowed
>
> What kinda of interrupt do you want on IRQ_OUT/INTA?
>
> - k
>
> On Jan 16, 2007, at 7:54 PM, agnel juni wrote:
>
> > Yes IRQ_OUT is wired to INTA.
> >
> > Could you please advise on how to generate interrupt for this.
> >
> > Thanks
> > J-
> >
> > ----- Original Message ----
> > From: Kumar Gala <galak at kernel.crashing.org>
> > To: agnel juni <junijoseph at yahoo.co.in>
> > Cc: linuxppc-embedded at ozlabs.org
> > Sent: Tuesday, 16 January, 2007 5:29:01 PM
> > Subject: Re: PCI IRQ -MPC8540
> >
> >
> > On Jan 16, 2007, at 5:20 PM, agnel juni wrote:
> >
> > > Hello all:
> > >
> > > I would like to understand if there is a way to program the PCI
> > > interrupt pin register of MPC8540. I did look for this in the
> > > datasheet, but couldn't find any positive answer.
> > >
> > > Currently, I am working in a set-up where MPC8540 is an agent,
> > > plugged into the PC host.
> > > I couldn't get an IRQ for the card when plugged in some PCI slots,
> > > whereas in one of the slots I do see a non-zero value.
> > >
> > > It would be great if you could help me understand the issue.
> > >
> > > I am sorry if the question is inapporpriate in the group. I am
> > > desperate to solve the issue.
> > >
> > > Thanks for any help.
> >
> > You need to find out how the PCI edge interrupts are wired on you
> > board than we can talk about how to generate an interrupt based on
> > that.  I'd guess IRQ_OUT is wired to INTA, but it would be good to
> > verify that.
> >
> > - k
> >
> > > J.Joseph
> > >
> > > ----- Original Message ----
> > > From: Kumar Gala <galak at kernel.crashing.org>
> > > To: Wang Matthew-R59995 <Qi.W at freescale.com>
> > > Cc: linuxppc-embedded at ozlabs.org
> > > Sent: Wednesday, 18 October, 2006 6:54:24 PM
> > > Subject: Re: Linuxppc-embedded Digest, Vol 26, Issue 36
> > >
> > >
> > > On Oct 18, 2006, at 8:10 PM, Wang Matthew-R59995 wrote:
> > >
> > > > Hi Kumar,
> > > >
> > > > Actually I do many trials about it. Vxwerks Bootrom is smaller
> > than
> > > > U-Boot. The key difference between Bootrom and U-boot is that some
> > > > source code of Bootrom is invisible to the users.
> > > >
> > > > Actually the rfi instruction which I point out is the first rfi
> > > > instruction of Linux PowerPC bringup.
> > > >
> > > > Before that, it's TLB entry invalidation and temp TLB entry
> > mapping.
> > > >
> > > > I check MMU setting carefully before coming Linux Kernel.
> > > >
> > > > I just want to know if other guys met similar scenario like me. I
> > > > don't
> > > > need the precise answer, just overall suggestion about it
> > because I
> > > > understand that not everyone has the same bootloader of mine, that
> > > > bootloader is actually a customized bootloader.
> > >
> > > I understand that, thus I was asking what exact problem you were
> > > seeing to try and help.
> > >
> > > > Anyway thank you.
> > > >
> > > > R9 point to LR register, mask the high 20 bit of r9 and send to
> > r7,
> > > > and
> > > > then add 24, which means stride 6 instructions for rfi instruction
> > > > execution.
> > > >
> > > > Of course, rfi can switch the TLB entry, both the previous TLB
> > > > entry and
> > > > the temp TLB entry point to the same physical address.
> > > >
> > > > I've checked it.
> > >
> > > I know what the code does, I wrote it :)
> > >
> > > - kumar
> > >
> > >
> > >
> > > _______________________________________________
> > > Linuxppc-embedded mailing list
> > > Linuxppc-embedded at ozlabs.org
> > > https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> > >
> > >
> > > Here?s a new way to find what you're looking for - Yahoo! Answers
> >
> >
> >
> > Here?s a new way to find what you're looking for - Yahoo! Answers
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 16 Jan 2007 17:53:47 -0800
> From: Jimmy Blair <blueskyjb at verizon.net>
> Subject: Problem getting machine check reset on 8245
> To: linuxppc-embedded at ozlabs.org
> Message-ID: <45AD81AB.4010709 at verizon.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I implemented do_reset in Linux 2.6 using the
> reset method of U-Boot -- turn off the MMU and write
> to an invalid address.  Sometimes I the desired reboot.
> If I change the code a bit (e.g. put a 'nop' just ahead
> of turning off the MMU), I'll get an "Invalid floating
> point instruction" exception.  How is that possible??
> I didn't thing printk shouldn't would work if the MMU is turned off.
> Has anybody seen anything like this?? Thanks!
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 16 Jan 2007 21:02:05 -0800
> From: "Dan Wilson" <dwilson at dslextreme.com>
> Subject: ram-disk root file system
> To: linuxppc-embedded at ozlabs.org
> Message-ID: <200701162102050578.1213ACC0 at smtp.dslextreme.com>
> Content-Type: text/plain; charset="ISO-8859-1"
>
> We are attempting to use an initrd ram-disk as the permanent root file
> system for a MPC8541-based system.
>
> We are using ELDK 4 to cross-compile, and are running linux 2.6.15 kernel,
> with u-boot 1.1.6 as our bootloader.
>
> I built an initrd file system, compressed it, then ran mkimage against it,
> and it seems to be successfully loaded by u-boot, and linux sees the initrd
> file and claims to have mounted it.  However, it then reports that it is
> unable to find any files on the mounted root file system, as shown in the
> log below.  I added some additional diagnostics to show what the error codes
> were, and what was happening, but do not understand what I might have done
> wrong.  If I boot linux from an NFS system or from compact flash, I am able
> to mount the image and see all the files, so I believe the initrd file
> system was created correctly.
>
> Here's the trace.  Any help or pointers that anyone can give will be greatly
> appreciated!
>
> Thanks,
> Dan.
>
> Speed: 100, half duplex
> Using TSEC0 device
> TFTP from server 10.0.80.16; our IP address is 10.0.55.91
> Filename 'dw_eldk'.
> Load address: 0x4000000
> Loading: #################################################################
>           #################################################################
>           #################################################################
>           ###############################
> done
> Bytes transferred = 1154111 (119c3f hex)
> Speed: 100, half duplex
> Using TSEC0 device
> TFTP from server 10.0.80.16; our IP address is 10.0.55.91
> Filename 'fm2224ep_initrd.uboot'.
> Load address: 0x4200000
> Loading: #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           #################################################################
>           ####################################
> done
> Bytes transferred = 5840574 (591ebe hex)
> ## Booting image at 04000000 ...
>     Image Name:   Linux-2.6.15
>     Image Type:   PowerPC Linux Kernel Image (gzip compressed)
>     Data Size:    1154047 Bytes =  1.1 MB
>     Load Address: 00000000
>     Entry Point:  00000000
>     Verifying Checksum ... OK
>     Uncompressing Kernel Image ... OK
> ## Loading RAMDisk Image at 04200000 ...
>     Image Name:   FM2224EP Ramdisk Image
>     Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
>     Data Size:    5840510 Bytes =  5.6 MB
>     Load Address: 00000000
>     Entry Point:  00000000
>     Verifying Checksum ... OK
>     Loading Ramdisk to 1f92c000, end 1febde7e ... OK
> Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
> Linux version 2.6.15 (dwilson at washington) (gcc version 4.0.0 (DENX ELDK
> 4.0 4.0.0)) #6 Tue Jan 16 15:00:18 PST 2007
> fm2224ep_setup_arch
> CDS Version = f0 in PCI slot 1
> Built 1 zonelists
> Kernel command line: root=/dev/ram
> ip=10.0.55.91:10.0.80.21:10.0.0.254:255.255.0.0:FM2224EP_67:eth0
> console=ttyS0,9600
> nfsroot=10.0.80.21:/vol/local/common/kirkwood/hosts/eldk-test,v3,tcp rw
> init=/bin/ash
> OpenPIC Version 1.2 (1 CPUs and 60 IRQ sources) at fcfb8000
> PID hash table entries: 4096 (order: 12, 65536 bytes)
> Warning: real time clock seems stuck!
> Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
> Memory: 510976k available (1880k kernel code, 512k data, 136k init, 0k
> highmem)
> Mount-cache hash table entries: 512
> populate_roots calling unpack_to_roots: start = c0257000, end=c0257085,
> len=85
> checking if image is initramfs...<3>image check, start=df92c000,
> end=dfebde7e, err=c01dae84
> it isn't (no cpio magic); looks like an initrd
> wasn't initramfs (no cpio magic), opening /initrd.image, fd=0
> Freeing initrd memory: 5703k freed
> NET: Registered protocol family 16
> PCI: Probing PCI hardware
> Generic PHY: Registered new driver
> JFFS2 version 2.2. (NAND) (C) 2001-2003 Red Hat, Inc.
> io scheduler noop registered
> io scheduler anticipatory registered
> io scheduler deadline registered
> io scheduler cfq registered
> Generic RTC Driver v1.07
> Serial: 8250/16550 driver $Revision: #1 $ 4 ports, IRQ sharing disabled
> serial8250.0: ttyS0 at MMIO 0xe0004500 (irq = 90) is a 16550A
> serial8250.0: ttyS1 at MMIO 0xe0004600 (irq = 90) is a 16550A
> RAMDISK driver initialized: 16 RAM disks of 32768K size 1024 blocksize
> loop: loaded (max 8 devices)
> Gianfar MII Bus: probed
> eth0: Gianfar Ethernet Controller Version 1.2, 00:15:ed:00:09:41
> eth0: Running with NAPI enabled
> eth0: 256/256 RX/TX BD ring size
> eth1: Gianfar Ethernet Controller Version 1.2, 07:de:29:00:07:de
> eth1: Running with NAPI enabled
> eth1: 256/256 RX/TX BD ring size
> Marvell 88E1101: Registered new driver
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
> IDE phys mem : f0000000...f001ffff (size 0001ffff)
> IDE virt base: 0xe1080000
> CSR virt base: 0xe1100000
> vector: 0x80c40072
> port: 0xe1080002 => 0x00
> port: 0xe1080007 => 0x00
> port: 0xe108000b => 0x00
> port: 0xe108000f => 0x00
> port: 0xe1080013 => 0x00
> port: 0xe1080017 => 0x00
> port: 0xe108001b => 0xE0
> port: 0xe108001f => 0x50
> port: 0xe109001b => 0x50
> port: 0xe1080000 => 0xF0
> hda: SanDisk SDCFB-1024, CFA DISK drive
> ide0 at 0xe1080002-0xe1080009,0xe109001b on irq 114
> hda: max request size: 128KiB
> hda: 2001888 sectors (1024 MB) w/1KiB Cache, CHS=1986/16/63
> hda: cache flushes not supported
>   hda: unknown partition table
> i2c /dev entries driver
> NET: Registered protocol family 2
> IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
> TCP established hash table entries: 131072 (order: 7, 524288 bytes)
> TCP bind hash table entries: 65536 (order: 6, 262144 bytes)
> TCP: Hash tables configured (established 131072 bind 65536)
> TCP reno registered
> TCP bic registered
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> IP-Config: Complete:
>        device=eth0, addr=10.0.55.91, mask=255.255.0.0, gw=10.0.0.254,
>       host=FM2224EP_67, domain=, nis-domain=(none),
>       bootserver=10.0.80.21, rootserver=10.0.80.21, rootpath=
> init: ramdisk_execute_command = /init
> loading ramdisk image initrd.image
> RAMDISK: Compressed image found at block 0
> EXT2-fs warning: checktime reached, running e2fsck is recommended
> VFS: Mounted root (ext2 filesystem).
> Freeing unused kernel memory: 136k init
> run_init_process trying to exec /bin/ash
> back from execve, errno=2
> Failed to execute /bin/ash.  Attempting defaults...
> run_init_process trying to exec /sbin/init
> back from execve, errno=14
> run_init_process trying to exec /etc/init
> back from execve, errno=14
> run_init_process trying to exec /bin/init
> back from execve, errno=14
> run_init_process trying to exec /bin/sh
> back from execve, errno=14
> Kernel panic - not syncing: No init found.  Try passing init= option to
> kernel.
>   <0>Rebooting in 180 seconds..<6>phy0:0: Link is Up - 100/Half
>
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 16 Jan 2007 22:27:36 -0800
> From: Bruce_Leonard at selinc.com
> Subject: Who's the maintainer for the freescale MPC8349ITX board?
> To: linuxppc-embedded at ozlabs.org
> Message-ID:
> 	<OFF988DBDB.9E50EDE1-ON88257266.0023381C-88257266.00237CB3 at selinc.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> I'm sorry if this is a stupid question, but I can't figure it out from
> anything in the source.  I don't want to clutter up the mailing list with
> newbie questions so I'd like to get in touch with the person who did the
> linux/u-boot port for the MPC8349ITX board and take the discussion off
> line.
>
> Thanks for the help.
>
> Bruce Leonard
> Schweitzer Engineering Labs
> Pullman, WA USA
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 17 Jan 2007 02:54:02 -0500
> From: "David H. Lynch Jr." <dhlii at dlasys.net>
> Subject: Re: ram-disk root file system
> To: Dan Wilson <dwilson at dslextreme.com>
> Cc: linuxppc-embedded at ozlabs.org
> Message-ID: <45ADD61A.7020005 at dlasys.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Dan Wilson wrote:
> > We are attempting to use an initrd ram-disk as the permanent root file
> system for a MPC8541-based system.
> >
> > We are using ELDK 4 to cross-compile, and are running linux 2.6.15 kernel,
> with u-boot 1.1.6 as our bootloader.
> >
> > I built an initrd file system, compressed it, then ran mkimage against it,
> and it seems to be successfully loaded by u-boot, and linux sees the initrd
> file and claims to have mounted it.  However, it then reports that it is
> unable to find any files on the mounted root file system, as shown in the
> log below.  I added some additional diagnostics to show what the error codes
> were, and what was happening, but do not understand what I might have done
> wrong.  If I boot linux from an NFS system or from compact flash, I am able
> to mount the image and see all the files, so I believe the initrd file
> system was created correctly.
>     I had similar problems with a permanent initramfs filesystem. It is
> possible your problem has nothing to do with your filesystem.
>
>     First, I presume the debugging you added was in init/main.c.
>           Before you attempt to exec init, you can add code to open
> anyfile that you want on the ramdisk. opening a file requires less
> things to be right than exec'ing and that may isolate your problem
> further. I beleive you can enable system call tracing and find out more
> about where things are going off the rails.
>           You can also write a trivial hello world - one that does not
> use any libraries and very little code, and see if you can exec that.
>
>     When you boot Linux NFS - are you using the same linux kernel ?
>
>
>
>
> --
> Dave Lynch 					  	    DLA Systems
> Software Development:  				         Embedded Linux
> 717.627.3770 	       dhlii at dlasys.net 	  http://www.dlasys.net
> fax: 1.253.369.9244 			           Cell: 1.717.587.7774
> Over 25 years' experience in platforms, languages, and technologies too
> numerous to list.
>
> "Any intelligent fool can make things bigger and more complex... It takes a
> touch of genius - and a lot of courage to move in the opposite direction."
> Albert Einstein
>
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 17 Jan 2007 15:02:51 +0100
> From: "alayrac" <christophe.alayrac at cresitt.com>
> Subject: Temac and Sysace for ML403
> To: <linuxppc-embedded at ozlabs.org>
> Message-ID: <000001c73a40$2df61b50$c900a8c0 at CRESITTLAB>
> Content-Type: text/plain;	charset="us-ascii"
>
> Ameet,
>
> I've a few problems to run Linux 2.6.17.1 on ML403 board following your
> tutoarial instrcutions.
>
> I've downloaded Linux 2.6.17.1 Kernel source from kernel.org, apply
> MVITSA TEMAC patches from PAULUS and then apply the sysace_after_temac
> patch.
> The Kernel compile properly if I do not include TEMAC and SYSACE. This
> kernel boot properly and ends with a kernel panic due to root file
> system not detected.
>
> Then If I try to include only SYSACE and EXT3 file support the kernel
> did not compile (XST_ASSERT functions not found.... in
> xilinx_sysace/adapter.c file)
> To compile without source code modification I need to include TEMAC in
> the kernel configuration.
>
> This Kernel boot properly, detect sysaxe (xsa: xsa1 xsa2) with a compact
> flash with two partitions but hangs just after
>
> [    3.631175]  xsa: xsa1 xsa2
> [    3.682436] tun: Universal TUN/TAP device driver, 1.6
> [    3.743219] tun: (C) 1999-2004 Max Krasnyansky <maxk at qualcomm.com>
> [    3.820309] Data machine check in kernel mode.
>
> If I try to add more kernel configurations based on BYU instructions
> (refered on your tutorial) then I only succeed to obtain a :
>
> Oops : Kernel access bad area sig : 11
>
> Error message
>
>
> The hardware is a design from scratch using EDK 8.2 SP2.
> TEMAC version is plb_temac v3.00a, hard-temac v3.00b
>
> I suspect the hardware but I'm not sure about that. Hardware compilation
> took a while on my computer so I would appreciate if you could tell me
> the temac version you have used to port Linux 2.6.17.1 with TEMAC and
> SYSACE.
>
> Furthermore if you have a .config file available for Kernel
> configuration it would help me, beacause I'm not familiar with kernel
> configuration.
>
> Regards
>
>
> CRESITT INDUSTRIE
> 12 Rue de Blois, BP6744
> 45067 ORLEANS Cedex 2
> Tel : 02.38.49.45.59
> Fax :02.38.49.45.55
> Email : christophe.alayrac at cresitt.com
> Web : http://www.cresitt.com
>
>
>
>
>
> ------------------------------
>
> _______________________________________________
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